/*
 * Copyright 2018 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

#include <linux/uaccess.h>

#include "dc.h"
#include "amdgpu.h"
#include "amdgpu_dm.h"
#include "amdgpu_dm_debugfs.h"
#include "dm_helpers.h"
#include "dmub/dmub_srv.h"
#include "resource.h"
#include "dsc.h"
#include "dc_link_dp.h"
#include "link_hwss.h"
#include "dc/dc_dmub_srv.h"

struct dmub_debugfs_trace_header {
        uint32_t entry_count;
        uint32_t reserved[3];
};

struct dmub_debugfs_trace_entry {
        uint32_t trace_code;
        uint32_t tick_count;
        uint32_t param0;
        uint32_t param1;
};

static inline const char *yesno(bool v)
{
        return v ? "yes" : "no";
}

/* parse_write_buffer_into_params - Helper function to parse debugfs write buffer into an array
 *
 * Function takes in attributes passed to debugfs write entry
 * and writes into param array.
 * The user passes max_param_num to identify maximum number of
 * parameters that could be parsed.
 *
 */
static int parse_write_buffer_into_params(char *wr_buf, uint32_t wr_buf_size,
                                          long *param, const char __user *buf,
                                          int max_param_num,
                                          uint8_t *param_nums)
{
        char *wr_buf_ptr = NULL;
        uint32_t wr_buf_count = 0;
        int r;
        char *sub_str = NULL;
        const char delimiter[3] = {' ', '\n', '\0'};
        uint8_t param_index = 0;

        *param_nums = 0;

        wr_buf_ptr = wr_buf;

        r = copy_from_user(wr_buf_ptr, buf, wr_buf_size);

                /* r is bytes not be copied */
        if (r >= wr_buf_size) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                return -EINVAL;
        }

        /* check number of parameters. isspace could not differ space and \n */
        while ((*wr_buf_ptr != 0xa) && (wr_buf_count < wr_buf_size)) {
                /* skip space*/
                while (isspace(*wr_buf_ptr) && (wr_buf_count < wr_buf_size)) {
                        wr_buf_ptr++;
                        wr_buf_count++;
                        }

                if (wr_buf_count == wr_buf_size)
                        break;

                /* skip non-space*/
                while ((!isspace(*wr_buf_ptr)) && (wr_buf_count < wr_buf_size)) {
                        wr_buf_ptr++;
                        wr_buf_count++;
                }

                (*param_nums)++;

                if (wr_buf_count == wr_buf_size)
                        break;
        }

        if (*param_nums > max_param_num)
                *param_nums = max_param_num;

        wr_buf_ptr = wr_buf; /* reset buf pointer */
        wr_buf_count = 0; /* number of char already checked */

        while (isspace(*wr_buf_ptr) && (wr_buf_count < wr_buf_size)) {
                wr_buf_ptr++;
                wr_buf_count++;
        }

        while (param_index < *param_nums) {
                /* after strsep, wr_buf_ptr will be moved to after space */
                sub_str = strsep(&wr_buf_ptr, delimiter);

                r = kstrtol(sub_str, 16, &(param[param_index]));

                if (r)
                        DRM_DEBUG_DRIVER("string to int convert error code: %d\n", r);

                param_index++;
        }

        return 0;
}

/* function description
 * get/ set DP configuration: lane_count, link_rate, spread_spectrum
 *
 * valid lane count value: 1, 2, 4
 * valid link rate value:
 * 06h = 1.62Gbps per lane
 * 0Ah = 2.7Gbps per lane
 * 0Ch = 3.24Gbps per lane
 * 14h = 5.4Gbps per lane
 * 1Eh = 8.1Gbps per lane
 *
 * debugfs is located at /sys/kernel/debug/dri/0/DP-x/link_settings
 *
 * --- to get dp configuration
 *
 * cat /sys/kernel/debug/dri/0/DP-x/link_settings
 *
 * It will list current, verified, reported, preferred dp configuration.
 * current -- for current video mode
 * verified --- maximum configuration which pass link training
 * reported --- DP rx report caps (DPCD register offset 0, 1 2)
 * preferred --- user force settings
 *
 * --- set (or force) dp configuration
 *
 * echo <lane_count>  <link_rate> > link_settings
 *
 * for example, to force to  2 lane, 2.7GHz,
 * echo 4 0xa > /sys/kernel/debug/dri/0/DP-x/link_settings
 *
 * spread_spectrum could not be changed dynamically.
 *
 * in case invalid lane count, link rate are force, no hw programming will be
 * done. please check link settings after force operation to see if HW get
 * programming.
 *
 * cat /sys/kernel/debug/dri/0/DP-x/link_settings
 *
 * check current and preferred settings.
 *
 */
static ssize_t dp_link_settings_read(struct file *f, char __user *buf,
                                 size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        const uint32_t rd_buf_size = 100;
        uint32_t result = 0;
        uint8_t str_len = 0;
        int r;

        if (*pos & 3 || size & 3)
                return -EINVAL;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
        if (!rd_buf)
                return 0;

        rd_buf_ptr = rd_buf;

        str_len = strlen("Current:  %d  0x%x  %d  ");
        snprintf(rd_buf_ptr, str_len, "Current:  %d  0x%x  %d  ",
                        link->cur_link_settings.lane_count,
                        link->cur_link_settings.link_rate,
                        link->cur_link_settings.link_spread);
        rd_buf_ptr += str_len;

        str_len = strlen("Verified:  %d  0x%x  %d  ");
        snprintf(rd_buf_ptr, str_len, "Verified:  %d  0x%x  %d  ",
                        link->verified_link_cap.lane_count,
                        link->verified_link_cap.link_rate,
                        link->verified_link_cap.link_spread);
        rd_buf_ptr += str_len;

        str_len = strlen("Reported:  %d  0x%x  %d  ");
        snprintf(rd_buf_ptr, str_len, "Reported:  %d  0x%x  %d  ",
                        link->reported_link_cap.lane_count,
                        link->reported_link_cap.link_rate,
                        link->reported_link_cap.link_spread);
        rd_buf_ptr += str_len;

        str_len = strlen("Preferred:  %d  0x%x  %d  ");
        snprintf(rd_buf_ptr, str_len, "Preferred:  %d  0x%x  %d\n",
                        link->preferred_link_setting.lane_count,
                        link->preferred_link_setting.link_rate,
                        link->preferred_link_setting.link_spread);

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

static ssize_t dp_link_settings_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        struct dc_link_settings prefer_link_settings;
        char *wr_buf = NULL;
        const uint32_t wr_buf_size = 40;
        /* 0: lane_count; 1: link_rate */
        int max_param_num = 2;
        uint8_t param_nums = 0;
        long param[2];
        bool valid_input = true;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
        if (!wr_buf)
                return -ENOSPC;

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                           (long *)param, buf,
                                           max_param_num,
                                           &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                kfree(wr_buf);
                DRM_DEBUG_DRIVER("user data not be read\n");
                return -EINVAL;
        }

        switch (param[0]) {
        case LANE_COUNT_ONE:
        case LANE_COUNT_TWO:
        case LANE_COUNT_FOUR:
                break;
        default:
                valid_input = false;
                break;
        }

        switch (param[1]) {
        case LINK_RATE_LOW:
        case LINK_RATE_HIGH:
        case LINK_RATE_RBR2:
        case LINK_RATE_HIGH2:
        case LINK_RATE_HIGH3:
                break;
        default:
                valid_input = false;
                break;
        }

        if (!valid_input) {
                kfree(wr_buf);
                DRM_DEBUG_DRIVER("Invalid Input value No HW will be programmed\n");
                return size;
        }

        /* save user force lane_count, link_rate to preferred settings
         * spread spectrum will not be changed
         */
        prefer_link_settings.link_spread = link->cur_link_settings.link_spread;
        prefer_link_settings.use_link_rate_set = false;
        prefer_link_settings.lane_count = param[0];
        prefer_link_settings.link_rate = param[1];

        dp_retrain_link_dp_test(link, &prefer_link_settings, false);

        kfree(wr_buf);
        return size;
}

/* function: get current DP PHY settings: voltage swing, pre-emphasis,
 * post-cursor2 (defined by VESA DP specification)
 *
 * valid values
 * voltage swing: 0,1,2,3
 * pre-emphasis : 0,1,2,3
 * post cursor2 : 0,1,2,3
 *
 *
 * how to use this debugfs
 *
 * debugfs is located at /sys/kernel/debug/dri/0/DP-x
 *
 * there will be directories, like DP-1, DP-2,DP-3, etc. for DP display
 *
 * To figure out which DP-x is the display for DP to be check,
 * cd DP-x
 * ls -ll
 * There should be debugfs file, like link_settings, phy_settings.
 * cat link_settings
 * from lane_count, link_rate to figure which DP-x is for display to be worked
 * on
 *
 * To get current DP PHY settings,
 * cat phy_settings
 *
 * To change DP PHY settings,
 * echo <voltage_swing> <pre-emphasis> <post_cursor2> > phy_settings
 * for examle, to change voltage swing to 2, pre-emphasis to 3, post_cursor2 to
 * 0,
 * echo 2 3 0 > phy_settings
 *
 * To check if change be applied, get current phy settings by
 * cat phy_settings
 *
 * In case invalid values are set by user, like
 * echo 1 4 0 > phy_settings
 *
 * HW will NOT be programmed by these settings.
 * cat phy_settings will show the previous valid settings.
 */
static ssize_t dp_phy_settings_read(struct file *f, char __user *buf,
                                 size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        char *rd_buf = NULL;
        const uint32_t rd_buf_size = 20;
        uint32_t result = 0;
        int r;

        if (*pos & 3 || size & 3)
                return -EINVAL;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
        if (!rd_buf)
                return -EINVAL;

        snprintf(rd_buf, rd_buf_size, "  %d  %d  %d\n",
                        link->cur_lane_setting.VOLTAGE_SWING,
                        link->cur_lane_setting.PRE_EMPHASIS,
                        link->cur_lane_setting.POST_CURSOR2);

