dc.h

/*
 * 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_INTERFACE_H_
#define DC_INTERFACE_H_

#include "dc_types.h"
#include "grph_object_defs.h"
#include "logger_types.h"
#include "gpio_types.h"
#include "link_service_types.h"
#include "grph_object_ctrl_defs.h"
#include <inc/hw/opp.h>

#include "inc/hw_sequencer.h"
#include "inc/compressor.h"
#include "dml/display_mode_lib.h"

#define DC_VER "3.1.03"

#define MAX_SURFACES 3
#define MAX_STREAMS 6
#define MAX_SINKS_PER_LINK 4


/*******************************************************************************
 * Display Core Interfaces
 ******************************************************************************/
struct dc_caps {
	uint32_t max_streams;
	uint32_t max_links;
	uint32_t max_audios;
	uint32_t max_slave_planes;
	uint32_t max_planes;
	uint32_t max_downscale_ratio;
	uint32_t i2c_speed_in_khz;
	unsigned int max_cursor_size;
	bool dcc_const_color;
};

struct dc_dcc_surface_param {
	struct dc_size surface_size;
	enum surface_pixel_format format;
	enum swizzle_mode_values swizzle_mode;
	enum dc_scan_direction scan;
};

struct dc_dcc_setting {
	unsigned int max_compressed_blk_size;
	unsigned int max_uncompressed_blk_size;
	bool independent_64b_blks;
};

struct dc_surface_dcc_cap {
	union {
		struct {
			struct dc_dcc_setting rgb;
		} grph;

		struct {
			struct dc_dcc_setting luma;
			struct dc_dcc_setting chroma;
		} video;
	};

	bool capable;
	bool const_color_support;
};

struct dc_static_screen_events {
	bool cursor_update;
	bool surface_update;
	bool overlay_update;
};

/* Forward declaration*/
struct dc;
struct dc_plane_state;
struct dc_state;

struct dc_cap_funcs {
	bool (*get_dcc_compression_cap)(const struct dc *dc,
			const struct dc_dcc_surface_param *input,
			struct dc_surface_dcc_cap *output);
};

struct dc_stream_state_funcs {
	bool (*adjust_vmin_vmax)(struct dc *dc,
			struct dc_stream_state **stream,
			int num_streams,
			int vmin,
			int vmax);
	bool (*get_crtc_position)(struct dc *dc,
			struct dc_stream_state **stream,
			int num_streams,
			unsigned int *v_pos,
			unsigned int *nom_v_pos);

	bool (*set_gamut_remap)(struct dc *dc,
			const struct dc_stream_state *stream);

	bool (*program_csc_matrix)(struct dc *dc,
			struct dc_stream_state *stream);

	void (*set_static_screen_events)(struct dc *dc,
			struct dc_stream_state **stream,
			int num_streams,
			const struct dc_static_screen_events *events);

	void (*set_dither_option)(struct dc_stream_state *stream,
			enum dc_dither_option option);
};

struct link_training_settings;

struct dc_link_funcs {
	void (*set_drive_settings)(struct dc *dc,
			struct link_training_settings *lt_settings,
			const struct dc_link *link);
	void (*perform_link_training)(struct dc *dc,
			struct dc_link_settings *link_setting,
			bool skip_video_pattern);
	void (*set_preferred_link_settings)(struct dc *dc,
			struct dc_link_settings *link_setting,
			struct dc_link *link);
	void (*enable_hpd)(const struct dc_link *link);
	void (*disable_hpd)(const struct dc_link *link);
	void (*set_test_pattern)(
			struct dc_link *link,
			enum dp_test_pattern test_pattern,
			const struct link_training_settings *p_link_settings,
			const unsigned char *p_custom_pattern,
			unsigned int cust_pattern_size);
};

