/*
 * Copyright 2012-16 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/slab.h>

#include "dce_clk_mgr.h"

#include "reg_helper.h"
#include "dmcu.h"
#include "core_types.h"
#include "dal_asic_id.h"

#define TO_DCE_CLK_MGR(clocks)\
        container_of(clocks, struct dce_clk_mgr, base)

#define REG(reg) \
        (clk_mgr_dce->regs->reg)

#undef FN
#define FN(reg_name, field_name) \
        clk_mgr_dce->clk_mgr_shift->field_name, clk_mgr_dce->clk_mgr_mask->field_name

#define CTX \
        clk_mgr_dce->base.ctx
#define DC_LOGGER \
        clk_mgr->ctx->logger

/* Max clock values for each state indexed by "enum clocks_state": */
static const struct state_dependent_clocks dce80_max_clks_by_state[] = {
/* ClocksStateInvalid - should not be used */
{ .display_clk_khz = 0, .pixel_clk_khz = 0 },
/* ClocksStateUltraLow - not expected to be used for DCE 8.0 */
{ .display_clk_khz = 0, .pixel_clk_khz = 0 },
/* ClocksStateLow */
{ .display_clk_khz = 352000, .pixel_clk_khz = 330000},
/* ClocksStateNominal */
{ .display_clk_khz = 600000, .pixel_clk_khz = 400000 },
/* ClocksStatePerformance */
{ .display_clk_khz = 600000, .pixel_clk_khz = 400000 } };

static const struct state_dependent_clocks dce110_max_clks_by_state[] = {
/*ClocksStateInvalid - should not be used*/
{ .display_clk_khz = 0, .pixel_clk_khz = 0 },
/*ClocksStateUltraLow - currently by HW design team not supposed to be used*/
{ .display_clk_khz = 352000, .pixel_clk_khz = 330000 },
/*ClocksStateLow*/
{ .display_clk_khz = 352000, .pixel_clk_khz = 330000 },
/*ClocksStateNominal*/
{ .display_clk_khz = 467000, .pixel_clk_khz = 400000 },
/*ClocksStatePerformance*/
{ .display_clk_khz = 643000, .pixel_clk_khz = 400000 } };

static const struct state_dependent_clocks dce112_max_clks_by_state[] = {
/*ClocksStateInvalid - should not be used*/
{ .display_clk_khz = 0, .pixel_clk_khz = 0 },
/*ClocksStateUltraLow - currently by HW design team not supposed to be used*/
{ .display_clk_khz = 389189, .pixel_clk_khz = 346672 },
/*ClocksStateLow*/
{ .display_clk_khz = 459000, .pixel_clk_khz = 400000 },
/*ClocksStateNominal*/
{ .display_clk_khz = 667000, .pixel_clk_khz = 600000 },
/*ClocksStatePerformance*/
{ .display_clk_khz = 1132000, .pixel_clk_khz = 600000 } };

static const struct state_dependent_clocks dce120_max_clks_by_state[] = {
/*ClocksStateInvalid - should not be used*/
{ .display_clk_khz = 0, .pixel_clk_khz = 0 },
/*ClocksStateUltraLow - currently by HW design team not supposed to be used*/
{ .display_clk_khz = 0, .pixel_clk_khz = 0 },
/*ClocksStateLow*/
{ .display_clk_khz = 460000, .pixel_clk_khz = 400000 },
/*ClocksStateNominal*/
{ .display_clk_khz = 670000, .pixel_clk_khz = 600000 },
/*ClocksStatePerformance*/
{ .display_clk_khz = 1133000, .pixel_clk_khz = 600000 } };

int dentist_get_divider_from_did(int did)
{
        if (did < DENTIST_BASE_DID_1)
                did = DENTIST_BASE_DID_1;
        if (did > DENTIST_MAX_DID)
                did = DENTIST_MAX_DID;

        if (did < DENTIST_BASE_DID_2) {
                return DENTIST_DIVIDER_RANGE_1_START + DENTIST_DIVIDER_RANGE_1_STEP
                                                        * (did - DENTIST_BASE_DID_1);
        } else if (did < DENTIST_BASE_DID_3) {
                return DENTIST_DIVIDER_RANGE_2_START + DENTIST_DIVIDER_RANGE_2_STEP
                                                        * (did - DENTIST_BASE_DID_2);
        } else if (did < DENTIST_BASE_DID_4) {
                return DENTIST_DIVIDER_RANGE_3_START + DENTIST_DIVIDER_RANGE_3_STEP
                                                        * (did - DENTIST_BASE_DID_3);
        } else {
                return DENTIST_DIVIDER_RANGE_4_START + DENTIST_DIVIDER_RANGE_4_STEP
                                                        * (did - DENTIST_BASE_DID_4);
        }
}