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user((*(rd_buf + result)), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

static int dp_lttpr_status_show(struct seq_file *m, void *d)
{
        char *data;
        struct amdgpu_dm_connector *connector = file_inode(m->file)->i_private;
        struct dc_link *link = connector->dc_link;
        uint32_t read_size = 1;
        uint8_t repeater_count = 0;

        data = kzalloc(read_size, GFP_KERNEL);
        if (!data)
                return 0;

        dm_helpers_dp_read_dpcd(link->ctx, link, 0xF0002, data, read_size);

        switch ((uint8_t)*data) {
        case 0x80:
                repeater_count = 1;
                break;
        case 0x40:
                repeater_count = 2;
                break;
        case 0x20:
                repeater_count = 3;
                break;
        case 0x10:
                repeater_count = 4;
                break;
        case 0x8:
                repeater_count = 5;
                break;
        case 0x4:
                repeater_count = 6;
                break;
        case 0x2:
                repeater_count = 7;
                break;
        case 0x1:
                repeater_count = 8;
                break;
        case 0x0:
                repeater_count = 0;
                break;
        default:
                repeater_count = (uint8_t)*data;
                break;
        }

        seq_printf(m, "phy repeater count: %d\n", repeater_count);

        dm_helpers_dp_read_dpcd(link->ctx, link, 0xF0003, data, read_size);

        if ((uint8_t)*data == 0x55)
                seq_printf(m, "phy repeater mode: transparent\n");
        else if ((uint8_t)*data == 0xAA)
                seq_printf(m, "phy repeater mode: non-transparent\n");
        else if ((uint8_t)*data == 0x00)
                seq_printf(m, "phy repeater mode: non lttpr\n");
        else
                seq_printf(m, "phy repeater mode: read error\n");

        kfree(data);
        return 0;
}

static ssize_t dp_phy_settings_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        struct dc *dc = (struct dc *)link->dc;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 40;
        long param[3];
        bool use_prefer_link_setting;
        struct link_training_settings link_lane_settings;
        int max_param_num = 3;
        uint8_t param_nums = 0;
        int r = 0;


        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
        if (!wr_buf)
                return -ENOSPC;

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                           (long *)param, buf,
                                           max_param_num,
                                           &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                kfree(wr_buf);
                DRM_DEBUG_DRIVER("user data not be read\n");
                return -EINVAL;
        }

        if ((param[0] > VOLTAGE_SWING_MAX_LEVEL) ||
                        (param[1] > PRE_EMPHASIS_MAX_LEVEL) ||
                        (param[2] > POST_CURSOR2_MAX_LEVEL)) {
                kfree(wr_buf);
                DRM_DEBUG_DRIVER("Invalid Input No HW will be programmed\n");
                return size;
        }

        /* get link settings: lane count, link rate */
        use_prefer_link_setting =
                ((link->preferred_link_setting.link_rate != LINK_RATE_UNKNOWN) &&
                (link->test_pattern_enabled));

        memset(&link_lane_settings, 0, sizeof(link_lane_settings));

        if (use_prefer_link_setting) {
                link_lane_settings.link_settings.lane_count =
                                link->preferred_link_setting.lane_count;
                link_lane_settings.link_settings.link_rate =
                                link->preferred_link_setting.link_rate;
                link_lane_settings.link_settings.link_spread =
                                link->preferred_link_setting.link_spread;
        } else {
                link_lane_settings.link_settings.lane_count =
                                link->cur_link_settings.lane_count;
                link_lane_settings.link_settings.link_rate =
                                link->cur_link_settings.link_rate;
                link_lane_settings.link_settings.link_spread =
                                link->cur_link_settings.link_spread;
        }

        /* apply phy settings from user */
        for (r = 0; r < link_lane_settings.link_settings.lane_count; r++) {
                link_lane_settings.lane_settings[r].VOLTAGE_SWING =
                                (enum dc_voltage_swing) (param[0]);
                link_lane_settings.lane_settings[r].PRE_EMPHASIS =
                                (enum dc_pre_emphasis) (param[1]);
                link_lane_settings.lane_settings[r].POST_CURSOR2 =
                                (enum dc_post_cursor2) (param[2]);
        }

        /* program ASIC registers and DPCD registers */
        dc_link_set_drive_settings(dc, &link_lane_settings, link);

        kfree(wr_buf);
        return size;
}

/* function description
 *
 * set PHY layer or Link layer test pattern
 * PHY test pattern is used for PHY SI check.
 * Link layer test will not affect PHY SI.
 *
 * Reset Test Pattern:
 * 0 = DP_TEST_PATTERN_VIDEO_MODE
 *
 * PHY test pattern supported:
 * 1 = DP_TEST_PATTERN_D102
 * 2 = DP_TEST_PATTERN_SYMBOL_ERROR
 * 3 = DP_TEST_PATTERN_PRBS7
 * 4 = DP_TEST_PATTERN_80BIT_CUSTOM
 * 5 = DP_TEST_PATTERN_CP2520_1
 * 6 = DP_TEST_PATTERN_CP2520_2 = DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE
 * 7 = DP_TEST_PATTERN_CP2520_3
 *
 * DP PHY Link Training Patterns
 * 8 = DP_TEST_PATTERN_TRAINING_PATTERN1
 * 9 = DP_TEST_PATTERN_TRAINING_PATTERN2
 * a = DP_TEST_PATTERN_TRAINING_PATTERN3
 * b = DP_TEST_PATTERN_TRAINING_PATTERN4
 *
 * DP Link Layer Test pattern
 * c = DP_TEST_PATTERN_COLOR_SQUARES
 * d = DP_TEST_PATTERN_COLOR_SQUARES_CEA
 * e = DP_TEST_PATTERN_VERTICAL_BARS
 * f = DP_TEST_PATTERN_HORIZONTAL_BARS
 * 10= DP_TEST_PATTERN_COLOR_RAMP
 *
 * debugfs phy_test_pattern is located at /syskernel/debug/dri/0/DP-x
 *
 * --- set test pattern
 * echo <test pattern #> > test_pattern
 *
 * If test pattern # is not supported, NO HW programming will be done.
 * for DP_TEST_PATTERN_80BIT_CUSTOM, it needs extra 10 bytes of data
 * for the user pattern. input 10 bytes data are separated by space
 *
 * echo 0x4 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 0x99 0xaa > test_pattern
 *
 * --- reset test pattern
 * echo 0 > test_pattern
 *
 * --- HPD detection is disabled when set PHY test pattern
 *
 * when PHY test pattern (pattern # within [1,7]) is set, HPD pin of HW ASIC
 * is disable. User could unplug DP display from DP connected and plug scope to
 * check test pattern PHY SI.
 * If there is need unplug scope and plug DP display back, do steps below:
 * echo 0 > phy_test_pattern
 * unplug scope
 * plug DP display.
 *
 * "echo 0 > phy_test_pattern" will re-enable HPD pin again so that video sw
 * driver could detect "unplug scope" and "plug DP display"
 */
static ssize_t dp_phy_test_pattern_debugfs_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 100;
        long param[11] = {0x0};
        int max_param_num = 11;
        enum dp_test_pattern test_pattern = DP_TEST_PATTERN_UNSUPPORTED;
        bool disable_hpd = false;
        bool valid_test_pattern = false;
        uint8_t param_nums = 0;
        /* init with default 80bit custom pattern */
        uint8_t custom_pattern[10] = {
                        0x1f, 0x7c, 0xf0, 0xc1, 0x07,
                        0x1f, 0x7c, 0xf0, 0xc1, 0x07
                        };
        struct dc_link_settings prefer_link_settings = {LANE_COUNT_UNKNOWN,
                        LINK_RATE_UNKNOWN, LINK_SPREAD_DISABLED};
        struct dc_link_settings cur_link_settings = {LANE_COUNT_UNKNOWN,
                        LINK_RATE_UNKNOWN, LINK_SPREAD_DISABLED};
        struct link_training_settings link_training_settings;
        int i;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);
        if (!wr_buf)
                return -ENOSPC;

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                           (long *)param, buf,
                                           max_param_num,
                                           &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                kfree(wr_buf);
                DRM_DEBUG_DRIVER("user data not be read\n");
                return -EINVAL;
        }


        test_pattern = param[0];

        switch (test_pattern) {
        case DP_TEST_PATTERN_VIDEO_MODE:
        case DP_TEST_PATTERN_COLOR_SQUARES:
        case DP_TEST_PATTERN_COLOR_SQUARES_CEA:
        case DP_TEST_PATTERN_VERTICAL_BARS:
        case DP_TEST_PATTERN_HORIZONTAL_BARS:
        case DP_TEST_PATTERN_COLOR_RAMP:
                valid_test_pattern = true;
                break;

        case DP_TEST_PATTERN_D102:
        case DP_TEST_PATTERN_SYMBOL_ERROR:
        case DP_TEST_PATTERN_PRBS7:
        case DP_TEST_PATTERN_80BIT_CUSTOM:
        case DP_TEST_PATTERN_HBR2_COMPLIANCE_EYE:
        case DP_TEST_PATTERN_TRAINING_PATTERN4:
                disable_hpd = true;
                valid_test_pattern = true;
                break;

        default:
                valid_test_pattern = false;
                test_pattern = DP_TEST_PATTERN_UNSUPPORTED;
                break;
        }

        if (!valid_test_pattern) {
                kfree(wr_buf);
                DRM_DEBUG_DRIVER("Invalid Test Pattern Parameters\n");
                return size;
        }

        if (test_pattern == DP_TEST_PATTERN_80BIT_CUSTOM) {
                for (i = 0; i < 10; i++) {
                        if ((uint8_t) param[i + 1] != 0x0)
                                break;
                }

                if (i < 10) {
                        /* not use default value */
                        for (i = 0; i < 10; i++)
                                custom_pattern[i] = (uint8_t) param[i + 1];
                }
        }