/* Structure to hold configuration flags set by dm at dc creation. */
struct dc_config {
	bool gpu_vm_support;
	bool disable_disp_pll_sharing;
};

enum dcc_option {
	DCC_ENABLE = 0,
	DCC_DISABLE = 1,
	DCC_HALF_REQ_DISALBE = 2,
};

enum pipe_split_policy {
	MPC_SPLIT_DYNAMIC = 0,
	MPC_SPLIT_AVOID = 1,
	MPC_SPLIT_AVOID_MULT_DISP = 2,
};

struct dc_debug {
	bool surface_visual_confirm;
	bool sanity_checks;
	bool max_disp_clk;
	bool surface_trace;
	bool timing_trace;
	bool clock_trace;
	bool validation_trace;

	/* stutter efficiency related */
	bool disable_stutter;
	bool use_max_lb;
	enum dcc_option disable_dcc;
	enum pipe_split_policy pipe_split_policy;
	bool force_single_disp_pipe_split;
	bool voltage_align_fclk;

	bool disable_dfs_bypass;
	bool disable_dpp_power_gate;
	bool disable_hubp_power_gate;
	bool disable_pplib_wm_range;
	bool use_dml_wm;
	unsigned int min_disp_clk_khz;
	int sr_exit_time_dpm0_ns;
	int sr_enter_plus_exit_time_dpm0_ns;
	int sr_exit_time_ns;
	int sr_enter_plus_exit_time_ns;
	int urgent_latency_ns;
	int percent_of_ideal_drambw;
	int dram_clock_change_latency_ns;
	int always_scale;
	bool disable_pplib_clock_request;
	bool disable_clock_gate;
	bool disable_dmcu;
	bool disable_psr;
	bool force_abm_enable;
	bool disable_hbup_pg;
	bool disable_dpp_pg;
};
struct dc_state;
struct resource_pool;
struct dce_hwseq;
struct dc {
	struct dc_caps caps;
	struct dc_cap_funcs cap_funcs;
	struct dc_stream_state_funcs stream_funcs;
	struct dc_link_funcs link_funcs;
	struct dc_config config;
	struct dc_debug debug;

	struct dc_context *ctx;

	uint8_t link_count;
	struct dc_link *links[MAX_PIPES * 2];

	struct dc_state *current_state;
	struct resource_pool *res_pool;

	/* Display Engine Clock levels */
	struct dm_pp_clock_levels sclk_lvls;

	/* Inputs into BW and WM calculations. */
	struct bw_calcs_dceip *bw_dceip;
	struct bw_calcs_vbios *bw_vbios;
#ifdef CONFIG_DRM_AMD_DC_DCN1_0
	struct dcn_soc_bounding_box *dcn_soc;
	struct dcn_ip_params *dcn_ip;
	struct display_mode_lib dml;
#endif

	/* HW functions */
	struct hw_sequencer_funcs hwss;
	struct dce_hwseq *hwseq;

	/* temp store of dm_pp_display_configuration
	 * to compare to see if display config changed
	 */
	struct dm_pp_display_configuration prev_display_config;

	/* FBC compressor */
#ifdef ENABLE_FBC
	struct compressor *fbc_compressor;
#endif
};

enum frame_buffer_mode {
	FRAME_BUFFER_MODE_LOCAL_ONLY = 0,
	FRAME_BUFFER_MODE_ZFB_ONLY,
	FRAME_BUFFER_MODE_MIXED_ZFB_AND_LOCAL,
} ;

struct dchub_init_data {
	int64_t zfb_phys_addr_base;
	int64_t zfb_mc_base_addr;
	uint64_t zfb_size_in_byte;
	enum frame_buffer_mode fb_mode;
	bool dchub_initialzied;
	bool dchub_info_valid;
};

struct dc_init_data {
	struct hw_asic_id asic_id;
	void *driver; /* ctx */
	struct cgs_device *cgs_device;

	int num_virtual_links;
	/*
	 * If 'vbios_override' not NULL, it will be called instead
	 * of the real VBIOS. Intended use is Diagnostics on FPGA.
	 */
	struct dc_bios *vbios_override;
	enum dce_environment dce_environment;

	struct dc_config flags;
	uint32_t log_mask;
#ifdef ENABLE_FBC
	uint64_t fbc_gpu_addr;
#endif
};

struct dc *dc_create(const struct dc_init_data *init_params);

void dc_destroy(struct dc **dc);