/* SW will adjust DP REF Clock average value for all purposes
 * (DP DTO / DP Audio DTO and DP GTC)
 if clock is spread for all cases:
 -if SS enabled on DP Ref clock and HW de-spreading enabled with SW
 calculations for DS_INCR/DS_MODULO (this is planned to be default case)
 -if SS enabled on DP Ref clock and HW de-spreading enabled with HW
 calculations (not planned to be used, but average clock should still
 be valid)
 -if SS enabled on DP Ref clock and HW de-spreading disabled
 (should not be case with CIK) then SW should program all rates
 generated according to average value (case as with previous ASICs)
  */
static int clk_mgr_adjust_dp_ref_freq_for_ss(struct dce_clk_mgr *clk_mgr_dce, int dp_ref_clk_khz)
{
        if (clk_mgr_dce->ss_on_dprefclk && clk_mgr_dce->dprefclk_ss_divider != 0) {
                struct fixed31_32 ss_percentage = dc_fixpt_div_int(
                                dc_fixpt_from_fraction(clk_mgr_dce->dprefclk_ss_percentage,
                                                        clk_mgr_dce->dprefclk_ss_divider), 200);
                struct fixed31_32 adj_dp_ref_clk_khz;

                ss_percentage = dc_fixpt_sub(dc_fixpt_one, ss_percentage);
                adj_dp_ref_clk_khz = dc_fixpt_mul_int(ss_percentage, dp_ref_clk_khz);
                dp_ref_clk_khz = dc_fixpt_floor(adj_dp_ref_clk_khz);
        }
        return dp_ref_clk_khz;
}

static int dce_get_dp_ref_freq_khz(struct clk_mgr *clk_mgr)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        int dprefclk_wdivider;
        int dprefclk_src_sel;
        int dp_ref_clk_khz = 600000;
        int target_div;

        /* ASSERT DP Reference Clock source is from DFS*/
        REG_GET(DPREFCLK_CNTL, DPREFCLK_SRC_SEL, &dprefclk_src_sel);
        ASSERT(dprefclk_src_sel == 0);

        /* Read the mmDENTIST_DISPCLK_CNTL to get the currently
         * programmed DID DENTIST_DPREFCLK_WDIVIDER*/
        REG_GET(DENTIST_DISPCLK_CNTL, DENTIST_DPREFCLK_WDIVIDER, &dprefclk_wdivider);

        /* Convert DENTIST_DPREFCLK_WDIVIDERto actual divider*/
        target_div = dentist_get_divider_from_did(dprefclk_wdivider);

        /* Calculate the current DFS clock, in kHz.*/
        dp_ref_clk_khz = (DENTIST_DIVIDER_RANGE_SCALE_FACTOR
                * clk_mgr_dce->dentist_vco_freq_khz) / target_div;

        return clk_mgr_adjust_dp_ref_freq_for_ss(clk_mgr_dce, dp_ref_clk_khz);
}

int dce12_get_dp_ref_freq_khz(struct clk_mgr *clk_mgr)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);

        return clk_mgr_adjust_dp_ref_freq_for_ss(clk_mgr_dce, clk_mgr_dce->dprefclk_khz);
}

/* unit: in_khz before mode set, get pixel clock from context. ASIC register
 * may not be programmed yet
 */
static uint32_t get_max_pixel_clock_for_all_paths(struct dc_state *context)
{
        uint32_t max_pix_clk = 0;
        int i;

        for (i = 0; i < MAX_PIPES; i++) {
                struct pipe_ctx *pipe_ctx = &context->res_ctx.pipe_ctx[i];

                if (pipe_ctx->stream == NULL)
                        continue;

                /* do not check under lay */
                if (pipe_ctx->top_pipe)
                        continue;

                if (pipe_ctx->stream_res.pix_clk_params.requested_pix_clk_100hz / 10 > max_pix_clk)
                        max_pix_clk = pipe_ctx->stream_res.pix_clk_params.requested_pix_clk_100hz / 10;

                /* raise clock state for HBR3/2 if required. Confirmed with HW DCE/DPCS
                 * logic for HBR3 still needs Nominal (0.8V) on VDDC rail
                 */
                if (dc_is_dp_signal(pipe_ctx->stream->signal) &&
                                pipe_ctx->stream_res.pix_clk_params.requested_sym_clk > max_pix_clk)
                        max_pix_clk = pipe_ctx->stream_res.pix_clk_params.requested_sym_clk;
        }

        return max_pix_clk;
}

static enum dm_pp_clocks_state dce_get_required_clocks_state(
        struct clk_mgr *clk_mgr,
        struct dc_state *context)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        int i;
        enum dm_pp_clocks_state low_req_clk;
        int max_pix_clk = get_max_pixel_clock_for_all_paths(context);

        /* Iterate from highest supported to lowest valid state, and update
         * lowest RequiredState with the lowest state that satisfies
         * all required clocks
         */
        for (i = clk_mgr_dce->max_clks_state; i >= DM_PP_CLOCKS_STATE_ULTRA_LOW; i--)
                if (context->bw_ctx.bw.dce.dispclk_khz >
                                clk_mgr_dce->max_clks_by_state[i].display_clk_khz
                        || max_pix_clk >
                                clk_mgr_dce->max_clks_by_state[i].pixel_clk_khz)
                        break;

        low_req_clk = i + 1;
        if (low_req_clk > clk_mgr_dce->max_clks_state) {
                /* set max clock state for high phyclock, invalid on exceeding display clock */
                if (clk_mgr_dce->max_clks_by_state[clk_mgr_dce->max_clks_state].display_clk_khz
                                < context->bw_ctx.bw.dce.dispclk_khz)
                        low_req_clk = DM_PP_CLOCKS_STATE_INVALID;
                else
                        low_req_clk = clk_mgr_dce->max_clks_state;
        }

        return low_req_clk;
}

static int dce_set_clock(
        struct clk_mgr *clk_mgr,
        int requested_clk_khz)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        struct bp_pixel_clock_parameters pxl_clk_params = { 0 };
        struct dc_bios *bp = clk_mgr->ctx->dc_bios;
        int actual_clock = requested_clk_khz;
        struct dmcu *dmcu = clk_mgr_dce->base.ctx->dc->res_pool->dmcu;