        /* Usage: set DP physical test pattern using debugfs with normal DP
         * panel. Then plug out DP panel and connect a scope to measure
         * For normal video mode and test pattern generated from CRCT,
         * they are visibile to user. So do not disable HPD.
         * Video Mode is also set to clear the test pattern, so enable HPD
         * because it might have been disabled after a test pattern was set.
         * AUX depends on HPD * sequence dependent, do not move!
         */
        if (!disable_hpd)
                dc_link_enable_hpd(link);

        prefer_link_settings.lane_count = link->verified_link_cap.lane_count;
        prefer_link_settings.link_rate = link->verified_link_cap.link_rate;
        prefer_link_settings.link_spread = link->verified_link_cap.link_spread;

        cur_link_settings.lane_count = link->cur_link_settings.lane_count;
        cur_link_settings.link_rate = link->cur_link_settings.link_rate;
        cur_link_settings.link_spread = link->cur_link_settings.link_spread;

        link_training_settings.link_settings = cur_link_settings;


        if (test_pattern != DP_TEST_PATTERN_VIDEO_MODE) {
                if (prefer_link_settings.lane_count != LANE_COUNT_UNKNOWN &&
                        prefer_link_settings.link_rate !=  LINK_RATE_UNKNOWN &&
                        (prefer_link_settings.lane_count != cur_link_settings.lane_count ||
                        prefer_link_settings.link_rate != cur_link_settings.link_rate))
                        link_training_settings.link_settings = prefer_link_settings;
        }

        for (i = 0; i < (unsigned int)(link_training_settings.link_settings.lane_count); i++)
                link_training_settings.lane_settings[i] = link->cur_lane_setting;

        dc_link_set_test_pattern(
                link,
                test_pattern,
                DP_TEST_PATTERN_COLOR_SPACE_RGB,
                &link_training_settings,
                custom_pattern,
                10);

        /* Usage: Set DP physical test pattern using AMDDP with normal DP panel
         * Then plug out DP panel and connect a scope to measure DP PHY signal.
         * Need disable interrupt to avoid SW driver disable DP output. This is
         * done after the test pattern is set.
         */
        if (valid_test_pattern && disable_hpd)
                dc_link_disable_hpd(link);

        kfree(wr_buf);

        return size;
}

/*
 * Returns the DMCUB tracebuffer contents.
 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dmub_tracebuffer
 */
static int dmub_tracebuffer_show(struct seq_file *m, void *data)
{
        struct amdgpu_device *adev = m->private;
        struct dmub_srv_fb_info *fb_info = adev->dm.dmub_fb_info;
        struct dmub_debugfs_trace_entry *entries;
        uint8_t *tbuf_base;
        uint32_t tbuf_size, max_entries, num_entries, i;

        if (!fb_info)
                return 0;

        tbuf_base = (uint8_t *)fb_info->fb[DMUB_WINDOW_5_TRACEBUFF].cpu_addr;
        if (!tbuf_base)
                return 0;

        tbuf_size = fb_info->fb[DMUB_WINDOW_5_TRACEBUFF].size;
        max_entries = (tbuf_size - sizeof(struct dmub_debugfs_trace_header)) /
                      sizeof(struct dmub_debugfs_trace_entry);

        num_entries =
                ((struct dmub_debugfs_trace_header *)tbuf_base)->entry_count;

        num_entries = min(num_entries, max_entries);

        entries = (struct dmub_debugfs_trace_entry
                           *)(tbuf_base +
                              sizeof(struct dmub_debugfs_trace_header));

        for (i = 0; i < num_entries; ++i) {
                struct dmub_debugfs_trace_entry *entry = &entries[i];

                seq_printf(m,
                           "trace_code=%u tick_count=%u param0=%u param1=%u\n",
                           entry->trace_code, entry->tick_count, entry->param0,
                           entry->param1);
        }

        return 0;
}

/*
 * Returns the DMCUB firmware state contents.
 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dmub_fw_state
 */
static int dmub_fw_state_show(struct seq_file *m, void *data)
{
        struct amdgpu_device *adev = m->private;
        struct dmub_srv_fb_info *fb_info = adev->dm.dmub_fb_info;
        uint8_t *state_base;
        uint32_t state_size;

        if (!fb_info)
                return 0;

        state_base = (uint8_t *)fb_info->fb[DMUB_WINDOW_6_FW_STATE].cpu_addr;
        if (!state_base)
                return 0;

        state_size = fb_info->fb[DMUB_WINDOW_6_FW_STATE].size;

        return seq_write(m, state_base, state_size);
}

/*
 * Returns the current and maximum output bpc for the connector.
 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
 */
static int output_bpc_show(struct seq_file *m, void *data)
{
        struct drm_connector *connector = m->private;
        struct drm_device *dev = connector->dev;
        struct drm_crtc *crtc = NULL;
        struct dm_crtc_state *dm_crtc_state = NULL;
        int res = -ENODEV;
        unsigned int bpc;

        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        crtc = connector->state->crtc;
        if (crtc == NULL)
                goto unlock;

        drm_modeset_lock(&crtc->mutex, NULL);
        if (crtc->state == NULL)
                goto unlock;

        dm_crtc_state = to_dm_crtc_state(crtc->state);
        if (dm_crtc_state->stream == NULL)
                goto unlock;

        switch (dm_crtc_state->stream->timing.display_color_depth) {
        case COLOR_DEPTH_666:
                bpc = 6;
                break;
        case COLOR_DEPTH_888:
                bpc = 8;
                break;
        case COLOR_DEPTH_101010:
                bpc = 10;
                break;
        case COLOR_DEPTH_121212:
                bpc = 12;
                break;
        case COLOR_DEPTH_161616:
                bpc = 16;
                break;
        default:
                goto unlock;
        }

        seq_printf(m, "Current: %u\n", bpc);
        seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
        res = 0;

unlock:
        if (crtc)
                drm_modeset_unlock(&crtc->mutex);

        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);

        return res;
}

/*
 * Example usage:
 * Disable dsc passthrough, i.e.,: have dsc decoding at converver, not external RX
 *   echo 1 /sys/kernel/debug/dri/0/DP-1/dsc_disable_passthrough
 * Enable dsc passthrough, i.e.,: have dsc passthrough to external RX
 *   echo 0 /sys/kernel/debug/dri/0/DP-1/dsc_disable_passthrough
 */
static ssize_t dp_dsc_passthrough_set(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        long param;
        uint8_t param_nums = 0;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                           &param, buf,
                                           max_param_num,
                                           &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        aconnector->dsc_settings.dsc_force_disable_passthrough = param;

        kfree(wr_buf);
        return 0;
}

#ifdef CONFIG_DRM_AMD_DC_HDCP
/*
 * Returns the HDCP capability of the Display (1.4 for now).
 *
 * NOTE* Not all HDMI displays report their HDCP caps even when they are capable.
 * Since its rare for a display to not be HDCP 1.4 capable, we set HDMI as always capable.
 *
 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/hdcp_sink_capability
 *              or cat /sys/kernel/debug/dri/0/HDMI-A-1/hdcp_sink_capability
 */
static int hdcp_sink_capability_show(struct seq_file *m, void *data)
{
        struct drm_connector *connector = m->private;
        struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
        bool hdcp_cap, hdcp2_cap;

        if (connector->status != connector_status_connected)
                return -ENODEV;

        seq_printf(m, "%s:%d HDCP version: ", connector->name, connector->base.id);

        hdcp_cap = dc_link_is_hdcp14(aconnector->dc_link, aconnector->dc_sink->sink_signal);
        hdcp2_cap = dc_link_is_hdcp22(aconnector->dc_link, aconnector->dc_sink->sink_signal);


        if (hdcp_cap)
                seq_printf(m, "%s ", "HDCP1.4");
        if (hdcp2_cap)
                seq_printf(m, "%s ", "HDCP2.2");

        if (!hdcp_cap && !hdcp2_cap)
                seq_printf(m, "%s ", "None");

        seq_puts(m, "\n");

        return 0;
}
#endif

/*
 * Returns whether the connected display is internal and not hotpluggable.
 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/internal_display
 */
static int internal_display_show(struct seq_file *m, void *data)
{
        struct drm_connector *connector = m->private;
        struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
        struct dc_link *link = aconnector->dc_link;

        seq_printf(m, "Internal: %u\n", link->is_internal_display);

        return 0;
}

/* function description
 *
 * generic SDP message access for testing
 *
 * debugfs sdp_message is located at /syskernel/debug/dri/0/DP-x
 *
 * SDP header
 * Hb0 : Secondary-Data Packet ID
 * Hb1 : Secondary-Data Packet type
 * Hb2 : Secondary-Data-packet-specific header, Byte 0
 * Hb3 : Secondary-Data-packet-specific header, Byte 1
 *
 * for using custom sdp message: input 4 bytes SDP header and 32 bytes raw data
 */
static ssize_t dp_sdp_message_debugfs_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)

