xref: /openbmc/linux/drivers/gpu/drm/amd/display/dc/dc_dsc.h (revision 34d6f206a88c2651d216bd3487ac956a40b2ba8e)

#ifndef DC_DSC_H_
#define DC_DSC_H_
/*
 * Copyright 2019 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.
 *
 * Author: AMD
 */

/* put it here temporarily until linux has the new addresses official defined */
/* DP Extended DSC Capabilities */
#define DP_DSC_BRANCH_OVERALL_THROUGHPUT_0  0x0a0   /* DP 1.4a SCR */
#define DP_DSC_BRANCH_OVERALL_THROUGHPUT_1  0x0a1
#define DP_DSC_BRANCH_MAX_LINE_WIDTH        0x0a2
#include "dc_types.h"

struct dc_dsc_bw_range {
	uint32_t min_kbps; /* Bandwidth if min_target_bpp_x16 is used */
	uint32_t min_target_bpp_x16;
	uint32_t max_kbps; /* Bandwidth if max_target_bpp_x16 is used */
	uint32_t max_target_bpp_x16;
	uint32_t stream_kbps; /* Uncompressed stream bandwidth */
};

struct display_stream_compressor {
	const struct dsc_funcs *funcs;
	struct dc_context *ctx;
	int inst;
};

struct dc_dsc_policy {
	bool use_min_slices_h;
	int max_slices_h; // Maximum available if 0
	int min_slice_height; // Must not be less than 8
	uint32_t max_target_bpp;
	uint32_t min_target_bpp;
	bool enable_dsc_when_not_needed;
};

struct dc_dsc_config_options {
	uint32_t dsc_min_slice_height_override;
	uint32_t max_target_bpp_limit_override_x16;
	uint32_t slice_height_granularity;
	uint32_t dsc_force_odm_hslice_override;
};

bool dc_dsc_parse_dsc_dpcd(const struct dc *dc,
		const uint8_t *dpcd_dsc_basic_data,
		const uint8_t *dpcd_dsc_ext_data,
		struct dsc_dec_dpcd_caps *dsc_sink_caps);

bool dc_dsc_compute_bandwidth_range(
		const struct display_stream_compressor *dsc,
		uint32_t dsc_min_slice_height_override,
		uint32_t min_bpp_x16,
		uint32_t max_bpp_x16,
		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
		const struct dc_crtc_timing *timing,
		const enum dc_link_encoding_format link_encoding,
		struct dc_dsc_bw_range *range);

bool dc_dsc_compute_config(
		const struct display_stream_compressor *dsc,
		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
		const struct dc_dsc_config_options *options,
		uint32_t target_bandwidth_kbps,
		const struct dc_crtc_timing *timing,
		const enum dc_link_encoding_format link_encoding,
		struct dc_dsc_config *dsc_cfg);

uint32_t dc_dsc_stream_bandwidth_in_kbps(const struct dc_crtc_timing *timing,
		uint32_t bpp_x16, uint32_t num_slices_h, bool is_dp);

uint32_t dc_dsc_stream_bandwidth_overhead_in_kbps(
		const struct dc_crtc_timing *timing,
		const int num_slices_h,
		const bool is_dp);

/* TODO - Hardware/specs limitation should be owned by dc dsc and returned to DM,
 * and DM can choose to OVERRIDE the limitation on CASE BY CASE basis.
 * Hardware/specs limitation should not be writable by DM.
 * It should be decoupled from DM specific policy and named differently.
 */
void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing,
		uint32_t max_target_bpp_limit_override_x16,
		struct dc_dsc_policy *policy,
		const enum dc_link_encoding_format link_encoding);

void dc_dsc_policy_set_max_target_bpp_limit(uint32_t limit);

void dc_dsc_policy_set_enable_dsc_when_not_needed(bool enable);

void dc_dsc_policy_set_disable_dsc_stream_overhead(bool disable);

void dc_dsc_get_default_config_option(const struct dc *dc, struct dc_dsc_config_options *options);

#endif