drm/amd/display: Add DSC support for Navi (v2)

Add support for DCN2 DSC (Display Stream Compression)

HW Blocks:

 +--------++------+       +----------+
 | HUBBUB || HUBP |  <--  | MMHUBBUB |
 +--------++------+       +----------+
        |                     ^
        v                     |
    +--------+            +--------+
    |  DPP   |            |  DWB   |
    +--------+            +--------+
        |
        v                      ^
    +--------+                 |
    |  MPC   |                 |
    +--------+                 |
        |                      |
        v                      |
    +-------+      +-------+   |
    |  OPP  | <--> |  DSC  |   |
    +-------+      +-------+   |
        |                      |
        v                      |
    +--------+                /
    |  OPTC  |  --------------
    +--------+
        |
        v
    +--------+       +--------+
    |  DIO   |       |  DCCG  |
    +--------+       +--------+

v2: rebase (Alex)
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/Kconfig

@@ -25,6 +25,16 @@ config DRM_AMD_DC_DCN2_0
 	    Choose this option if you want to have
 	    Navi support for display engine
 
+config DRM_AMD_DC_DSC_SUPPORT
+	bool "DSC support"
+	default n
+	depends on DRM_AMD_DC && X86
+	depends on DRM_AMD_DC_DCN1_0
+	depends on DRM_AMD_DC_DCN2_0
+	help
+	    Choose this option if you want to have
+	    Dynamic Stream Compression support
+
 config DEBUG_KERNEL_DC
 	bool "Enable kgdb break in DC"
 	depends on DRM_AMD_DC

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c

@@ -542,6 +542,16 @@ bool dm_helpers_submit_i2c(
 
 	return result;
 }
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+bool dm_helpers_dp_write_dsc_enable(
+		struct dc_context *ctx,
+		const struct dc_stream_state *stream,
+		bool enable
+)
+{
+	return false;
+}
+#endif
 
 bool dm_helpers_is_dp_sink_present(struct dc_link *link)
 {

drivers/gpu/drm/amd/display/dc/Makefile

@@ -30,6 +30,9 @@ DC_LIBS += dcn20
 endif
 
 
+ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+DC_LIBS += dsc
+endif
 
 ifdef CONFIG_DRM_AMD_DC_DCN1_0
 DC_LIBS += dcn10 dml

drivers/gpu/drm/amd/display/dc/core/dc.c

@@ -56,6 +56,10 @@
 
 #include "dc_link_dp.h"
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dsc.h"
+#endif
+
 #ifdef CONFIG_DRM_AMD_DC_DCN2_0
 #include "vm_helper.h"
 #endif
@@ -1730,6 +1734,23 @@ static void commit_planes_do_stream_update(struct dc *dc,
 #endif
 			}
 
+#if defined(CONFIG_DRM_AMD_DC_DSC_SUPPORT)
+			if (stream_update->dsc_config && dc->hwss.pipe_control_lock_global) {
+				if (stream_update->dsc_config->num_slices_h &&
+						stream_update->dsc_config->num_slices_v) {
+					/* dsc enable */
+					dc->hwss.pipe_control_lock_global(dc, pipe_ctx, true);
+					dp_set_dsc_enable(pipe_ctx, true);
+					dc->hwss.pipe_control_lock_global(dc, pipe_ctx, false);
+				} else {
+					/* dsc disable */
+					dc->hwss.pipe_control_lock_global(dc, pipe_ctx, true);
+					dp_set_dsc_enable(pipe_ctx, false);
+					dc->hwss.pipe_control_lock_global(dc, pipe_ctx, false);
+				}
+
+			}
+#endif
 			/* Full fe update*/
 			if (update_type == UPDATE_TYPE_FAST)
 				continue;

drivers/gpu/drm/amd/display/dc/core/dc_link.c

@@ -1508,6 +1508,9 @@ static enum dc_status enable_link_dp(
 	if (link_settings.link_rate == LINK_RATE_LOW)
 			skip_video_pattern = false;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	dp_set_fec_ready(link, true);
+#endif
 
 	if (perform_link_training_with_retries(
 			link,
@@ -1520,6 +1523,9 @@ static enum dc_status enable_link_dp(
 	else
 		status = DC_FAIL_DP_LINK_TRAINING;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	dp_set_fec_enable(link, true);
+#endif
 	return status;
 }
 