{
        int r;
        uint8_t data[36];
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dm_crtc_state *acrtc_state;
        uint32_t write_size = 36;

        if (connector->base.status != connector_status_connected)
                return -ENODEV;

        if (size == 0)
                return 0;

        acrtc_state = to_dm_crtc_state(connector->base.state->crtc->state);

        r = copy_from_user(data, buf, write_size);

        write_size -= r;

        dc_stream_send_dp_sdp(acrtc_state->stream, data, write_size);

        return write_size;
}

static ssize_t dp_dpcd_address_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        int r;
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;

        if (size < sizeof(connector->debugfs_dpcd_address))
                return -EINVAL;

        r = copy_from_user(&connector->debugfs_dpcd_address,
                        buf, sizeof(connector->debugfs_dpcd_address));

        return size - r;
}

static ssize_t dp_dpcd_size_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        int r;
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;

        if (size < sizeof(connector->debugfs_dpcd_size))
                return -EINVAL;

        r = copy_from_user(&connector->debugfs_dpcd_size,
                        buf, sizeof(connector->debugfs_dpcd_size));

        if (connector->debugfs_dpcd_size > 256)
                connector->debugfs_dpcd_size = 0;

        return size - r;
}

static ssize_t dp_dpcd_data_write(struct file *f, const char __user *buf,
                                 size_t size, loff_t *pos)
{
        int r;
        char *data;
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        uint32_t write_size = connector->debugfs_dpcd_size;

        if (!write_size || size < write_size)
                return -EINVAL;

        data = kzalloc(write_size, GFP_KERNEL);
        if (!data)
                return 0;

        r = copy_from_user(data, buf, write_size);

        dm_helpers_dp_write_dpcd(link->ctx, link,
                        connector->debugfs_dpcd_address, data, write_size - r);
        kfree(data);
        return write_size - r;
}

static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf,
                                 size_t size, loff_t *pos)
{
        int r;
        char *data;
        struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
        struct dc_link *link = connector->dc_link;
        uint32_t read_size = connector->debugfs_dpcd_size;

        if (!read_size || size < read_size)
                return 0;

        data = kzalloc(read_size, GFP_KERNEL);
        if (!data)
                return 0;

        dm_helpers_dp_read_dpcd(link->ctx, link,
                        connector->debugfs_dpcd_address, data, read_size);

        r = copy_to_user(buf, data, read_size);

        kfree(data);
        return read_size - r;
}

/* function: Read link's DSC & FEC capabilities
 *
 *
 * Access it with the following command (you need to specify
 * connector like DP-1):
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dp_dsc_fec_support
 *
 */
static int dp_dsc_fec_support_show(struct seq_file *m, void *data)
{
        struct drm_connector *connector = m->private;
        struct drm_modeset_acquire_ctx ctx;
        struct drm_device *dev = connector->dev;
        struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
        int ret = 0;
        bool try_again = false;
        bool is_fec_supported = false;
        bool is_dsc_supported = false;
        struct dpcd_caps dpcd_caps;

        drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
        do {
                try_again = false;
                ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
                if (ret) {
                        if (ret == -EDEADLK) {
                                ret = drm_modeset_backoff(&ctx);
                                if (!ret) {
                                        try_again = true;
                                        continue;
                                }
                        }
                        break;
                }
                if (connector->status != connector_status_connected) {
                        ret = -ENODEV;
                        break;
                }
                dpcd_caps = aconnector->dc_link->dpcd_caps;
                if (aconnector->port) {
                        /* aconnector sets dsc_aux during get_modes call
                         * if MST connector has it means it can either
                         * enable DSC on the sink device or on MST branch
                         * its connected to.
                         */
                        if (aconnector->dsc_aux) {
                                is_fec_supported = true;
                                is_dsc_supported = true;
                        }
                } else {
                        is_fec_supported = dpcd_caps.fec_cap.raw & 0x1;
                        is_dsc_supported = dpcd_caps.dsc_caps.dsc_basic_caps.raw[0] & 0x1;
                }
        } while (try_again);

        drm_modeset_drop_locks(&ctx);
        drm_modeset_acquire_fini(&ctx);

        seq_printf(m, "FEC_Sink_Support: %s\n", yesno(is_fec_supported));
        seq_printf(m, "DSC_Sink_Support: %s\n", yesno(is_dsc_supported));

        return ret;
}

/* function: Trigger virtual HPD redetection on connector
 *
 * This function will perform link rediscovery, link disable
 * and enable, and dm connector state update.
 *
 * Retrigger HPD on an existing connector by echoing 1 into
 * its respectful "trigger_hotplug" debugfs entry:
 *
 *      echo 1 > /sys/kernel/debug/dri/0/DP-X/trigger_hotplug
 *
 * This function can perform HPD unplug:
 *
 *      echo 0 > /sys/kernel/debug/dri/0/DP-X/trigger_hotplug
 *
 */
static ssize_t trigger_hotplug(struct file *f, const char __user *buf,
                                                        size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct drm_connector *connector = &aconnector->base;
        struct dc_link *link = NULL;
        struct drm_device *dev = connector->dev;
        enum dc_connection_type new_connection_type = dc_connection_none;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        long param[1] = {0};
        uint8_t param_nums = 0;

        if (!aconnector || !aconnector->dc_link)
                return -EINVAL;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                                (long *)param, buf,
                                                max_param_num,
                                                &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param[0] == 1) {
                mutex_lock(&aconnector->hpd_lock);

                if (!dc_link_detect_sink(aconnector->dc_link, &new_connection_type) &&
                        new_connection_type != dc_connection_none)
                        goto unlock;

                if (!dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD))
                        goto unlock;

                amdgpu_dm_update_connector_after_detect(aconnector);

                drm_modeset_lock_all(dev);
                dm_restore_drm_connector_state(dev, connector);
                drm_modeset_unlock_all(dev);

                drm_kms_helper_hotplug_event(dev);
        } else if (param[0] == 0) {
                if (!aconnector->dc_link)
                        goto unlock;

                link = aconnector->dc_link;

                if (link->local_sink) {
                        dc_sink_release(link->local_sink);
                        link->local_sink = NULL;
                }

                link->dpcd_sink_count = 0;
                link->type = dc_connection_none;
                link->dongle_max_pix_clk = 0;

                amdgpu_dm_update_connector_after_detect(aconnector);

                drm_modeset_lock_all(dev);
                dm_restore_drm_connector_state(dev, connector);
                drm_modeset_unlock_all(dev);

                drm_kms_helper_hotplug_event(dev);
        }

unlock:
        mutex_unlock(&aconnector->hpd_lock);

        kfree(wr_buf);
        return size;
}

/* function: read DSC status on the connector
 *
 * The read function: dp_dsc_clock_en_read
 * returns current status of DSC clock on the connector.
 * The return is a boolean flag: 1 or 0.
 *
 * Access it with the following command (you need to specify
 * connector like DP-1):
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_clock_en
 *
 * Expected output:
 * 1 - means that DSC is currently enabled
 * 0 - means that DSC is disabled
 */
static ssize_t dp_dsc_clock_en_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 10;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_clock_en);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

/* function: write force DSC on the connector
 *
 * The write function: dp_dsc_clock_en_write
 * enables to force DSC on the connector.
 * User can write to either force enable or force disable DSC
 * on the next modeset or set it to driver default
 *
 * Accepted inputs:
 * 0 - default DSC enablement policy
 * 1 - force enable DSC on the connector
 * 2 - force disable DSC on the connector (might cause fail in atomic_check)
 *
 * Writing DSC settings is done with the following command:
 * - To force enable DSC (you need to specify
 * connector like DP-1):
 *
 *      echo 0x1 > /sys/kernel/debug/dri/0/DP-X/dsc_clock_en
 *
 * - To return to default state set the flag to zero and
 * let driver deal with DSC automatically
 * (you need to specify connector like DP-1):
 *
 *      echo 0x0 > /sys/kernel/debug/dri/0/DP-X/dsc_clock_en
 *
 */
static ssize_t dp_dsc_clock_en_write(struct file *f, const char __user *buf,
                                     size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct drm_crtc *crtc = NULL;
        struct dm_crtc_state *dm_crtc_state = NULL;
        struct pipe_ctx *pipe_ctx;
        int i;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        long param[1] = {0};
        uint8_t param_nums = 0;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                            (long *)param, buf,
                                            max_param_num,
                                            &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx || !pipe_ctx->stream)
                goto done;

        // Get CRTC state
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        crtc = connector->state->crtc;
        if (crtc == NULL)
                goto unlock;

        drm_modeset_lock(&crtc->mutex, NULL);
        if (crtc->state == NULL)
                goto unlock;

        dm_crtc_state = to_dm_crtc_state(crtc->state);
        if (dm_crtc_state->stream == NULL)
                goto unlock;

        if (param[0] == 1)
                aconnector->dsc_settings.dsc_force_enable = DSC_CLK_FORCE_ENABLE;
        else if (param[0] == 2)
                aconnector->dsc_settings.dsc_force_enable = DSC_CLK_FORCE_DISABLE;
        else
                aconnector->dsc_settings.dsc_force_enable = DSC_CLK_FORCE_DEFAULT;

        dm_crtc_state->dsc_force_changed = true;

unlock:
        if (crtc)
                drm_modeset_unlock(&crtc->mutex);
        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);

done:
        kfree(wr_buf);
        return size;
}

/* function: read DSC slice width parameter on the connector
 *
 * The read function: dp_dsc_slice_width_read
 * returns dsc slice width used in the current configuration
 * The return is an integer: 0 or other positive number
 *
 * Access the status with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_slice_width
 *
 * 0 - means that DSC is disabled
 *
 * Any other number more than zero represents the
 * slice width currently used by DSC in pixels
 *
 */
static ssize_t dp_dsc_slice_width_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_slice_width);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