        /* Make sure requested clock isn't lower than minimum threshold*/
        if (requested_clk_khz > 0)
                requested_clk_khz = max(requested_clk_khz,
                                clk_mgr_dce->dentist_vco_freq_khz / 64);

        /* Prepare to program display clock*/
        pxl_clk_params.target_pixel_clock_100hz = requested_clk_khz * 10;
        pxl_clk_params.pll_id = CLOCK_SOURCE_ID_DFS;

        if (clk_mgr_dce->dfs_bypass_active)
                pxl_clk_params.flags.SET_DISPCLK_DFS_BYPASS = true;

        bp->funcs->program_display_engine_pll(bp, &pxl_clk_params);

        if (clk_mgr_dce->dfs_bypass_active) {
                /* Cache the fixed display clock*/
                clk_mgr_dce->dfs_bypass_disp_clk =
                        pxl_clk_params.dfs_bypass_display_clock;
                actual_clock = pxl_clk_params.dfs_bypass_display_clock;
        }

        /* from power down, we need mark the clock state as ClocksStateNominal
         * from HWReset, so when resume we will call pplib voltage regulator.*/
        if (requested_clk_khz == 0)
                clk_mgr_dce->cur_min_clks_state = DM_PP_CLOCKS_STATE_NOMINAL;

        if (dmcu && dmcu->funcs->is_dmcu_initialized(dmcu))
                dmcu->funcs->set_psr_wait_loop(dmcu, actual_clock / 1000 / 7);

        return actual_clock;
}

int dce112_set_clock(struct clk_mgr *clk_mgr, int requested_clk_khz)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        struct bp_set_dce_clock_parameters dce_clk_params;
        struct dc_bios *bp = clk_mgr->ctx->dc_bios;
        struct dc *core_dc = clk_mgr->ctx->dc;
        struct dmcu *dmcu = core_dc->res_pool->dmcu;
        int actual_clock = requested_clk_khz;
        /* Prepare to program display clock*/
        memset(&dce_clk_params, 0, sizeof(dce_clk_params));

        /* Make sure requested clock isn't lower than minimum threshold*/
        if (requested_clk_khz > 0)
                requested_clk_khz = max(requested_clk_khz,
                                clk_mgr_dce->dentist_vco_freq_khz / 62);

        dce_clk_params.target_clock_frequency = requested_clk_khz;
        dce_clk_params.pll_id = CLOCK_SOURCE_ID_DFS;
        dce_clk_params.clock_type = DCECLOCK_TYPE_DISPLAY_CLOCK;

        bp->funcs->set_dce_clock(bp, &dce_clk_params);
        actual_clock = dce_clk_params.target_clock_frequency;

        /* from power down, we need mark the clock state as ClocksStateNominal
         * from HWReset, so when resume we will call pplib voltage regulator.*/
        if (requested_clk_khz == 0)
                clk_mgr_dce->cur_min_clks_state = DM_PP_CLOCKS_STATE_NOMINAL;

        /*Program DP ref Clock*/
        /*VBIOS will determine DPREFCLK frequency, so we don't set it*/
        dce_clk_params.target_clock_frequency = 0;
        dce_clk_params.clock_type = DCECLOCK_TYPE_DPREFCLK;
        if (!ASICREV_IS_VEGA20_P(clk_mgr->ctx->asic_id.hw_internal_rev))
                dce_clk_params.flags.USE_GENLOCK_AS_SOURCE_FOR_DPREFCLK =
                        (dce_clk_params.pll_id ==
                                        CLOCK_SOURCE_COMBO_DISPLAY_PLL0);
        else
                dce_clk_params.flags.USE_GENLOCK_AS_SOURCE_FOR_DPREFCLK = false;

        bp->funcs->set_dce_clock(bp, &dce_clk_params);

        if (!IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment)) {
                if (dmcu && dmcu->funcs->is_dmcu_initialized(dmcu)) {
                        if (clk_mgr_dce->dfs_bypass_disp_clk != actual_clock)
                                dmcu->funcs->set_psr_wait_loop(dmcu,
                                                actual_clock / 1000 / 7);
                }
        }

        clk_mgr_dce->dfs_bypass_disp_clk = actual_clock;
        return actual_clock;
}

static void dce_clock_read_integrated_info(struct dce_clk_mgr *clk_mgr_dce)
{
        struct dc_debug_options *debug = &clk_mgr_dce->base.ctx->dc->debug;
        struct dc_bios *bp = clk_mgr_dce->base.ctx->dc_bios;
        struct integrated_info info = { { { 0 } } };
        struct dc_firmware_info fw_info = { { 0 } };
        int i;

        if (bp->integrated_info)
                info = *bp->integrated_info;

        clk_mgr_dce->dentist_vco_freq_khz = info.dentist_vco_freq;
        if (clk_mgr_dce->dentist_vco_freq_khz == 0) {
                bp->funcs->get_firmware_info(bp, &fw_info);
                clk_mgr_dce->dentist_vco_freq_khz =
                        fw_info.smu_gpu_pll_output_freq;
                if (clk_mgr_dce->dentist_vco_freq_khz == 0)
                        clk_mgr_dce->dentist_vco_freq_khz = 3600000;
        }