/*******************************************************************************
 * Surface Interfaces
 ******************************************************************************/

enum {
	TRANSFER_FUNC_POINTS = 1025
};

struct dc_hdr_static_metadata {
	/* display chromaticities and white point in units of 0.00001 */
	unsigned int chromaticity_green_x;
	unsigned int chromaticity_green_y;
	unsigned int chromaticity_blue_x;
	unsigned int chromaticity_blue_y;
	unsigned int chromaticity_red_x;
	unsigned int chromaticity_red_y;
	unsigned int chromaticity_white_point_x;
	unsigned int chromaticity_white_point_y;

	uint32_t min_luminance;
	uint32_t max_luminance;
	uint32_t maximum_content_light_level;
	uint32_t maximum_frame_average_light_level;

	bool hdr_supported;
	bool is_hdr;
};

enum dc_transfer_func_type {
	TF_TYPE_PREDEFINED,
	TF_TYPE_DISTRIBUTED_POINTS,
	TF_TYPE_BYPASS
};

struct dc_transfer_func_distributed_points {
	struct fixed31_32 red[TRANSFER_FUNC_POINTS];
	struct fixed31_32 green[TRANSFER_FUNC_POINTS];
	struct fixed31_32 blue[TRANSFER_FUNC_POINTS];

	uint16_t end_exponent;
	uint16_t x_point_at_y1_red;
	uint16_t x_point_at_y1_green;
	uint16_t x_point_at_y1_blue;
};

enum dc_transfer_func_predefined {
	TRANSFER_FUNCTION_SRGB,
	TRANSFER_FUNCTION_BT709,
	TRANSFER_FUNCTION_PQ,
	TRANSFER_FUNCTION_LINEAR,
};

struct dc_transfer_func {
	struct kref refcount;
	struct dc_transfer_func_distributed_points tf_pts;
	enum dc_transfer_func_type type;
	enum dc_transfer_func_predefined tf;
	struct dc_context *ctx;
};

/*
 * This structure is filled in by dc_surface_get_status and contains
 * the last requested address and the currently active address so the called
 * can determine if there are any outstanding flips
 */
struct dc_plane_status {
	struct dc_plane_address requested_address;
	struct dc_plane_address current_address;
	bool is_flip_pending;
	bool is_right_eye;
};

struct dc_plane_state {
	struct dc_plane_address address;
	struct scaling_taps scaling_quality;
	struct rect src_rect;
	struct rect dst_rect;
	struct rect clip_rect;

	union plane_size plane_size;
	union dc_tiling_info tiling_info;

	struct dc_plane_dcc_param dcc;
	struct dc_hdr_static_metadata hdr_static_ctx;

	struct dc_gamma *gamma_correction;
	struct dc_transfer_func *in_transfer_func;

	enum dc_color_space color_space;
	enum surface_pixel_format format;
	enum dc_rotation_angle rotation;
	enum plane_stereo_format stereo_format;

	bool per_pixel_alpha;
	bool visible;
	bool flip_immediate;
	bool horizontal_mirror;

	/* private to DC core */
	struct dc_plane_status status;
	struct dc_context *ctx;

	/* private to dc_surface.c */
	enum dc_irq_source irq_source;
	struct kref refcount;
};

struct dc_plane_info {
	union plane_size plane_size;
	union dc_tiling_info tiling_info;
	struct dc_plane_dcc_param dcc;
	enum surface_pixel_format format;
	enum dc_rotation_angle rotation;
	enum plane_stereo_format stereo_format;
	enum dc_color_space color_space; /*todo: wrong place, fits in scaling info*/
	bool horizontal_mirror;
	bool visible;
	bool per_pixel_alpha;
};

struct dc_scaling_info {
	struct rect src_rect;
	struct rect dst_rect;
	struct rect clip_rect;
	struct scaling_taps scaling_quality;
};

struct dc_surface_update {
	struct dc_plane_state *surface;