/* function: write DSC slice width parameter
 *
 * The write function: dp_dsc_slice_width_write
 * overwrites automatically generated DSC configuration
 * of slice width.
 *
 * The user has to write the slice width divisible by the
 * picture width.
 *
 * Also the user has to write width in hexidecimal
 * rather than in decimal.
 *
 * Writing DSC settings is done with the following command:
 * - To force overwrite slice width: (example sets to 1920 pixels)
 *
 *      echo 0x780 > /sys/kernel/debug/dri/0/DP-X/dsc_slice_width
 *
 *  - To stop overwriting and let driver find the optimal size,
 * set the width to zero:
 *
 *      echo 0x0 > /sys/kernel/debug/dri/0/DP-X/dsc_slice_width
 *
 */
static ssize_t dp_dsc_slice_width_write(struct file *f, const char __user *buf,
                                     size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct pipe_ctx *pipe_ctx;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct drm_crtc *crtc = NULL;
        struct dm_crtc_state *dm_crtc_state = NULL;
        int i;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        long param[1] = {0};
        uint8_t param_nums = 0;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                            (long *)param, buf,
                                            max_param_num,
                                            &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx || !pipe_ctx->stream)
                goto done;

        // Safely get CRTC state
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        crtc = connector->state->crtc;
        if (crtc == NULL)
                goto unlock;

        drm_modeset_lock(&crtc->mutex, NULL);
        if (crtc->state == NULL)
                goto unlock;

        dm_crtc_state = to_dm_crtc_state(crtc->state);
        if (dm_crtc_state->stream == NULL)
                goto unlock;

        if (param[0] > 0)
                aconnector->dsc_settings.dsc_num_slices_h = DIV_ROUND_UP(
                                        pipe_ctx->stream->timing.h_addressable,
                                        param[0]);
        else
                aconnector->dsc_settings.dsc_num_slices_h = 0;

        dm_crtc_state->dsc_force_changed = true;

unlock:
        if (crtc)
                drm_modeset_unlock(&crtc->mutex);
        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);

done:
        kfree(wr_buf);
        return size;
}

/* function: read DSC slice height parameter on the connector
 *
 * The read function: dp_dsc_slice_height_read
 * returns dsc slice height used in the current configuration
 * The return is an integer: 0 or other positive number
 *
 * Access the status with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_slice_height
 *
 * 0 - means that DSC is disabled
 *
 * Any other number more than zero represents the
 * slice height currently used by DSC in pixels
 *
 */
static ssize_t dp_dsc_slice_height_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_slice_height);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

/* function: write DSC slice height parameter
 *
 * The write function: dp_dsc_slice_height_write
 * overwrites automatically generated DSC configuration
 * of slice height.
 *
 * The user has to write the slice height divisible by the
 * picture height.
 *
 * Also the user has to write height in hexidecimal
 * rather than in decimal.
 *
 * Writing DSC settings is done with the following command:
 * - To force overwrite slice height (example sets to 128 pixels):
 *
 *      echo 0x80 > /sys/kernel/debug/dri/0/DP-X/dsc_slice_height
 *
 *  - To stop overwriting and let driver find the optimal size,
 * set the height to zero:
 *
 *      echo 0x0 > /sys/kernel/debug/dri/0/DP-X/dsc_slice_height
 *
 */
static ssize_t dp_dsc_slice_height_write(struct file *f, const char __user *buf,
                                     size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct drm_crtc *crtc = NULL;
        struct dm_crtc_state *dm_crtc_state = NULL;
        struct pipe_ctx *pipe_ctx;
        int i;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        uint8_t param_nums = 0;
        long param[1] = {0};

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                            (long *)param, buf,
                                            max_param_num,
                                            &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx || !pipe_ctx->stream)
                goto done;

        // Get CRTC state
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        crtc = connector->state->crtc;
        if (crtc == NULL)
                goto unlock;

        drm_modeset_lock(&crtc->mutex, NULL);
        if (crtc->state == NULL)
                goto unlock;

        dm_crtc_state = to_dm_crtc_state(crtc->state);
        if (dm_crtc_state->stream == NULL)
                goto unlock;

        if (param[0] > 0)
                aconnector->dsc_settings.dsc_num_slices_v = DIV_ROUND_UP(
                                        pipe_ctx->stream->timing.v_addressable,
                                        param[0]);
        else
                aconnector->dsc_settings.dsc_num_slices_v = 0;

        dm_crtc_state->dsc_force_changed = true;

unlock:
        if (crtc)
                drm_modeset_unlock(&crtc->mutex);
        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);

done:
        kfree(wr_buf);
        return size;
}

/* function: read DSC target rate on the connector in bits per pixel
 *
 * The read function: dp_dsc_bits_per_pixel_read
 * returns target rate of compression in bits per pixel
 * The return is an integer: 0 or other positive integer
 *
 * Access it with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_bits_per_pixel
 *
 *  0 - means that DSC is disabled
 */
static ssize_t dp_dsc_bits_per_pixel_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_bits_per_pixel);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

/* function: write DSC target rate in bits per pixel
 *
 * The write function: dp_dsc_bits_per_pixel_write
 * overwrites automatically generated DSC configuration
 * of DSC target bit rate.
 *
 * Also the user has to write bpp in hexidecimal
 * rather than in decimal.
 *
 * Writing DSC settings is done with the following command:
 * - To force overwrite rate (example sets to 256 bpp x 1/16):
 *
 *      echo 0x100 > /sys/kernel/debug/dri/0/DP-X/dsc_bits_per_pixel
 *
 *  - To stop overwriting and let driver find the optimal rate,
 * set the rate to zero:
 *
 *      echo 0x0 > /sys/kernel/debug/dri/0/DP-X/dsc_bits_per_pixel
 *
 */
static ssize_t dp_dsc_bits_per_pixel_write(struct file *f, const char __user *buf,
                                     size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct drm_crtc *crtc = NULL;
        struct dm_crtc_state *dm_crtc_state = NULL;
        struct pipe_ctx *pipe_ctx;
        int i;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        uint8_t param_nums = 0;
        long param[1] = {0};

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                            (long *)param, buf,
                                            max_param_num,
                                            &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx || !pipe_ctx->stream)
                goto done;

        // Get CRTC state
        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        crtc = connector->state->crtc;
        if (crtc == NULL)
                goto unlock;

        drm_modeset_lock(&crtc->mutex, NULL);
        if (crtc->state == NULL)
                goto unlock;

        dm_crtc_state = to_dm_crtc_state(crtc->state);
        if (dm_crtc_state->stream == NULL)
                goto unlock;

        aconnector->dsc_settings.dsc_bits_per_pixel = param[0];

        dm_crtc_state->dsc_force_changed = true;

unlock:
        if (crtc)
                drm_modeset_unlock(&crtc->mutex);
        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);

done:

        kfree(wr_buf);
        return size;
}

/* function: read DSC picture width parameter on the connector
 *
 * The read function: dp_dsc_pic_width_read
 * returns dsc picture width used in the current configuration
 * It is the same as h_addressable of the current
 * display's timing
 * The return is an integer: 0 or other positive integer
 * If 0 then DSC is disabled.
 *
 * Access it with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_pic_width
 *
 * 0 - means that DSC is disabled
 */
static ssize_t dp_dsc_pic_width_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_pic_width);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

static ssize_t dp_dsc_pic_height_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_pic_height);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

/* function: read DSC chunk size parameter on the connector
 *
 * The read function: dp_dsc_chunk_size_read
 * returns dsc chunk size set in the current configuration
 * The value is calculated automatically by DSC code
 * and depends on slice parameters and bpp target rate
 * The return is an integer: 0 or other positive integer
 * If 0 then DSC is disabled.
 *
 * Access it with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_chunk_size
 *
 * 0 - means that DSC is disabled
 */
static ssize_t dp_dsc_chunk_size_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_chunk_size);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

/* function: read DSC slice bpg offset on the connector
 *
 * The read function: dp_dsc_slice_bpg_offset_read
 * returns dsc bpg slice offset set in the current configuration
 * The value is calculated automatically by DSC code
 * and depends on slice parameters and bpp target rate
 * The return is an integer: 0 or other positive integer
 * If 0 then DSC is disabled.
 *
 * Access it with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/dsc_slice_bpg_offset
 *
 * 0 - means that DSC is disabled
 */
static ssize_t dp_dsc_slice_bpg_offset_read(struct file *f, char __user *buf,
                                    size_t size, loff_t *pos)
{
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct display_stream_compressor *dsc;
        struct dcn_dsc_state dsc_state = {0};
        const uint32_t rd_buf_size = 100;
        struct pipe_ctx *pipe_ctx;
        ssize_t result = 0;
        int i, r, str_len = 30;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        rd_buf_ptr = rd_buf;

        for (i = 0; i < MAX_PIPES; i++) {
                pipe_ctx = &aconnector->dc_link->dc->current_state->res_ctx.pipe_ctx[i];
                        if (pipe_ctx && pipe_ctx->stream &&
                            pipe_ctx->stream->link == aconnector->dc_link)
                                break;
        }

        if (!pipe_ctx)
                return -ENXIO;

        dsc = pipe_ctx->stream_res.dsc;
        if (dsc)
                dsc->funcs->dsc_read_state(dsc, &dsc_state);

        snprintf(rd_buf_ptr, str_len,
                "%d\n",
                dsc_state.dsc_slice_bpg_offset);
        rd_buf_ptr += str_len;

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */

                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}


/*
 * function description: Read max_requested_bpc property from the connector
 *
 * Access it with the following command:
 *
 *      cat /sys/kernel/debug/dri/0/DP-X/max_bpc
 *
 */
static ssize_t dp_max_bpc_read(struct file *f, char __user *buf,
                size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct drm_connector *connector = &aconnector->base;
        struct drm_device *dev = connector->dev;
        struct dm_connector_state *state;
        ssize_t result = 0;
        char *rd_buf = NULL;
        char *rd_buf_ptr = NULL;
        const uint32_t rd_buf_size = 10;
        int r;