        /*update the maximum display clock for each power state*/
        for (i = 0; i < NUMBER_OF_DISP_CLK_VOLTAGE; ++i) {
                enum dm_pp_clocks_state clk_state = DM_PP_CLOCKS_STATE_INVALID;

                switch (i) {
                case 0:
                        clk_state = DM_PP_CLOCKS_STATE_ULTRA_LOW;
                        break;

                case 1:
                        clk_state = DM_PP_CLOCKS_STATE_LOW;
                        break;

                case 2:
                        clk_state = DM_PP_CLOCKS_STATE_NOMINAL;
                        break;

                case 3:
                        clk_state = DM_PP_CLOCKS_STATE_PERFORMANCE;
                        break;

                default:
                        clk_state = DM_PP_CLOCKS_STATE_INVALID;
                        break;
                }

                /*Do not allow bad VBIOS/SBIOS to override with invalid values,
                 * check for > 100MHz*/
                if (info.disp_clk_voltage[i].max_supported_clk >= 100000)
                        clk_mgr_dce->max_clks_by_state[clk_state].display_clk_khz =
                                info.disp_clk_voltage[i].max_supported_clk;
        }

        if (!debug->disable_dfs_bypass && bp->integrated_info)
                if (bp->integrated_info->gpu_cap_info & DFS_BYPASS_ENABLE)
                        clk_mgr_dce->dfs_bypass_enabled = true;
}

void dce_clock_read_ss_info(struct dce_clk_mgr *clk_mgr_dce)
{
        struct dc_bios *bp = clk_mgr_dce->base.ctx->dc_bios;
        int ss_info_num = bp->funcs->get_ss_entry_number(
                        bp, AS_SIGNAL_TYPE_GPU_PLL);

        if (ss_info_num) {
                struct spread_spectrum_info info = { { 0 } };
                enum bp_result result = bp->funcs->get_spread_spectrum_info(
                                bp, AS_SIGNAL_TYPE_GPU_PLL, 0, &info);

                /* Based on VBIOS, VBIOS will keep entry for GPU PLL SS
                 * even if SS not enabled and in that case
                 * SSInfo.spreadSpectrumPercentage !=0 would be sign
                 * that SS is enabled
                 */
                if (result == BP_RESULT_OK &&
                                info.spread_spectrum_percentage != 0) {
                        clk_mgr_dce->ss_on_dprefclk = true;
                        clk_mgr_dce->dprefclk_ss_divider = info.spread_percentage_divider;

                        if (info.type.CENTER_MODE == 0) {
                                /* TODO: Currently for DP Reference clock we
                                 * need only SS percentage for
                                 * downspread */
                                clk_mgr_dce->dprefclk_ss_percentage =
                                                info.spread_spectrum_percentage;
                        }

                        return;
                }

                result = bp->funcs->get_spread_spectrum_info(
                                bp, AS_SIGNAL_TYPE_DISPLAY_PORT, 0, &info);

                /* Based on VBIOS, VBIOS will keep entry for DPREFCLK SS
                 * even if SS not enabled and in that case
                 * SSInfo.spreadSpectrumPercentage !=0 would be sign
                 * that SS is enabled
                 */
                if (result == BP_RESULT_OK &&
                                info.spread_spectrum_percentage != 0) {
                        clk_mgr_dce->ss_on_dprefclk = true;
                        clk_mgr_dce->dprefclk_ss_divider = info.spread_percentage_divider;

                        if (info.type.CENTER_MODE == 0) {
                                /* Currently for DP Reference clock we
                                 * need only SS percentage for
                                 * downspread */
                                clk_mgr_dce->dprefclk_ss_percentage =
                                                info.spread_spectrum_percentage;
                        }
                }
        }
}

