/*
 * Copyright 2012-14 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
 *
 */

#ifndef DC_LINK_H_
#define DC_LINK_H_

#include "dc.h"
#include "dc_types.h"
#include "grph_object_defs.h"

enum dc_link_fec_state {
        dc_link_fec_not_ready,
        dc_link_fec_ready,
        dc_link_fec_enabled
};

struct dc_link_status {
        bool link_active;
        struct dpcd_caps *dpcd_caps;
};

/* DP MST stream allocation (payload bandwidth number) */
struct link_mst_stream_allocation {
        /* DIG front */
        const struct stream_encoder *stream_enc;
        /* associate DRM payload table with DC stream encoder */
        uint8_t vcp_id;
        /* number of slots required for the DP stream in transport packet */
        uint8_t slot_count;
};

/* DP MST stream allocation table */
struct link_mst_stream_allocation_table {
        /* number of DP video streams */
        int stream_count;
        /* array of stream allocations */
        struct link_mst_stream_allocation stream_allocations[MAX_CONTROLLER_NUM];
};

struct time_stamp {
        uint64_t edp_poweroff;
        uint64_t edp_poweron;
};

struct link_trace {
        struct time_stamp time_stamp;
};

/* PSR feature flags */
struct psr_settings {
        bool psr_feature_enabled;               // PSR is supported by sink
        bool psr_allow_active;                  // PSR is currently active
        enum dc_psr_version psr_version;                // Internal PSR version, determined based on DPCD

        /* These parameters are calculated in Driver,
         * based on display timing and Sink capabilities.
         * If VBLANK region is too small and Sink takes a long time
         * to set up RFB, it may take an extra frame to enter PSR state.
         */
        bool psr_frame_capture_indication_req;
        unsigned int psr_sdp_transmit_line_num_deadline;
};

/*
 * A link contains one or more sinks and their connected status.
 * The currently active signal type (HDMI, DP-SST, DP-MST) is also reported.
 */
struct dc_link {
        struct dc_sink *remote_sinks[MAX_SINKS_PER_LINK];
        unsigned int sink_count;
        struct dc_sink *local_sink;
        unsigned int link_index;
        enum dc_connection_type type;
        enum signal_type connector_signal;
        enum dc_irq_source irq_source_hpd;
        enum dc_irq_source irq_source_hpd_rx;/* aka DP Short Pulse  */
        bool is_hpd_filter_disabled;
        bool dp_ss_off;
        bool link_state_valid;
        bool aux_access_disabled;
        bool sync_lt_in_progress;
        enum lttpr_mode lttpr_mode;
        bool is_internal_display;

        /* TODO: Rename. Flag an endpoint as having a programmable mapping to a
         * DIG encoder. */
        bool is_dig_mapping_flexible;
        bool hpd_status; /* HPD status of link without physical HPD pin. */

        bool edp_sink_present;

        /* caps is the same as reported_link_cap. link_traing use
         * reported_link_cap. Will clean up.  TODO
         */
        struct dc_link_settings reported_link_cap;
        struct dc_link_settings verified_link_cap;
        struct dc_link_settings cur_link_settings;
        struct dc_lane_settings cur_lane_setting;
        struct dc_link_settings preferred_link_setting;
        struct dc_link_training_overrides preferred_training_settings;
        struct dp_audio_test_data audio_test_data;

        uint8_t ddc_hw_inst;

        uint8_t hpd_src;

        uint8_t link_enc_hw_inst;
        /* DIG link encoder ID. Used as index in link encoder resource pool.
         * For links with fixed mapping to DIG, this is not changed after dc_link
         * object creation.
         */
        enum engine_id eng_id;

        bool test_pattern_enabled;
        union compliance_test_state compliance_test_state;

        void *priv;

        struct ddc_service *ddc;

        bool aux_mode;

        /* Private to DC core */

        const struct dc *dc;

        struct dc_context *ctx;

        struct panel_cntl *panel_cntl;
        struct link_encoder *link_enc;
        struct graphics_object_id link_id;
        /* Endpoint type distinguishes display endpoints which do not have entries
         * in the BIOS connector table from those that do. Helps when tracking link
         * encoder to display endpoint assignments.
         */
        enum display_endpoint_type ep_type;
        union ddi_channel_mapping ddi_channel_mapping;
        struct connector_device_tag_info device_tag;
        struct dpcd_caps dpcd_caps;
        uint32_t dongle_max_pix_clk;
        unsigned short chip_caps;
        unsigned int dpcd_sink_count;
#if defined(CONFIG_DRM_AMD_DC_HDCP)
        struct hdcp_caps hdcp_caps;
#endif
        enum edp_revision edp_revision;
        union dpcd_sink_ext_caps dpcd_sink_ext_caps;

        struct psr_settings psr_settings;