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);

        if (!rd_buf)
                return -ENOMEM;

        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        state = to_dm_connector_state(connector->state);

        rd_buf_ptr = rd_buf;
        snprintf(rd_buf_ptr, rd_buf_size,
                "%u\n",
                state->base.max_requested_bpc);

        while (size) {
                if (*pos >= rd_buf_size)
                        break;

                r = put_user(*(rd_buf + result), buf);
                if (r) {
                        result = r; /* r = -EFAULT */
                        goto unlock;
                }
                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }
unlock:
        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);
        kfree(rd_buf);
        return result;
}


/*
 * function description: Set max_requested_bpc property on the connector
 *
 * This function will not force the input BPC on connector, it will only
 * change the max value. This is equivalent to setting max_bpc through
 * xrandr.
 *
 * The BPC value written must be >= 6 and <= 16. Values outside of this
 * range will result in errors.
 *
 * BPC values:
 *      0x6 - 6 BPC
 *      0x8 - 8 BPC
 *      0xa - 10 BPC
 *      0xc - 12 BPC
 *      0x10 - 16 BPC
 *
 * Write the max_bpc in the following way:
 *
 * echo 0x6 > /sys/kernel/debug/dri/0/DP-X/max_bpc
 *
 */
static ssize_t dp_max_bpc_write(struct file *f, const char __user *buf,
                                     size_t size, loff_t *pos)
{
        struct amdgpu_dm_connector *aconnector = file_inode(f)->i_private;
        struct drm_connector *connector = &aconnector->base;
        struct dm_connector_state *state;
        struct drm_device *dev = connector->dev;
        char *wr_buf = NULL;
        uint32_t wr_buf_size = 42;
        int max_param_num = 1;
        long param[1] = {0};
        uint8_t param_nums = 0;

        if (size == 0)
                return -EINVAL;

        wr_buf = kcalloc(wr_buf_size, sizeof(char), GFP_KERNEL);

        if (!wr_buf) {
                DRM_DEBUG_DRIVER("no memory to allocate write buffer\n");
                return -ENOSPC;
        }

        if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
                                           (long *)param, buf,
                                           max_param_num,
                                           &param_nums)) {
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        if (param[0] < 6 || param[0] > 16) {
                DRM_DEBUG_DRIVER("bad max_bpc value\n");
                kfree(wr_buf);
                return -EINVAL;
        }

        mutex_lock(&dev->mode_config.mutex);
        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        if (connector->state == NULL)
                goto unlock;

        state = to_dm_connector_state(connector->state);
        state->base.max_requested_bpc = param[0];
unlock:
        drm_modeset_unlock(&dev->mode_config.connection_mutex);
        mutex_unlock(&dev->mode_config.mutex);

        kfree(wr_buf);
        return size;
}

/*
 * Backlight at this moment.  Read only.
 * As written to display, taking ABM and backlight lut into account.
 * Ranges from 0x0 to 0x10000 (= 100% PWM)
 *
 * Example usage: cat /sys/kernel/debug/dri/0/eDP-1/current_backlight
 */
static int current_backlight_show(struct seq_file *m, void *unused)
{
        struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(m->private);
        struct dc_link *link = aconnector->dc_link;
        unsigned int backlight;

        backlight = dc_link_get_backlight_level(link);
        seq_printf(m, "0x%x\n", backlight);

        return 0;
}

/*
 * Backlight value that is being approached.  Read only.
 * As written to display, taking ABM and backlight lut into account.
 * Ranges from 0x0 to 0x10000 (= 100% PWM)
 *
 * Example usage: cat /sys/kernel/debug/dri/0/eDP-1/target_backlight
 */
static int target_backlight_show(struct seq_file *m, void *unused)
{
        struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(m->private);
        struct dc_link *link = aconnector->dc_link;
        unsigned int backlight;

        backlight = dc_link_get_target_backlight_pwm(link);
        seq_printf(m, "0x%x\n", backlight);

        return 0;
}

DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
DEFINE_SHOW_ATTRIBUTE(output_bpc);
DEFINE_SHOW_ATTRIBUTE(dp_lttpr_status);
#ifdef CONFIG_DRM_AMD_DC_HDCP
DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability);
#endif
DEFINE_SHOW_ATTRIBUTE(internal_display);

static const struct file_operations dp_dsc_clock_en_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_clock_en_read,
        .write = dp_dsc_clock_en_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_slice_width_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_slice_width_read,
        .write = dp_dsc_slice_width_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_slice_height_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_slice_height_read,
        .write = dp_dsc_slice_height_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_bits_per_pixel_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_bits_per_pixel_read,
        .write = dp_dsc_bits_per_pixel_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_pic_width_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_pic_width_read,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_pic_height_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_pic_height_read,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_chunk_size_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_chunk_size_read,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_slice_bpg_offset_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dsc_slice_bpg_offset_read,
        .llseek = default_llseek
};

static const struct file_operations trigger_hotplug_debugfs_fops = {
        .owner = THIS_MODULE,
        .write = trigger_hotplug,
        .llseek = default_llseek
};

static const struct file_operations dp_link_settings_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_link_settings_read,
        .write = dp_link_settings_write,
        .llseek = default_llseek
};

static const struct file_operations dp_phy_settings_debugfs_fop = {
        .owner = THIS_MODULE,
        .read = dp_phy_settings_read,
        .write = dp_phy_settings_write,
        .llseek = default_llseek
};

static const struct file_operations dp_phy_test_pattern_fops = {
        .owner = THIS_MODULE,
        .write = dp_phy_test_pattern_debugfs_write,
        .llseek = default_llseek
};

static const struct file_operations sdp_message_fops = {
        .owner = THIS_MODULE,
        .write = dp_sdp_message_debugfs_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dpcd_address_debugfs_fops = {
        .owner = THIS_MODULE,
        .write = dp_dpcd_address_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dpcd_size_debugfs_fops = {
        .owner = THIS_MODULE,
        .write = dp_dpcd_size_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dpcd_data_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_dpcd_data_read,
        .write = dp_dpcd_data_write,
        .llseek = default_llseek
};

static const struct file_operations dp_max_bpc_debugfs_fops = {
        .owner = THIS_MODULE,
        .read = dp_max_bpc_read,
        .write = dp_max_bpc_write,
        .llseek = default_llseek
};

static const struct file_operations dp_dsc_disable_passthrough_debugfs_fops = {
        .owner = THIS_MODULE,
        .write = dp_dsc_passthrough_set,
        .llseek = default_llseek
};

static const struct {
        char *name;
        const struct file_operations *fops;
} dp_debugfs_entries[] = {
                {"link_settings", &dp_link_settings_debugfs_fops},
                {"phy_settings", &dp_phy_settings_debugfs_fop},
                {"lttpr_status", &dp_lttpr_status_fops},
                {"test_pattern", &dp_phy_test_pattern_fops},
#ifdef CONFIG_DRM_AMD_DC_HDCP
                {"hdcp_sink_capability", &hdcp_sink_capability_fops},
#endif
                {"sdp_message", &sdp_message_fops},
                {"aux_dpcd_address", &dp_dpcd_address_debugfs_fops},
                {"aux_dpcd_size", &dp_dpcd_size_debugfs_fops},
                {"aux_dpcd_data", &dp_dpcd_data_debugfs_fops},
                {"dsc_clock_en", &dp_dsc_clock_en_debugfs_fops},
                {"dsc_slice_width", &dp_dsc_slice_width_debugfs_fops},
                {"dsc_slice_height", &dp_dsc_slice_height_debugfs_fops},
                {"dsc_bits_per_pixel", &dp_dsc_bits_per_pixel_debugfs_fops},
                {"dsc_pic_width", &dp_dsc_pic_width_debugfs_fops},
                {"dsc_pic_height", &dp_dsc_pic_height_debugfs_fops},
                {"dsc_chunk_size", &dp_dsc_chunk_size_debugfs_fops},
                {"dsc_slice_bpg", &dp_dsc_slice_bpg_offset_debugfs_fops},
                {"dp_dsc_fec_support", &dp_dsc_fec_support_fops},
                {"max_bpc", &dp_max_bpc_debugfs_fops},
                {"dsc_disable_passthrough", &dp_dsc_disable_passthrough_debugfs_fops},
};

#ifdef CONFIG_DRM_AMD_DC_HDCP
static const struct {
        char *name;
        const struct file_operations *fops;
} hdmi_debugfs_entries[] = {
                {"hdcp_sink_capability", &hdcp_sink_capability_fops}
};
#endif
/*
 * Force YUV420 output if available from the given mode
 */
static int force_yuv420_output_set(void *data, u64 val)
{
        struct amdgpu_dm_connector *connector = data;

        connector->force_yuv420_output = (bool)val;

        return 0;
}

/*
 * Check if YUV420 is forced when available from the given mode
 */
static int force_yuv420_output_get(void *data, u64 *val)
{
        struct amdgpu_dm_connector *connector = data;

        *val = connector->force_yuv420_output;

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(force_yuv420_output_fops, force_yuv420_output_get,
                         force_yuv420_output_set, "%llu\n");

/*
 *  Read PSR state
 */
static int psr_get(void *data, u64 *val)
{
        struct amdgpu_dm_connector *connector = data;
        struct dc_link *link = connector->dc_link;
        enum dc_psr_state state = PSR_STATE0;

        dc_link_get_psr_state(link, &state);