/**
 * dce121_clock_patch_xgmi_ss_info() - Save XGMI spread spectrum info
 * @clk_mgr: clock manager base structure
 *
 * Reads from VBIOS the XGMI spread spectrum info and saves it within
 * the dce clock manager. This operation will overwrite the existing dprefclk
 * SS values if the vBIOS query succeeds. Otherwise, it does nothing. It also
 * sets the ->xgmi_enabled flag.
 */
void dce121_clock_patch_xgmi_ss_info(struct clk_mgr *clk_mgr)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        enum bp_result result;
        struct spread_spectrum_info info = { { 0 } };
        struct dc_bios *bp = clk_mgr_dce->base.ctx->dc_bios;

        clk_mgr_dce->xgmi_enabled = false;

        result = bp->funcs->get_spread_spectrum_info(bp, AS_SIGNAL_TYPE_XGMI,
                                                     0, &info);
        if (result == BP_RESULT_OK && info.spread_spectrum_percentage != 0) {
                clk_mgr_dce->xgmi_enabled = true;
                clk_mgr_dce->ss_on_dprefclk = true;
                clk_mgr_dce->dprefclk_ss_divider =
                                info.spread_percentage_divider;

                if (info.type.CENTER_MODE == 0) {
                        /* Currently for DP Reference clock we
                         * need only SS percentage for
                         * downspread */
                        clk_mgr_dce->dprefclk_ss_percentage =
                                        info.spread_spectrum_percentage;
                }
        }
}

void dce110_fill_display_configs(
        const struct dc_state *context,
        struct dm_pp_display_configuration *pp_display_cfg)
{
        int j;
        int num_cfgs = 0;

        for (j = 0; j < context->stream_count; j++) {
                int k;

                const struct dc_stream_state *stream = context->streams[j];
                struct dm_pp_single_disp_config *cfg =
                        &pp_display_cfg->disp_configs[num_cfgs];
                const struct pipe_ctx *pipe_ctx = NULL;

                for (k = 0; k < MAX_PIPES; k++)
                        if (stream == context->res_ctx.pipe_ctx[k].stream) {
                                pipe_ctx = &context->res_ctx.pipe_ctx[k];
                                break;
                        }

                ASSERT(pipe_ctx != NULL);

                /* only notify active stream */
                if (stream->dpms_off)
                        continue;

                num_cfgs++;
                cfg->signal = pipe_ctx->stream->signal;
                cfg->pipe_idx = pipe_ctx->stream_res.tg->inst;
                cfg->src_height = stream->src.height;
                cfg->src_width = stream->src.width;
                cfg->ddi_channel_mapping =
                        stream->link->ddi_channel_mapping.raw;
                cfg->transmitter =
                        stream->link->link_enc->transmitter;
                cfg->link_settings.lane_count =
                        stream->link->cur_link_settings.lane_count;
                cfg->link_settings.link_rate =
                        stream->link->cur_link_settings.link_rate;
                cfg->link_settings.link_spread =
                        stream->link->cur_link_settings.link_spread;
                cfg->sym_clock = stream->phy_pix_clk;
                /* Round v_refresh*/
                cfg->v_refresh = stream->timing.pix_clk_100hz * 100;
                cfg->v_refresh /= stream->timing.h_total;
                cfg->v_refresh = (cfg->v_refresh + stream->timing.v_total / 2)
                                                        / stream->timing.v_total;
        }

        pp_display_cfg->display_count = num_cfgs;
}

static uint32_t dce110_get_min_vblank_time_us(const struct dc_state *context)
{
        uint8_t j;
        uint32_t min_vertical_blank_time = -1;

        for (j = 0; j < context->stream_count; j++) {
                struct dc_stream_state *stream = context->streams[j];
                uint32_t vertical_blank_in_pixels = 0;
                uint32_t vertical_blank_time = 0;

                vertical_blank_in_pixels = stream->timing.h_total *
                        (stream->timing.v_total
                         - stream->timing.v_addressable);

                vertical_blank_time = vertical_blank_in_pixels
                        * 10000 / stream->timing.pix_clk_100hz;

                if (min_vertical_blank_time > vertical_blank_time)
                        min_vertical_blank_time = vertical_blank_time;
        }

        return min_vertical_blank_time;
}

static int determine_sclk_from_bounding_box(
                const struct dc *dc,
                int required_sclk)
{
        int i;

        /*
         * Some asics do not give us sclk levels, so we just report the actual
         * required sclk
         */
        if (dc->sclk_lvls.num_levels == 0)
                return required_sclk;

        for (i = 0; i < dc->sclk_lvls.num_levels; i++) {
                if (dc->sclk_lvls.clocks_in_khz[i] >= required_sclk)
                        return dc->sclk_lvls.clocks_in_khz[i];
        }
        /*
         * even maximum level could not satisfy requirement, this
         * is unexpected at this stage, should have been caught at
         * validation time
         */
        ASSERT(0);
        return dc->sclk_lvls.clocks_in_khz[dc->sclk_lvls.num_levels - 1];
}

static void dce_pplib_apply_display_requirements(
        struct dc *dc,
        struct dc_state *context)
{
        struct dm_pp_display_configuration *pp_display_cfg = &context->pp_display_cfg;

        pp_display_cfg->avail_mclk_switch_time_us = dce110_get_min_vblank_time_us(context);

        dce110_fill_display_configs(context, pp_display_cfg);

        if (memcmp(&dc->current_state->pp_display_cfg, pp_display_cfg, sizeof(*pp_display_cfg)) !=  0)
                dm_pp_apply_display_requirements(dc->ctx, pp_display_cfg);
}

static void dce11_pplib_apply_display_requirements(
        struct dc *dc,
        struct dc_state *context)
{
        struct dm_pp_display_configuration *pp_display_cfg = &context->pp_display_cfg;