	/* isr safe update parameters.  null means no updates */
	struct dc_flip_addrs *flip_addr;
	struct dc_plane_info *plane_info;
	struct dc_scaling_info *scaling_info;
	/* following updates require alloc/sleep/spin that is not isr safe,
	 * null means no updates
	 */
	/* gamma TO BE REMOVED */
	struct dc_gamma *gamma;
	struct dc_transfer_func *in_transfer_func;
	struct dc_hdr_static_metadata *hdr_static_metadata;
};

/*
 * Create a new surface with default parameters;
 */
struct dc_plane_state *dc_create_plane_state(struct dc *dc);
const struct dc_plane_status *dc_plane_get_status(
		const struct dc_plane_state *plane_state);

void dc_plane_state_retain(struct dc_plane_state *plane_state);
void dc_plane_state_release(struct dc_plane_state *plane_state);

void dc_gamma_retain(struct dc_gamma *dc_gamma);
void dc_gamma_release(struct dc_gamma **dc_gamma);
struct dc_gamma *dc_create_gamma(void);

void dc_transfer_func_retain(struct dc_transfer_func *dc_tf);
void dc_transfer_func_release(struct dc_transfer_func *dc_tf);
struct dc_transfer_func *dc_create_transfer_func(void);

/*
 * This structure holds a surface address.  There could be multiple addresses
 * in cases such as Stereo 3D, Planar YUV, etc.  Other per-flip attributes such
 * as frame durations and DCC format can also be set.
 */
struct dc_flip_addrs {
	struct dc_plane_address address;
	bool flip_immediate;
	/* TODO: add flip duration for FreeSync */
};

bool dc_post_update_surfaces_to_stream(
		struct dc *dc);

/* Surface update type is used by dc_update_surfaces_and_stream
 * The update type is determined at the very beginning of the function based
 * on parameters passed in and decides how much programming (or updating) is
 * going to be done during the call.
 *
 * UPDATE_TYPE_FAST is used for really fast updates that do not require much
 * logical calculations or hardware register programming. This update MUST be
 * ISR safe on windows. Currently fast update will only be used to flip surface
 * address.
 *
 * UPDATE_TYPE_MED is used for slower updates which require significant hw
 * re-programming however do not affect bandwidth consumption or clock
 * requirements. At present, this is the level at which front end updates
 * that do not require us to run bw_calcs happen. These are in/out transfer func
 * updates, viewport offset changes, recout size changes and pixel depth changes.
 * This update can be done at ISR, but we want to minimize how often this happens.
 *
 * UPDATE_TYPE_FULL is slow. Really slow. This requires us to recalculate our
 * bandwidth and clocks, possibly rearrange some pipes and reprogram anything front
 * end related. Any time viewport dimensions, recout dimensions, scaling ratios or
 * gamma need to be adjusted or pipe needs to be turned on (or disconnected) we do
 * a full update. This cannot be done at ISR level and should be a rare event.
 * Unless someone is stress testing mpo enter/exit, playing with colour or adjusting
 * underscan we don't expect to see this call at all.
 */

enum surface_update_type {
	UPDATE_TYPE_FAST, /* super fast, safe to execute in isr */
	UPDATE_TYPE_MED,  /* ISR safe, most of programming needed, no bw/clk change*/
	UPDATE_TYPE_FULL, /* may need to shuffle resources */
};

/*******************************************************************************
 * Stream Interfaces
 ******************************************************************************/

struct dc_stream_status {
	int primary_otg_inst;
	int stream_enc_inst;
	int plane_count;
	struct dc_plane_state *plane_states[MAX_SURFACE_NUM];