        *val = state;

        return 0;
}

/*
 * Set dmcub trace event IRQ enable or disable.
 * Usage to enable dmcub trace event IRQ: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dmcub_trace_event_en
 * Usage to disable dmcub trace event IRQ: echo 0 > /sys/kernel/debug/dri/0/amdgpu_dm_dmcub_trace_event_en
 */
static int dmcub_trace_event_state_set(void *data, u64 val)
{
        struct amdgpu_device *adev = data;

        if (val == 1 || val == 0) {
                dc_dmub_trace_event_control(adev->dm.dc, val);
                adev->dm.dmcub_trace_event_en = (bool)val;
        } else
                return 0;

        return 0;
}

/*
 * The interface doesn't need get function, so it will return the
 * value of zero
 * Usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dmcub_trace_event_en
 */
static int dmcub_trace_event_state_get(void *data, u64 *val)
{
        struct amdgpu_device *adev = data;

        *val = adev->dm.dmcub_trace_event_en;
        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(dmcub_trace_event_state_fops, dmcub_trace_event_state_get,
                         dmcub_trace_event_state_set, "%llu\n");

DEFINE_DEBUGFS_ATTRIBUTE(psr_fops, psr_get, NULL, "%llu\n");

DEFINE_SHOW_ATTRIBUTE(current_backlight);
DEFINE_SHOW_ATTRIBUTE(target_backlight);

static const struct {
        char *name;
        const struct file_operations *fops;
} connector_debugfs_entries[] = {
                {"force_yuv420_output", &force_yuv420_output_fops},
                {"output_bpc", &output_bpc_fops},
                {"trigger_hotplug", &trigger_hotplug_debugfs_fops},
                {"internal_display", &internal_display_fops}
};

void connector_debugfs_init(struct amdgpu_dm_connector *connector)
{
        int i;
        struct dentry *dir = connector->base.debugfs_entry;

        if (connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
            connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
                for (i = 0; i < ARRAY_SIZE(dp_debugfs_entries); i++) {
                        debugfs_create_file(dp_debugfs_entries[i].name,
                                            0644, dir, connector,
                                            dp_debugfs_entries[i].fops);
                }
        }
        if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
                debugfs_create_file_unsafe("psr_state", 0444, dir, connector, &psr_fops);
                debugfs_create_file("amdgpu_current_backlight_pwm", 0444, dir, connector,
                                    &current_backlight_fops);
                debugfs_create_file("amdgpu_target_backlight_pwm", 0444, dir, connector,
                                    &target_backlight_fops);
        }

        for (i = 0; i < ARRAY_SIZE(connector_debugfs_entries); i++) {
                debugfs_create_file(connector_debugfs_entries[i].name,
                                    0644, dir, connector,
                                    connector_debugfs_entries[i].fops);
        }

        connector->debugfs_dpcd_address = 0;
        connector->debugfs_dpcd_size = 0;

#ifdef CONFIG_DRM_AMD_DC_HDCP
        if (connector->base.connector_type == DRM_MODE_CONNECTOR_HDMIA) {
                for (i = 0; i < ARRAY_SIZE(hdmi_debugfs_entries); i++) {
                        debugfs_create_file(hdmi_debugfs_entries[i].name,
                                            0644, dir, connector,
                                            hdmi_debugfs_entries[i].fops);
                }
        }
#endif
}

#ifdef CONFIG_DRM_AMD_SECURE_DISPLAY
/*
 * Set crc window coordinate x start
 */
static int crc_win_x_start_set(void *data, u64 val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        acrtc->dm_irq_params.crc_window.x_start = (uint16_t) val;
        acrtc->dm_irq_params.crc_window.update_win = false;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

/*
 * Get crc window coordinate x start
 */
static int crc_win_x_start_get(void *data, u64 *val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        *val = acrtc->dm_irq_params.crc_window.x_start;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(crc_win_x_start_fops, crc_win_x_start_get,
                         crc_win_x_start_set, "%llu\n");


/*
 * Set crc window coordinate y start
 */
static int crc_win_y_start_set(void *data, u64 val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        acrtc->dm_irq_params.crc_window.y_start = (uint16_t) val;
        acrtc->dm_irq_params.crc_window.update_win = false;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

/*
 * Get crc window coordinate y start
 */
static int crc_win_y_start_get(void *data, u64 *val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        *val = acrtc->dm_irq_params.crc_window.y_start;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(crc_win_y_start_fops, crc_win_y_start_get,
                         crc_win_y_start_set, "%llu\n");

/*
 * Set crc window coordinate x end
 */
static int crc_win_x_end_set(void *data, u64 val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        acrtc->dm_irq_params.crc_window.x_end = (uint16_t) val;
        acrtc->dm_irq_params.crc_window.update_win = false;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

/*
 * Get crc window coordinate x end
 */
static int crc_win_x_end_get(void *data, u64 *val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        *val = acrtc->dm_irq_params.crc_window.x_end;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(crc_win_x_end_fops, crc_win_x_end_get,
                         crc_win_x_end_set, "%llu\n");

/*
 * Set crc window coordinate y end
 */
static int crc_win_y_end_set(void *data, u64 val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        acrtc->dm_irq_params.crc_window.y_end = (uint16_t) val;
        acrtc->dm_irq_params.crc_window.update_win = false;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

/*
 * Get crc window coordinate y end
 */
static int crc_win_y_end_get(void *data, u64 *val)
{
        struct drm_crtc *crtc = data;
        struct drm_device *drm_dev = crtc->dev;
        struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);

        spin_lock_irq(&drm_dev->event_lock);
        *val = acrtc->dm_irq_params.crc_window.y_end;
        spin_unlock_irq(&drm_dev->event_lock);

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(crc_win_y_end_fops, crc_win_y_end_get,
                         crc_win_y_end_set, "%llu\n");
/*
 * Trigger to commit crc window
 */
static int crc_win_update_set(void *data, u64 val)
{
        struct drm_crtc *new_crtc = data;
        struct drm_crtc *old_crtc = NULL;
        struct amdgpu_crtc *new_acrtc, *old_acrtc;
        struct amdgpu_device *adev = drm_to_adev(new_crtc->dev);
        struct crc_rd_work *crc_rd_wrk = adev->dm.crc_rd_wrk;

        if (val) {
                spin_lock_irq(&adev_to_drm(adev)->event_lock);
                spin_lock_irq(&crc_rd_wrk->crc_rd_work_lock);
                if (crc_rd_wrk && crc_rd_wrk->crtc) {
                        old_crtc = crc_rd_wrk->crtc;
                        old_acrtc = to_amdgpu_crtc(old_crtc);
                }
                new_acrtc = to_amdgpu_crtc(new_crtc);

                if (old_crtc && old_crtc != new_crtc) {
                        old_acrtc->dm_irq_params.crc_window.activated = false;
                        old_acrtc->dm_irq_params.crc_window.update_win = false;
                        old_acrtc->dm_irq_params.crc_window.skip_frame_cnt = 0;

                        new_acrtc->dm_irq_params.crc_window.activated = true;
                        new_acrtc->dm_irq_params.crc_window.update_win = true;
                        new_acrtc->dm_irq_params.crc_window.skip_frame_cnt = 0;
                        crc_rd_wrk->crtc = new_crtc;
                } else {
                        new_acrtc->dm_irq_params.crc_window.activated = true;
                        new_acrtc->dm_irq_params.crc_window.update_win = true;
                        new_acrtc->dm_irq_params.crc_window.skip_frame_cnt = 0;
                        crc_rd_wrk->crtc = new_crtc;
                }
                spin_unlock_irq(&crc_rd_wrk->crc_rd_work_lock);
                spin_unlock_irq(&adev_to_drm(adev)->event_lock);
        }

        return 0;
}

/*
 * Get crc window update flag
 */
static int crc_win_update_get(void *data, u64 *val)
{
        *val = 0;
        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(crc_win_update_fops, crc_win_update_get,
                         crc_win_update_set, "%llu\n");

void crtc_debugfs_init(struct drm_crtc *crtc)
{
        struct dentry *dir = debugfs_lookup("crc", crtc->debugfs_entry);

        if (!dir)
                return;

        debugfs_create_file_unsafe("crc_win_x_start", 0644, dir, crtc,
                                   &crc_win_x_start_fops);
        debugfs_create_file_unsafe("crc_win_y_start", 0644, dir, crtc,
                                   &crc_win_y_start_fops);
        debugfs_create_file_unsafe("crc_win_x_end", 0644, dir, crtc,
                                   &crc_win_x_end_fops);
        debugfs_create_file_unsafe("crc_win_y_end", 0644, dir, crtc,
                                   &crc_win_y_end_fops);
        debugfs_create_file_unsafe("crc_win_update", 0644, dir, crtc,
                                   &crc_win_update_fops);

}
#endif
/*
 * Writes DTN log state to the user supplied buffer.
 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
 */
static ssize_t dtn_log_read(
        struct file *f,
        char __user *buf,
        size_t size,
        loff_t *pos)
{
        struct amdgpu_device *adev = file_inode(f)->i_private;
        struct dc *dc = adev->dm.dc;
        struct dc_log_buffer_ctx log_ctx = { 0 };
        ssize_t result = 0;

        if (!buf || !size)
                return -EINVAL;

        if (!dc->hwss.log_hw_state)
                return 0;

        dc->hwss.log_hw_state(dc, &log_ctx);

        if (*pos < log_ctx.pos) {
                size_t to_copy = log_ctx.pos - *pos;

                to_copy = min(to_copy, size);

                if (!copy_to_user(buf, log_ctx.buf + *pos, to_copy)) {
                        *pos += to_copy;
                        result = to_copy;
                }
        }

        kfree(log_ctx.buf);

        return result;
}

/*
 * Writes DTN log state to dmesg when triggered via a write.
 * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_dtn_log
 */
static ssize_t dtn_log_write(
        struct file *f,
        const char __user *buf,
        size_t size,
        loff_t *pos)
{
        struct amdgpu_device *adev = file_inode(f)->i_private;
        struct dc *dc = adev->dm.dc;