        pp_display_cfg->all_displays_in_sync =
                context->bw_ctx.bw.dce.all_displays_in_sync;
        pp_display_cfg->nb_pstate_switch_disable =
                        context->bw_ctx.bw.dce.nbp_state_change_enable == false;
        pp_display_cfg->cpu_cc6_disable =
                        context->bw_ctx.bw.dce.cpuc_state_change_enable == false;
        pp_display_cfg->cpu_pstate_disable =
                        context->bw_ctx.bw.dce.cpup_state_change_enable == false;
        pp_display_cfg->cpu_pstate_separation_time =
                        context->bw_ctx.bw.dce.blackout_recovery_time_us;

        pp_display_cfg->min_memory_clock_khz = context->bw_ctx.bw.dce.yclk_khz
                / MEMORY_TYPE_MULTIPLIER_CZ;

        pp_display_cfg->min_engine_clock_khz = determine_sclk_from_bounding_box(
                        dc,
                        context->bw_ctx.bw.dce.sclk_khz);

        /*
         * As workaround for >4x4K lightup set dcfclock to min_engine_clock value.
         * This is not required for less than 5 displays,
         * thus don't request decfclk in dc to avoid impact
         * on power saving.
         *
         */
        pp_display_cfg->min_dcfclock_khz = (context->stream_count > 4)?
                        pp_display_cfg->min_engine_clock_khz : 0;

        pp_display_cfg->min_engine_clock_deep_sleep_khz
                        = context->bw_ctx.bw.dce.sclk_deep_sleep_khz;

        pp_display_cfg->avail_mclk_switch_time_us =
                                                dce110_get_min_vblank_time_us(context);
        /* TODO: dce11.2*/
        pp_display_cfg->avail_mclk_switch_time_in_disp_active_us = 0;

        pp_display_cfg->disp_clk_khz = dc->res_pool->clk_mgr->clks.dispclk_khz;

        dce110_fill_display_configs(context, pp_display_cfg);

        /* TODO: is this still applicable?*/
        if (pp_display_cfg->display_count == 1) {
                const struct dc_crtc_timing *timing =
                        &context->streams[0]->timing;

                pp_display_cfg->crtc_index =
                        pp_display_cfg->disp_configs[0].pipe_idx;
                pp_display_cfg->line_time_in_us = timing->h_total * 10000 / timing->pix_clk_100hz;
        }

        if (memcmp(&dc->current_state->pp_display_cfg, pp_display_cfg, sizeof(*pp_display_cfg)) !=  0)
                dm_pp_apply_display_requirements(dc->ctx, pp_display_cfg);
}

static void dce_update_clocks(struct clk_mgr *clk_mgr,
                        struct dc_state *context,
                        bool safe_to_lower)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        struct dm_pp_power_level_change_request level_change_req;
        int patched_disp_clk = context->bw_ctx.bw.dce.dispclk_khz;

        /*TODO: W/A for dal3 linux, investigate why this works */
        if (!clk_mgr_dce->dfs_bypass_active)
                patched_disp_clk = patched_disp_clk * 115 / 100;

        level_change_req.power_level = dce_get_required_clocks_state(clk_mgr, context);
        /* get max clock state from PPLIB */
        if ((level_change_req.power_level < clk_mgr_dce->cur_min_clks_state && safe_to_lower)
                        || level_change_req.power_level > clk_mgr_dce->cur_min_clks_state) {
                if (dm_pp_apply_power_level_change_request(clk_mgr->ctx, &level_change_req))
                        clk_mgr_dce->cur_min_clks_state = level_change_req.power_level;
        }

        if (should_set_clock(safe_to_lower, patched_disp_clk, clk_mgr->clks.dispclk_khz)) {
                patched_disp_clk = dce_set_clock(clk_mgr, patched_disp_clk);
                clk_mgr->clks.dispclk_khz = patched_disp_clk;
        }
        dce_pplib_apply_display_requirements(clk_mgr->ctx->dc, context);
}

static void dce11_update_clocks(struct clk_mgr *clk_mgr,
                        struct dc_state *context,
                        bool safe_to_lower)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        struct dm_pp_power_level_change_request level_change_req;
        int patched_disp_clk = context->bw_ctx.bw.dce.dispclk_khz;

        /*TODO: W/A for dal3 linux, investigate why this works */
        if (!clk_mgr_dce->dfs_bypass_active)
                patched_disp_clk = patched_disp_clk * 115 / 100;

        level_change_req.power_level = dce_get_required_clocks_state(clk_mgr, context);
        /* get max clock state from PPLIB */
        if ((level_change_req.power_level < clk_mgr_dce->cur_min_clks_state && safe_to_lower)
                        || level_change_req.power_level > clk_mgr_dce->cur_min_clks_state) {
                if (dm_pp_apply_power_level_change_request(clk_mgr->ctx, &level_change_req))
                        clk_mgr_dce->cur_min_clks_state = level_change_req.power_level;
        }

        if (should_set_clock(safe_to_lower, patched_disp_clk, clk_mgr->clks.dispclk_khz)) {
                context->bw_ctx.bw.dce.dispclk_khz = dce_set_clock(clk_mgr, patched_disp_clk);
                clk_mgr->clks.dispclk_khz = patched_disp_clk;
        }
        dce11_pplib_apply_display_requirements(clk_mgr->ctx->dc, context);
}

static void dce112_update_clocks(struct clk_mgr *clk_mgr,
                        struct dc_state *context,
                        bool safe_to_lower)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        struct dm_pp_power_level_change_request level_change_req;
        int patched_disp_clk = context->bw_ctx.bw.dce.dispclk_khz;