@@ -2142,6 +2148,14 @@ static void disable_link(struct dc_link *link, enum signal_type signal)
 			dp_disable_link_phy(link, signal);
 		else
 			dp_disable_link_phy_mst(link, signal);
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+
+		if (dc_is_dp_sst_signal(signal) ||
+				link->mst_stream_alloc_table.stream_count == 0) {
+			dp_set_fec_enable(link, false);
+			dp_set_fec_ready(link, false);
+		}
+#endif
 	} else
 		link->link_enc->funcs->disable_output(link->link_enc, signal);
 
@@ -2376,6 +2390,11 @@ static struct fixed31_32 get_pbn_per_slot(struct dc_stream_state *stream)
 			&stream->link->cur_link_settings);
 	link_rate_in_mbytes_per_sec /= 8000; /* Kbits to MBytes */
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	if (stream->link->fec_state != dc_link_fec_not_ready)
+		link_rate_in_mbytes_per_sec = (link_rate_in_mbytes_per_sec * 970)/1000;
+#endif
+
 	mbytes_per_sec = dc_fixpt_from_int(link_rate_in_mbytes_per_sec);
 
 	return dc_fixpt_div_int(mbytes_per_sec, 54);
@@ -2738,12 +2757,30 @@ void core_link_enable_stream(
 		if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
 			allocate_mst_payload(pipe_ctx);
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		if (pipe_ctx->stream->timing.flags.DSC &&
+				(dc_is_dp_signal(pipe_ctx->stream->signal) ||
+				dc_is_virtual_signal(pipe_ctx->stream->signal))) {
+			dp_set_dsc_enable(pipe_ctx, true);
+			pipe_ctx->stream_res.tg->funcs->wait_for_state(
+					pipe_ctx->stream_res.tg,
+					CRTC_STATE_VBLANK);
+		}
+#endif
 		core_dc->hwss.unblank_stream(pipe_ctx,
 			&pipe_ctx->stream->link->cur_link_settings);
 
 		if (dc_is_dp_signal(pipe_ctx->stream->signal))
 			enable_stream_features(pipe_ctx);
 	}
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	else { // if (IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment))
+		if (dc_is_dp_signal(pipe_ctx->stream->signal) ||
+				dc_is_virtual_signal(pipe_ctx->stream->signal))
+			dp_set_dsc_enable(pipe_ctx, true);
+
+	}
+#endif
 }
 
 void core_link_disable_stream(struct pipe_ctx *pipe_ctx, int option)
@@ -2784,6 +2821,12 @@ void core_link_disable_stream(struct pipe_ctx *pipe_ctx, int option)
 	core_dc->hwss.disable_stream(pipe_ctx, option);
 
 	disable_link(pipe_ctx->stream->link, pipe_ctx->stream->signal);
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	if (pipe_ctx->stream->timing.flags.DSC &&
+			dc_is_dp_signal(pipe_ctx->stream->signal)) {
+		dp_set_dsc_enable(pipe_ctx, false);
+	}
+#endif
 }
 
 void core_link_set_avmute(struct pipe_ctx *pipe_ctx, bool enable)
@@ -2851,6 +2894,14 @@ uint32_t dc_bandwidth_in_kbps_from_timing(
 	uint32_t bits_per_channel = 0;
 	uint32_t kbps;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	if (timing->flags.DSC) {
+		kbps = (timing->pix_clk_100hz * timing->dsc_cfg.bits_per_pixel);
+		kbps = kbps / 160 + ((kbps % 160) ? 1 : 0);
+		return kbps;
+	}
+#endif
+
 	switch (timing->display_color_depth) {
 	case COLOR_DEPTH_666:
 		bits_per_channel = 6;