	/*
	 * link this stream passes through
	 */
	struct dc_link *link;
};

struct dc_stream_state {
	struct dc_sink *sink;
	struct dc_crtc_timing timing;

	struct rect src; /* composition area */
	struct rect dst; /* stream addressable area */

	struct audio_info audio_info;

	struct freesync_context freesync_ctx;

	struct dc_transfer_func *out_transfer_func;
	struct colorspace_transform gamut_remap_matrix;
	struct csc_transform csc_color_matrix;

	enum signal_type output_signal;

	enum dc_color_space output_color_space;
	enum dc_dither_option dither_option;

	enum view_3d_format view_format;

	bool ignore_msa_timing_param;
	/* TODO: custom INFO packets */
	/* TODO: ABM info (DMCU) */
	/* TODO: PSR info */
	/* TODO: CEA VIC */

	/* from core_stream struct */
	struct dc_context *ctx;

	/* used by DCP and FMT */
	struct bit_depth_reduction_params bit_depth_params;
	struct clamping_and_pixel_encoding_params clamping;

	int phy_pix_clk;
	enum signal_type signal;

	struct dc_stream_status status;

	/* from stream struct */
	struct kref refcount;
};

struct dc_stream_update {
	struct rect src;
	struct rect dst;
	struct dc_transfer_func *out_transfer_func;
};

bool dc_is_stream_unchanged(
	struct dc_stream_state *old_stream, struct dc_stream_state *stream);

/*
 * Set up surface attributes and associate to a stream
 * The surfaces parameter is an absolute set of all surface active for the stream.
 * If no surfaces are provided, the stream will be blanked; no memory read.
 * Any flip related attribute changes must be done through this interface.
 *
 * After this call:
 *   Surfaces attributes are programmed and configured to be composed into stream.
 *   This does not trigger a flip.  No surface address is programmed.
 */

bool dc_commit_planes_to_stream(
		struct dc *dc,
		struct dc_plane_state **plane_states,
		uint8_t new_plane_count,
		struct dc_stream_state *dc_stream,
		struct dc_state *state);

void dc_commit_updates_for_stream(struct dc *dc,
		struct dc_surface_update *srf_updates,
		int surface_count,
		struct dc_stream_state *stream,
		struct dc_stream_update *stream_update,
		struct dc_plane_state **plane_states,
		struct dc_state *state);
/*
 * Log the current stream state.
 */
void dc_stream_log(
	const struct dc_stream_state *stream,
	struct dal_logger *dc_logger,
	enum dc_log_type log_type);

uint8_t dc_get_current_stream_count(struct dc *dc);
struct dc_stream_state *dc_get_stream_at_index(struct dc *dc, uint8_t i);

/*
 * Return the current frame counter.
 */
uint32_t dc_stream_get_vblank_counter(const struct dc_stream_state *stream);

/* TODO: Return parsed values rather than direct register read
 * This has a dependency on the caller (amdgpu_get_crtc_scanoutpos)
 * being refactored properly to be dce-specific
 */
bool dc_stream_get_scanoutpos(const struct dc_stream_state *stream,
				  uint32_t *v_blank_start,
				  uint32_t *v_blank_end,
				  uint32_t *h_position,
				  uint32_t *v_position);

bool dc_add_stream_to_ctx(
			struct dc *dc,
		struct dc_state *new_ctx,
		struct dc_stream_state *stream);

bool dc_remove_stream_from_ctx(
		struct dc *dc,
			struct dc_state *new_ctx,
			struct dc_stream_state *stream);


bool dc_add_plane_to_context(
		const struct dc *dc,
		struct dc_stream_state *stream,
		struct dc_plane_state *plane_state,
		struct dc_state *context);

bool dc_remove_plane_from_context(
		const struct dc *dc,
		struct dc_stream_state *stream,
		struct dc_plane_state *plane_state,
		struct dc_state *context);

bool dc_rem_all_planes_for_stream(
		const struct dc *dc,
		struct dc_stream_state *stream,
		struct dc_state *context);

bool dc_add_all_planes_for_stream(
		const struct dc *dc,
		struct dc_stream_state *stream,
		struct dc_plane_state * const *plane_states,
		int plane_count,
		struct dc_state *context);