        /*TODO: W/A for dal3 linux, investigate why this works */
        if (!clk_mgr_dce->dfs_bypass_active)
                patched_disp_clk = patched_disp_clk * 115 / 100;

        level_change_req.power_level = dce_get_required_clocks_state(clk_mgr, context);
        /* get max clock state from PPLIB */
        if ((level_change_req.power_level < clk_mgr_dce->cur_min_clks_state && safe_to_lower)
                        || level_change_req.power_level > clk_mgr_dce->cur_min_clks_state) {
                if (dm_pp_apply_power_level_change_request(clk_mgr->ctx, &level_change_req))
                        clk_mgr_dce->cur_min_clks_state = level_change_req.power_level;
        }

        if (should_set_clock(safe_to_lower, patched_disp_clk, clk_mgr->clks.dispclk_khz)) {
                patched_disp_clk = dce112_set_clock(clk_mgr, patched_disp_clk);
                clk_mgr->clks.dispclk_khz = patched_disp_clk;
        }
        dce11_pplib_apply_display_requirements(clk_mgr->ctx->dc, context);
}

static void dce12_update_clocks(struct clk_mgr *clk_mgr,
                        struct dc_state *context,
                        bool safe_to_lower)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(clk_mgr);
        struct dm_pp_clock_for_voltage_req clock_voltage_req = {0};
        int max_pix_clk = get_max_pixel_clock_for_all_paths(context);
        int patched_disp_clk = context->bw_ctx.bw.dce.dispclk_khz;

        /*TODO: W/A for dal3 linux, investigate why this works */
        if (!clk_mgr_dce->dfs_bypass_active)
                patched_disp_clk = patched_disp_clk * 115 / 100;

        if (should_set_clock(safe_to_lower, patched_disp_clk, clk_mgr->clks.dispclk_khz)) {
                clock_voltage_req.clk_type = DM_PP_CLOCK_TYPE_DISPLAY_CLK;
                /*
                 * When xGMI is enabled, the display clk needs to be adjusted
                 * with the WAFL link's SS percentage.
                 */
                if (clk_mgr_dce->xgmi_enabled)
                        patched_disp_clk = clk_mgr_adjust_dp_ref_freq_for_ss(
                                        clk_mgr_dce, patched_disp_clk);
                clock_voltage_req.clocks_in_khz = patched_disp_clk;
                clk_mgr->clks.dispclk_khz = dce112_set_clock(clk_mgr, patched_disp_clk);

                dm_pp_apply_clock_for_voltage_request(clk_mgr->ctx, &clock_voltage_req);
        }

        if (should_set_clock(safe_to_lower, max_pix_clk, clk_mgr->clks.phyclk_khz)) {
                clock_voltage_req.clk_type = DM_PP_CLOCK_TYPE_DISPLAYPHYCLK;
                clock_voltage_req.clocks_in_khz = max_pix_clk;
                clk_mgr->clks.phyclk_khz = max_pix_clk;

                dm_pp_apply_clock_for_voltage_request(clk_mgr->ctx, &clock_voltage_req);
        }
        dce11_pplib_apply_display_requirements(clk_mgr->ctx->dc, context);
}

static const struct clk_mgr_funcs dce120_funcs = {
        .get_dp_ref_clk_frequency = dce12_get_dp_ref_freq_khz,
        .update_clocks = dce12_update_clocks
};

static const struct clk_mgr_funcs dce112_funcs = {
        .get_dp_ref_clk_frequency = dce_get_dp_ref_freq_khz,
        .update_clocks = dce112_update_clocks
};

static const struct clk_mgr_funcs dce110_funcs = {
        .get_dp_ref_clk_frequency = dce_get_dp_ref_freq_khz,
        .update_clocks = dce11_update_clocks,
};

static const struct clk_mgr_funcs dce_funcs = {
        .get_dp_ref_clk_frequency = dce_get_dp_ref_freq_khz,
        .update_clocks = dce_update_clocks
};

static void dce_clk_mgr_construct(
        struct dce_clk_mgr *clk_mgr_dce,
        struct dc_context *ctx,
        const struct clk_mgr_registers *regs,
        const struct clk_mgr_shift *clk_shift,
        const struct clk_mgr_mask *clk_mask)
{
        struct clk_mgr *base = &clk_mgr_dce->base;
        struct dm_pp_static_clock_info static_clk_info = {0};

        base->ctx = ctx;
        base->funcs = &dce_funcs;

        clk_mgr_dce->regs = regs;
        clk_mgr_dce->clk_mgr_shift = clk_shift;
        clk_mgr_dce->clk_mgr_mask = clk_mask;

        clk_mgr_dce->dfs_bypass_disp_clk = 0;