        /* MST record stream using this link */
        struct link_flags {
                bool dp_keep_receiver_powered;
                bool dp_skip_DID2;
                bool dp_skip_reset_segment;
        } wa_flags;
        struct link_mst_stream_allocation_table mst_stream_alloc_table;

        struct dc_link_status link_status;

        struct link_trace link_trace;
        struct gpio *hpd_gpio;
        enum dc_link_fec_state fec_state;
};

const struct dc_link_status *dc_link_get_status(const struct dc_link *dc_link);

/**
 * dc_get_link_at_index() - Return an enumerated dc_link.
 *
 * dc_link order is constant and determined at
 * boot time.  They cannot be created or destroyed.
 * Use dc_get_caps() to get number of links.
 */
static inline struct dc_link *dc_get_link_at_index(struct dc *dc, uint32_t link_index)
{
        return dc->links[link_index];
}

static inline void get_edp_links(const struct dc *dc,
                struct dc_link **edp_links,
                int *edp_num)
{
        int i;

        *edp_num = 0;
        for (i = 0; i < dc->link_count; i++) {
                // report any eDP links, even unconnected DDI's
                if (dc->links[i]->connector_signal == SIGNAL_TYPE_EDP) {
                        edp_links[*edp_num] = dc->links[i];
                        if (++(*edp_num) == MAX_NUM_EDP)
                                return;
                }
        }
}

static inline bool dc_get_edp_link_panel_inst(const struct dc *dc,
                const struct dc_link *link,
                unsigned int *inst_out)
{
        struct dc_link *edp_links[MAX_NUM_EDP];
        int edp_num;

        if (link->connector_signal != SIGNAL_TYPE_EDP)
                return false;
        get_edp_links(dc, edp_links, &edp_num);
        if ((edp_num > 1) && (link->link_index > edp_links[0]->link_index))
                *inst_out = 1;
        else
                *inst_out = 0;
        return true;
}

/* Set backlight level of an embedded panel (eDP, LVDS).
 * backlight_pwm_u16_16 is unsigned 32 bit with 16 bit integer
 * and 16 bit fractional, where 1.0 is max backlight value.
 */
bool dc_link_set_backlight_level(const struct dc_link *dc_link,
                uint32_t backlight_pwm_u16_16,
                uint32_t frame_ramp);

/* Set/get nits-based backlight level of an embedded panel (eDP, LVDS). */
bool dc_link_set_backlight_level_nits(struct dc_link *link,
                bool isHDR,
                uint32_t backlight_millinits,
                uint32_t transition_time_in_ms);

bool dc_link_get_backlight_level_nits(struct dc_link *link,
                uint32_t *backlight_millinits,
                uint32_t *backlight_millinits_peak);

bool dc_link_backlight_enable_aux(struct dc_link *link, bool enable);

bool dc_link_read_default_bl_aux(struct dc_link *link, uint32_t *backlight_millinits);
bool dc_link_set_default_brightness_aux(struct dc_link *link);

int dc_link_get_backlight_level(const struct dc_link *dc_link);

int dc_link_get_target_backlight_pwm(const struct dc_link *link);

bool dc_link_set_psr_allow_active(struct dc_link *dc_link, bool enable,
                bool wait, bool force_static);

bool dc_link_get_psr_state(const struct dc_link *dc_link, enum dc_psr_state *state);

bool dc_link_setup_psr(struct dc_link *dc_link,
                const struct dc_stream_state *stream, struct psr_config *psr_config,
                struct psr_context *psr_context);

void dc_link_get_psr_residency(const struct dc_link *link, uint32_t *residency);

/* Request DC to detect if there is a Panel connected.
 * boot - If this call is during initial boot.
 * Return false for any type of detection failure or MST detection
 * true otherwise. True meaning further action is required (status update
 * and OS notification).
 */
enum dc_detect_reason {
        DETECT_REASON_BOOT,
        DETECT_REASON_HPD,
        DETECT_REASON_HPDRX,
        DETECT_REASON_FALLBACK,
        DETECT_REASON_RETRAIN
};

bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason);
bool dc_link_get_hpd_state(struct dc_link *dc_link);
enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx);