/*
 * Structure to store surface/stream associations for validation
 */
struct dc_validation_set {
	struct dc_stream_state *stream;
	struct dc_plane_state *plane_states[MAX_SURFACES];
	uint8_t plane_count;
};

bool dc_validate_stream(struct dc *dc, struct dc_stream_state *stream);

bool dc_validate_plane(struct dc *dc, const struct dc_plane_state *plane_state);

enum dc_status dc_validate_global_state(
		struct dc *dc,
		struct dc_state *new_ctx);

/*
 * This function takes a stream and checks if it is guaranteed to be supported.
 * Guaranteed means that MAX_COFUNC similar streams are supported.
 *
 * After this call:
 *   No hardware is programmed for call.  Only validation is done.
 */


void dc_resource_state_construct(
		const struct dc *dc,
		struct dc_state *dst_ctx);

void dc_resource_state_copy_construct(
		const struct dc_state *src_ctx,
		struct dc_state *dst_ctx);

void dc_resource_state_copy_construct_current(
		const struct dc *dc,
		struct dc_state *dst_ctx);

void dc_resource_state_destruct(struct dc_state *context);

/*
 * TODO update to make it about validation sets
 * Set up streams and links associated to drive sinks
 * The streams parameter is an absolute set of all active streams.
 *
 * After this call:
 *   Phy, Encoder, Timing Generator are programmed and enabled.
 *   New streams are enabled with blank stream; no memory read.
 */
bool dc_commit_state(struct dc *dc, struct dc_state *context);

/*
 * Set up streams and links associated to drive sinks
 * The streams parameter is an absolute set of all active streams.
 *
 * After this call:
 *   Phy, Encoder, Timing Generator are programmed and enabled.
 *   New streams are enabled with blank stream; no memory read.
 */
/*
 * Enable stereo when commit_streams is not required,
 * for example, frame alternate.
 */
bool dc_enable_stereo(
	struct dc *dc,
	struct dc_state *context,
	struct dc_stream_state *streams[],
	uint8_t stream_count);

/**
 * Create a new default stream for the requested sink
 */
struct dc_stream_state *dc_create_stream_for_sink(struct dc_sink *dc_sink);

void dc_stream_retain(struct dc_stream_state *dc_stream);
void dc_stream_release(struct dc_stream_state *dc_stream);

struct dc_stream_status *dc_stream_get_status(
	struct dc_stream_state *dc_stream);

enum surface_update_type dc_check_update_surfaces_for_stream(
		struct dc *dc,
		struct dc_surface_update *updates,
		int surface_count,
		struct dc_stream_update *stream_update,
		const struct dc_stream_status *stream_status);


struct dc_state *dc_create_state(void);
void dc_retain_state(struct dc_state *context);
void dc_release_state(struct dc_state *context);

/*******************************************************************************
 * Link Interfaces
 ******************************************************************************/

struct dpcd_caps {
	union dpcd_rev dpcd_rev;
	union max_lane_count max_ln_count;
	union max_down_spread max_down_spread;

	/* dongle type (DP converter, CV smart dongle) */
	enum display_dongle_type dongle_type;
	/* Dongle's downstream count. */
	union sink_count sink_count;
	/* If dongle_type == DISPLAY_DONGLE_DP_HDMI_CONVERTER,
	indicates 'Frame Sequential-to-lllFrame Pack' conversion capability.*/
	struct dc_dongle_caps dongle_caps;

	uint32_t sink_dev_id;
	uint32_t branch_dev_id;
	int8_t branch_dev_name[6];
	int8_t branch_hw_revision;

	bool allow_invalid_MSA_timing_param;
	bool panel_mode_edp;
	bool dpcd_display_control_capable;
};

struct dc_link_status {
	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];
};

/*
 * 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  */
	/* 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;

	uint8_t ddc_hw_inst;

	uint8_t hpd_src;

	uint8_t link_enc_hw_inst;