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

@@ -4,6 +4,9 @@
 #include "dc_link_dp.h"
 #include "dm_helpers.h"
 #include "opp.h"
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dsc.h"
+#endif
 #if defined(CONFIG_DRM_AMD_DC_DCN2_0)
 #include "resource.h"
 #endif
@@ -2379,6 +2382,10 @@ static bool retrieve_link_cap(struct dc_link *link)
 	uint32_t read_dpcd_retry_cnt = 3;
 	int i;
 	struct dp_sink_hw_fw_revision dp_hw_fw_revision;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	uint8_t dsc_data[16];
+	struct dsc_dec_dpcd_caps *dsc_caps;
+#endif
 
 	memset(dpcd_data, '\0', sizeof(dpcd_data));
 	memset(&down_strm_port_count,
@@ -2550,6 +2557,90 @@ static bool retrieve_link_cap(struct dc_link *link)
 		dp_hw_fw_revision.ieee_fw_rev,
 		sizeof(dp_hw_fw_revision.ieee_fw_rev));
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	dsc_caps = &link->dpcd_caps.dsc_sink_caps;
+	memset(dsc_caps, '\0', sizeof(*dsc_caps));
+	memset(&link->dpcd_caps.dsc_sink_caps, '\0',
+			sizeof(link->dpcd_caps.dsc_sink_caps));
+	memset(&link->dpcd_caps.fec_cap, '\0', sizeof(link->dpcd_caps.fec_cap));
+	/* Read DSC and FEC sink capabilities if DP revision is 1.4 and up */
+	if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_14) {
+		status = core_link_read_dpcd(
+				link,
+				DP_DSC_SUPPORT,
+				dsc_data,
+				sizeof(dsc_data));
+		if (status == DC_OK) {
+			DC_LOG_DSC("DSC capability read at link %d:",
+					link->link_index);
+			DC_LOG_DSC("\t%02x %02x %02x %02x",
+					dsc_data[0], dsc_data[1],
+					dsc_data[2], dsc_data[3]);
+			DC_LOG_DSC("\t%02x %02x %02x %02x",
+					dsc_data[4], dsc_data[5],
+					dsc_data[6], dsc_data[7]);
+			DC_LOG_DSC("\t%02x %02x %02x %02x",
+					dsc_data[8], dsc_data[9],
+					dsc_data[10], dsc_data[11]);
+			DC_LOG_DSC("\t%02x %02x %02x %02x",
+					dsc_data[12], dsc_data[13],
+					dsc_data[14], dsc_data[15]);
+		} else {
+			dm_error("%s: Read DSC dpcd data failed.\n", __func__);
+			return false;
+		}
+
+		if (dc_dsc_parse_dsc_dpcd(dsc_data,
+				dsc_caps)) {
+			DC_LOG_DSC("DSC capability parsed at link %d:",
+					link->link_index);
+			DC_LOG_DSC("\tis_dsc_supported:\t%d",
+					dsc_caps->is_dsc_supported);
+			DC_LOG_DSC("\tdsc_version:\t%d", dsc_caps->dsc_version);
+			DC_LOG_DSC("\trc_buffer_size:\t%d",
+					dsc_caps->rc_buffer_size);
+			DC_LOG_DSC("\tslice_caps1:\t0x%x20",
+					dsc_caps->slice_caps1.raw);
+			DC_LOG_DSC("\tslice_caps2:\t0x%x20",
+					dsc_caps->slice_caps2.raw);
+			DC_LOG_DSC("\tlb_bit_depth:\t%d",
+					dsc_caps->lb_bit_depth);
+			DC_LOG_DSC("\tis_block_pred_supported:\t%d",
+					dsc_caps->is_block_pred_supported);
+			DC_LOG_DSC("\tedp_max_bits_per_pixel:\t%d",
+					dsc_caps->edp_max_bits_per_pixel);
+			DC_LOG_DSC("\tcolor_formats:\t%d",
+					dsc_caps->color_formats.raw);
+			DC_LOG_DSC("\tcolor_depth:\t%d",
+					dsc_caps->color_depth.raw);
+			DC_LOG_DSC("\tthroughput_mode_0_mps:\t%d",
+					dsc_caps->throughput_mode_0_mps);
+			DC_LOG_DSC("\tthroughput_mode_1_mps:\t%d",
+					dsc_caps->throughput_mode_1_mps);
+			DC_LOG_DSC("\tmax_slice_width:\t%d",
+					dsc_caps->max_slice_width);
+			DC_LOG_DSC("\tbpp_increment_div:\t%d",
+					dsc_caps->bpp_increment_div);
+		} else {
+			/* Some sinks return bogus DSC DPCD data
+			 * when they don't support DSC.
+			 */
+			dm_error("%s: DSC DPCD data doesn't make sense. "
+					"DSC will be disabled.\n", __func__);
+			memset(&link->dpcd_caps.dsc_sink_caps, '\0',
+					sizeof(link->dpcd_caps.dsc_sink_caps));
+		}
+
+		status = core_link_read_dpcd(
+				link,
+				DP_FEC_CAPABILITY,
+				&link->dpcd_caps.fec_cap.raw,
+				sizeof(link->dpcd_caps.fec_cap.raw));
+		if (status != DC_OK)
+			dm_error("%s: Read FEC dpcd register failed.\n",
+					__func__);
+	}
+#endif
 