/* Notify DC about DP RX Interrupt (aka Short Pulse Interrupt).
 * Return:
 * true - Downstream port status changed. DM should call DC to do the
 * detection.
 * false - no change in Downstream port status. No further action required
 * from DM. */
bool dc_link_handle_hpd_rx_irq(struct dc_link *dc_link,
                union hpd_irq_data *hpd_irq_dpcd_data, bool *out_link_loss);

/*
 * On eDP links this function call will stall until T12 has elapsed.
 * If the panel is not in power off state, this function will return
 * immediately.
 */
bool dc_link_wait_for_t12(struct dc_link *link);

enum dc_status read_hpd_rx_irq_data(
        struct dc_link *link,
        union hpd_irq_data *irq_data);

struct dc_sink_init_data;

struct dc_sink *dc_link_add_remote_sink(
                struct dc_link *dc_link,
                const uint8_t *edid,
                int len,
                struct dc_sink_init_data *init_data);

void dc_link_remove_remote_sink(
        struct dc_link *link,
        struct dc_sink *sink);

/* Used by diagnostics for virtual link at the moment */

void dc_link_dp_set_drive_settings(
        struct dc_link *link,
        struct link_training_settings *lt_settings);

bool dc_link_dp_perform_link_training_skip_aux(
        struct dc_link *link,
        const struct dc_link_settings *link_setting);

enum link_training_result dc_link_dp_perform_link_training(
        struct dc_link *link,
        const struct dc_link_settings *link_settings,
        bool skip_video_pattern);

bool dc_link_dp_sync_lt_begin(struct dc_link *link);

enum link_training_result dc_link_dp_sync_lt_attempt(
        struct dc_link *link,
        struct dc_link_settings *link_setting,
        struct dc_link_training_overrides *lt_settings);

bool dc_link_dp_sync_lt_end(struct dc_link *link, bool link_down);

void dc_link_dp_enable_hpd(const struct dc_link *link);

void dc_link_dp_disable_hpd(const struct dc_link *link);

bool dc_link_dp_set_test_pattern(
        struct dc_link *link,
        enum dp_test_pattern test_pattern,
        enum dp_test_pattern_color_space test_pattern_color_space,
        const struct link_training_settings *p_link_settings,
        const unsigned char *p_custom_pattern,
        unsigned int cust_pattern_size);

bool dc_link_dp_get_max_link_enc_cap(const struct dc_link *link, struct dc_link_settings *max_link_enc_cap);

void dc_link_enable_hpd_filter(struct dc_link *link, bool enable);

bool dc_link_is_dp_sink_present(struct dc_link *link);

bool dc_link_detect_sink(struct dc_link *link, enum dc_connection_type *type);
/*
 * DPCD access interfaces
 */

#ifdef CONFIG_DRM_AMD_DC_HDCP
bool dc_link_is_hdcp14(struct dc_link *link, enum signal_type signal);
bool dc_link_is_hdcp22(struct dc_link *link, enum signal_type signal);
#endif
void dc_link_set_drive_settings(struct dc *dc,
                                struct link_training_settings *lt_settings,
                                const struct dc_link *link);
void dc_link_set_preferred_link_settings(struct dc *dc,
                                         struct dc_link_settings *link_setting,
                                         struct dc_link *link);
void dc_link_set_preferred_training_settings(struct dc *dc,
                                        struct dc_link_settings *link_setting,
                                        struct dc_link_training_overrides *lt_overrides,
                                        struct dc_link *link,
                                        bool skip_immediate_retrain);
void dc_link_enable_hpd(const struct dc_link *link);
void dc_link_disable_hpd(const struct dc_link *link);
void dc_link_set_test_pattern(struct dc_link *link,
                        enum dp_test_pattern test_pattern,
                        enum dp_test_pattern_color_space test_pattern_color_space,
                        const struct link_training_settings *p_link_settings,
                        const unsigned char *p_custom_pattern,
                        unsigned int cust_pattern_size);
uint32_t dc_link_bandwidth_kbps(
        const struct dc_link *link,
        const struct dc_link_settings *link_setting);

const struct dc_link_settings *dc_link_get_link_cap(
                const struct dc_link *link);

void dc_link_overwrite_extended_receiver_cap(
                struct dc_link *link);

bool dc_submit_i2c(
                struct dc *dc,
                uint32_t link_index,
                struct i2c_command *cmd);

bool dc_submit_i2c_oem(
                struct dc *dc,
                struct i2c_command *cmd);

uint32_t dc_bandwidth_in_kbps_from_timing(
        const struct dc_crtc_timing *timing);

bool dc_link_is_fec_supported(const struct dc_link *link);
bool dc_link_should_enable_fec(const struct dc_link *link);

#endif /* DC_LINK_H_ */