        clk_mgr_dce->dprefclk_ss_percentage = 0;
        clk_mgr_dce->dprefclk_ss_divider = 1000;
        clk_mgr_dce->ss_on_dprefclk = false;


        if (dm_pp_get_static_clocks(ctx, &static_clk_info))
                clk_mgr_dce->max_clks_state = static_clk_info.max_clocks_state;
        else
                clk_mgr_dce->max_clks_state = DM_PP_CLOCKS_STATE_NOMINAL;
        clk_mgr_dce->cur_min_clks_state = DM_PP_CLOCKS_STATE_INVALID;

        dce_clock_read_integrated_info(clk_mgr_dce);
        dce_clock_read_ss_info(clk_mgr_dce);
}

struct clk_mgr *dce_clk_mgr_create(
        struct dc_context *ctx,
        const struct clk_mgr_registers *regs,
        const struct clk_mgr_shift *clk_shift,
        const struct clk_mgr_mask *clk_mask)
{
        struct dce_clk_mgr *clk_mgr_dce = kzalloc(sizeof(*clk_mgr_dce), GFP_KERNEL);

        if (clk_mgr_dce == NULL) {
                BREAK_TO_DEBUGGER();
                return NULL;
        }

        memcpy(clk_mgr_dce->max_clks_by_state,
                dce80_max_clks_by_state,
                sizeof(dce80_max_clks_by_state));

        dce_clk_mgr_construct(
                clk_mgr_dce, ctx, regs, clk_shift, clk_mask);

        return &clk_mgr_dce->base;
}

struct clk_mgr *dce110_clk_mgr_create(
        struct dc_context *ctx,
        const struct clk_mgr_registers *regs,
        const struct clk_mgr_shift *clk_shift,
        const struct clk_mgr_mask *clk_mask)
{
        struct dce_clk_mgr *clk_mgr_dce = kzalloc(sizeof(*clk_mgr_dce), GFP_KERNEL);

        if (clk_mgr_dce == NULL) {
                BREAK_TO_DEBUGGER();
                return NULL;
        }

        memcpy(clk_mgr_dce->max_clks_by_state,
                dce110_max_clks_by_state,
                sizeof(dce110_max_clks_by_state));

        dce_clk_mgr_construct(
                clk_mgr_dce, ctx, regs, clk_shift, clk_mask);

        clk_mgr_dce->base.funcs = &dce110_funcs;

        return &clk_mgr_dce->base;
}

struct clk_mgr *dce112_clk_mgr_create(
        struct dc_context *ctx,
        const struct clk_mgr_registers *regs,
        const struct clk_mgr_shift *clk_shift,
        const struct clk_mgr_mask *clk_mask)
{
        struct dce_clk_mgr *clk_mgr_dce = kzalloc(sizeof(*clk_mgr_dce), GFP_KERNEL);

        if (clk_mgr_dce == NULL) {
                BREAK_TO_DEBUGGER();
                return NULL;
        }

        memcpy(clk_mgr_dce->max_clks_by_state,
                dce112_max_clks_by_state,
                sizeof(dce112_max_clks_by_state));

        dce_clk_mgr_construct(
                clk_mgr_dce, ctx, regs, clk_shift, clk_mask);

        clk_mgr_dce->base.funcs = &dce112_funcs;

        return &clk_mgr_dce->base;
}

struct clk_mgr *dce120_clk_mgr_create(struct dc_context *ctx)
{
        struct dce_clk_mgr *clk_mgr_dce = kzalloc(sizeof(*clk_mgr_dce), GFP_KERNEL);

        if (clk_mgr_dce == NULL) {
                BREAK_TO_DEBUGGER();
                return NULL;
        }

        memcpy(clk_mgr_dce->max_clks_by_state,
                dce120_max_clks_by_state,
                sizeof(dce120_max_clks_by_state));

        dce_clk_mgr_construct(
                clk_mgr_dce, ctx, NULL, NULL, NULL);

        clk_mgr_dce->dprefclk_khz = 600000;
        clk_mgr_dce->base.funcs = &dce120_funcs;

        return &clk_mgr_dce->base;
}

struct clk_mgr *dce121_clk_mgr_create(struct dc_context *ctx)
{
        struct dce_clk_mgr *clk_mgr_dce = kzalloc(sizeof(*clk_mgr_dce),
                                                  GFP_KERNEL);

        if (clk_mgr_dce == NULL) {
                BREAK_TO_DEBUGGER();
                return NULL;
        }

        memcpy(clk_mgr_dce->max_clks_by_state, dce120_max_clks_by_state,
               sizeof(dce120_max_clks_by_state));

        dce_clk_mgr_construct(clk_mgr_dce, ctx, NULL, NULL, NULL);

        clk_mgr_dce->dprefclk_khz = 625000;
        clk_mgr_dce->base.funcs = &dce120_funcs;

        return &clk_mgr_dce->base;
}

void dce_clk_mgr_destroy(struct clk_mgr **clk_mgr)
{
        struct dce_clk_mgr *clk_mgr_dce = TO_DCE_CLK_MGR(*clk_mgr);

        kfree(clk_mgr_dce);
        *clk_mgr = NULL;
}