	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 link_encoder *link_enc;
	struct graphics_object_id link_id;
	union ddi_channel_mapping ddi_channel_mapping;
	struct connector_device_tag_info device_tag;
	struct dpcd_caps dpcd_caps;
	unsigned short chip_caps;
	unsigned int dpcd_sink_count;
	enum edp_revision edp_revision;
	bool psr_enabled;

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

	struct dc_link_status link_status;

};

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

/*
 * 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];
}

/* Set backlight level of an embedded panel (eDP, LVDS). */
bool dc_link_set_backlight_level(const struct dc_link *dc_link, uint32_t level,
		uint32_t frame_ramp, const struct dc_stream_state *stream);

bool dc_link_set_psr_enable(const struct dc_link *dc_link, bool enable, bool wait);

bool dc_link_get_psr_state(const struct dc_link *dc_link, uint32_t *psr_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);

/* 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,
};

bool dc_link_detect(struct dc_link *dc_link, enum dc_detect_reason reason);

/* 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);

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);

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

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,
	const struct link_training_settings *p_link_settings,
	const unsigned char *p_custom_pattern,
	unsigned int cust_pattern_size);

/*******************************************************************************
 * Sink Interfaces - A sink corresponds to a display output device
 ******************************************************************************/

struct dc_container_id {
	// 128bit GUID in binary form
	unsigned char  guid[16];
	// 8 byte port ID -> ELD.PortID
	unsigned int   portId[2];
	// 128bit GUID in binary formufacturer name -> ELD.ManufacturerName
	unsigned short manufacturerName;
	// 2 byte product code -> ELD.ProductCode
	unsigned short productCode;
};



/*
 * The sink structure contains EDID and other display device properties
 */
struct dc_sink {
	enum signal_type sink_signal;
	struct dc_edid dc_edid; /* raw edid */
	struct dc_edid_caps edid_caps; /* parse display caps */
	struct dc_container_id *dc_container_id;
	uint32_t dongle_max_pix_clk;
	void *priv;
	struct stereo_3d_features features_3d[TIMING_3D_FORMAT_MAX];
	bool converter_disable_audio;

	/* private to DC core */
	struct dc_link *link;
	struct dc_context *ctx;

	/* private to dc_sink.c */
	struct kref refcount;
};

void dc_sink_retain(struct dc_sink *sink);
void dc_sink_release(struct dc_sink *sink);

struct dc_sink_init_data {
	enum signal_type sink_signal;
	struct dc_link *link;
	uint32_t dongle_max_pix_clk;
	bool converter_disable_audio;
};

struct dc_sink *dc_sink_create(const struct dc_sink_init_data *init_params);

/*******************************************************************************
 * Cursor interfaces - To manages the cursor within a stream
 ******************************************************************************/
/* TODO: Deprecated once we switch to dc_set_cursor_position */
bool dc_stream_set_cursor_attributes(
	const struct dc_stream_state *stream,
	const struct dc_cursor_attributes *attributes);

bool dc_stream_set_cursor_position(
	struct dc_stream_state *stream,
	const struct dc_cursor_position *position);

/* Newer interfaces  */
struct dc_cursor {
	struct dc_plane_address address;
	struct dc_cursor_attributes attributes;
};

/*******************************************************************************
 * Interrupt interfaces
 ******************************************************************************/
enum dc_irq_source dc_interrupt_to_irq_source(
		struct dc *dc,
		uint32_t src_id,
		uint32_t ext_id);
void dc_interrupt_set(struct dc *dc, enum dc_irq_source src, bool enable);
void dc_interrupt_ack(struct dc *dc, enum dc_irq_source src);
enum dc_irq_source dc_get_hpd_irq_source_at_index(
		struct dc *dc, uint32_t link_index);

/*******************************************************************************
 * Power Interfaces
 ******************************************************************************/

void dc_set_power_state(
		struct dc *dc,
		enum dc_acpi_cm_power_state power_state);
void dc_resume(struct dc *dc);

/*
 * DPCD access interfaces
 */

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


#endif /* DC_INTERFACE_H_ */