        /* Write triggers log output via dmesg. */
        if (size == 0)
                return 0;

        if (dc->hwss.log_hw_state)
                dc->hwss.log_hw_state(dc, NULL);

        return size;
}

static int mst_topo_show(struct seq_file *m, void *unused)
{
        struct amdgpu_device *adev = (struct amdgpu_device *)m->private;
        struct drm_device *dev = adev_to_drm(adev);
        struct drm_connector *connector;
        struct drm_connector_list_iter conn_iter;
        struct amdgpu_dm_connector *aconnector;

        drm_connector_list_iter_begin(dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                if (connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort)
                        continue;

                aconnector = to_amdgpu_dm_connector(connector);

                /* Ensure we're only dumping the topology of a root mst node */
                if (!aconnector->mst_mgr.mst_state)
                        continue;

                seq_printf(m, "\nMST topology for connector %d\n", aconnector->connector_id);
                drm_dp_mst_dump_topology(m, &aconnector->mst_mgr);
        }
        drm_connector_list_iter_end(&conn_iter);

        return 0;
}

/*
 * Sets trigger hpd for MST topologies.
 * All connected connectors will be rediscovered and re started as needed if val of 1 is sent.
 * All topologies will be disconnected if val of 0 is set .
 * Usage to enable topologies: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_trigger_hpd_mst
 * Usage to disable topologies: echo 0 > /sys/kernel/debug/dri/0/amdgpu_dm_trigger_hpd_mst
 */
static int trigger_hpd_mst_set(void *data, u64 val)
{
        struct amdgpu_device *adev = data;
        struct drm_device *dev = adev_to_drm(adev);
        struct drm_connector_list_iter iter;
        struct amdgpu_dm_connector *aconnector;
        struct drm_connector *connector;
        struct dc_link *link = NULL;

        if (val == 1) {
                drm_connector_list_iter_begin(dev, &iter);
                drm_for_each_connector_iter(connector, &iter) {
                        aconnector = to_amdgpu_dm_connector(connector);
                        if (aconnector->dc_link->type == dc_connection_mst_branch &&
                            aconnector->mst_mgr.aux) {
                                dc_link_detect(aconnector->dc_link, DETECT_REASON_HPD);
                                drm_dp_mst_topology_mgr_set_mst(&aconnector->mst_mgr, true);
                        }
                }
        } else if (val == 0) {
                drm_connector_list_iter_begin(dev, &iter);
                drm_for_each_connector_iter(connector, &iter) {
                        aconnector = to_amdgpu_dm_connector(connector);
                        if (!aconnector->dc_link)
                                continue;

                        if (!aconnector->mst_port)
                                continue;

                        link = aconnector->dc_link;
                        dp_receiver_power_ctrl(link, false);
                        drm_dp_mst_topology_mgr_set_mst(&aconnector->mst_port->mst_mgr, false);
                        link->mst_stream_alloc_table.stream_count = 0;
                        memset(link->mst_stream_alloc_table.stream_allocations, 0,
                                        sizeof(link->mst_stream_alloc_table.stream_allocations));
                }
        } else {
                return 0;
        }
        drm_kms_helper_hotplug_event(dev);

        return 0;
}

/*
 * The interface doesn't need get function, so it will return the
 * value of zero
 * Usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_trigger_hpd_mst
 */
static int trigger_hpd_mst_get(void *data, u64 *val)
{
        *val = 0;
        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(trigger_hpd_mst_ops, trigger_hpd_mst_get,
                         trigger_hpd_mst_set, "%llu\n");


/*
 * Sets the force_timing_sync debug option from the given string.
 * All connected displays will be force synchronized immediately.
 * Usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_dm_force_timing_sync
 */
static int force_timing_sync_set(void *data, u64 val)
{
        struct amdgpu_device *adev = data;

        adev->dm.force_timing_sync = (bool)val;

        amdgpu_dm_trigger_timing_sync(adev_to_drm(adev));

        return 0;
}

/*
 * Gets the force_timing_sync debug option value into the given buffer.
 * Usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_force_timing_sync
 */
static int force_timing_sync_get(void *data, u64 *val)
{
        struct amdgpu_device *adev = data;

        *val = adev->dm.force_timing_sync;

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(force_timing_sync_ops, force_timing_sync_get,
                         force_timing_sync_set, "%llu\n");


/*
 * Disables all HPD and HPD RX interrupt handling in the
 * driver when set to 1. Default is 0.
 */
static int disable_hpd_set(void *data, u64 val)
{
        struct amdgpu_device *adev = data;

        adev->dm.disable_hpd_irq = (bool)val;

        return 0;
}


/*
 * Returns 1 if HPD and HPRX interrupt handling is disabled,
 * 0 otherwise.
 */
static int disable_hpd_get(void *data, u64 *val)
{
        struct amdgpu_device *adev = data;

        *val = adev->dm.disable_hpd_irq;

        return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(disable_hpd_ops, disable_hpd_get,
                         disable_hpd_set, "%llu\n");

/*
 * Sets the DC visual confirm debug option from the given string.
 * Example usage: echo 1 > /sys/kernel/debug/dri/0/amdgpu_visual_confirm
 */
static int visual_confirm_set(void *data, u64 val)
{
        struct amdgpu_device *adev = data;

        adev->dm.dc->debug.visual_confirm = (enum visual_confirm)val;

        return 0;
}

/*
 * Reads the DC visual confirm debug option value into the given buffer.
 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm
 */
static int visual_confirm_get(void *data, u64 *val)
{
        struct amdgpu_device *adev = data;

        *val = adev->dm.dc->debug.visual_confirm;

        return 0;
}

DEFINE_SHOW_ATTRIBUTE(mst_topo);
DEFINE_DEBUGFS_ATTRIBUTE(visual_confirm_fops, visual_confirm_get,
                         visual_confirm_set, "%llu\n");

/*
 * Dumps the DCC_EN bit for each pipe.
 * Example usage: cat /sys/kernel/debug/dri/0/amdgpu_dm_dcc_en
 */
static ssize_t dcc_en_bits_read(
        struct file *f,
        char __user *buf,
        size_t size,
        loff_t *pos)
{
        struct amdgpu_device *adev = file_inode(f)->i_private;
        struct dc *dc = adev->dm.dc;
        char *rd_buf = NULL;
        const uint32_t rd_buf_size = 32;
        uint32_t result = 0;
        int offset = 0;
        int num_pipes = dc->res_pool->pipe_count;
        int *dcc_en_bits;
        int i, r;

        dcc_en_bits = kcalloc(num_pipes, sizeof(int), GFP_KERNEL);
        if (!dcc_en_bits)
                return -ENOMEM;

        if (!dc->hwss.get_dcc_en_bits) {
                kfree(dcc_en_bits);
                return 0;
        }

        dc->hwss.get_dcc_en_bits(dc, dcc_en_bits);

        rd_buf = kcalloc(rd_buf_size, sizeof(char), GFP_KERNEL);
        if (!rd_buf)
                return -ENOMEM;

        for (i = 0; i < num_pipes; i++)
                offset += snprintf(rd_buf + offset, rd_buf_size - offset,
                                   "%d  ", dcc_en_bits[i]);
        rd_buf[strlen(rd_buf)] = '\n';

        kfree(dcc_en_bits);

        while (size) {
                if (*pos >= rd_buf_size)
                        break;
                r = put_user(*(rd_buf + result), buf);
                if (r)
                        return r; /* r = -EFAULT */
                buf += 1;
                size -= 1;
                *pos += 1;
                result += 1;
        }

        kfree(rd_buf);
        return result;
}

void dtn_debugfs_init(struct amdgpu_device *adev)
{
        static const struct file_operations dtn_log_fops = {
                .owner = THIS_MODULE,
                .read = dtn_log_read,
                .write = dtn_log_write,
                .llseek = default_llseek
        };
        static const struct file_operations dcc_en_bits_fops = {
                .owner = THIS_MODULE,
                .read = dcc_en_bits_read,
                .llseek = default_llseek
        };

        struct drm_minor *minor = adev_to_drm(adev)->primary;
        struct dentry *root = minor->debugfs_root;

        debugfs_create_file("amdgpu_mst_topology", 0444, root,
                            adev, &mst_topo_fops);
        debugfs_create_file("amdgpu_dm_dtn_log", 0644, root, adev,
                            &dtn_log_fops);

        debugfs_create_file_unsafe("amdgpu_dm_visual_confirm", 0644, root, adev,
                                   &visual_confirm_fops);

        debugfs_create_file_unsafe("amdgpu_dm_dmub_tracebuffer", 0644, root,
                                   adev, &dmub_tracebuffer_fops);

        debugfs_create_file_unsafe("amdgpu_dm_dmub_fw_state", 0644, root,
                                   adev, &dmub_fw_state_fops);

        debugfs_create_file_unsafe("amdgpu_dm_force_timing_sync", 0644, root,
                                   adev, &force_timing_sync_ops);

        debugfs_create_file_unsafe("amdgpu_dm_dmcub_trace_event_en", 0644, root,
                                   adev, &dmcub_trace_event_state_fops);

        debugfs_create_file_unsafe("amdgpu_dm_trigger_hpd_mst", 0644, root,
                                   adev, &trigger_hpd_mst_ops);

        debugfs_create_file_unsafe("amdgpu_dm_dcc_en", 0644, root, adev,
                                   &dcc_en_bits_fops);

        debugfs_create_file_unsafe("amdgpu_dm_disable_hpd", 0644, root, adev,
                                   &disable_hpd_ops);

}