 	/* Connectivity log: detection */
 	CONN_DATA_DETECT(link, dpcd_data, sizeof(dpcd_data), "Rx Caps: ");
@@ -2964,4 +3055,66 @@ void dp_enable_mst_on_sink(struct dc_link *link, bool enable)
 	core_link_write_dpcd(link, DP_MSTM_CTRL, &mstmCntl, 1);
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+void dp_set_fec_ready(struct dc_link *link, bool ready)
+{
+	/* FEC has to be "set ready" before the link training.
+	 * The policy is to always train with FEC
+	 * if the sink supports it and leave it enabled on link.
+	 * If FEC is not supported, disable it.
+	 */
+	struct link_encoder *link_enc = link->link_enc;
+	uint8_t fec_config = 0;
+
+	if (link->dc->debug.disable_fec ||
+			IS_FPGA_MAXIMUS_DC(link->ctx->dce_environment))
+		return;
+
+	if (link_enc->funcs->fec_set_ready &&
+			link->dpcd_caps.fec_cap.bits.FEC_CAPABLE) {
+		if (link->fec_state == dc_link_fec_not_ready && ready) {
+			fec_config = 1;
+			if (core_link_write_dpcd(link,
+					DP_FEC_CONFIGURATION,
+					&fec_config,
+					sizeof(fec_config)) == DC_OK) {
+				link_enc->funcs->fec_set_ready(link_enc, true);
+				link->fec_state = dc_link_fec_ready;
+			} else {
+				dm_error("dpcd write failed to set fec_ready");
+			}
+		} else if (link->fec_state == dc_link_fec_ready && !ready) {
+			fec_config = 0;
+			core_link_write_dpcd(link,
+					DP_FEC_CONFIGURATION,
+					&fec_config,
+					sizeof(fec_config));
+			link->link_enc->funcs->fec_set_ready(
+					link->link_enc, false);
+			link->fec_state = dc_link_fec_not_ready;
+		}
+	}
+}
+
+void dp_set_fec_enable(struct dc_link *link, bool enable)
+{
+	struct link_encoder *link_enc = link->link_enc;
+
+	if (link->dc->debug.disable_fec ||
+			IS_FPGA_MAXIMUS_DC(link->ctx->dce_environment))
+		return;
+
+	if (link_enc->funcs->fec_set_enable &&
+			link->dpcd_caps.fec_cap.bits.FEC_CAPABLE) {
+		if (link->fec_state == dc_link_fec_ready && enable) {
+			msleep(1);
+			link_enc->funcs->fec_set_enable(link_enc, true);
+			link->fec_state = dc_link_fec_enabled;
+		} else if (link->fec_state == dc_link_fec_enabled && !enable) {
+			link_enc->funcs->fec_set_enable(link_enc, false);
+			link->fec_state = dc_link_fec_ready;
+		}
+	}
+}
+#endif
 

drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c

@@ -12,6 +12,12 @@
 #include "dc_link_ddc.h"
 #include "dm_helpers.h"
 #include "dpcd_defs.h"
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dsc.h"
+#endif
+#if defined(CONFIG_DRM_AMD_DC_DCN2_0)
+#include "resource.h"
+#endif
 
 enum dc_status core_link_read_dpcd(
 	struct dc_link *link,
@@ -360,3 +366,142 @@ void dp_retrain_link_dp_test(struct dc_link *link,
 		}
 	}
 }
+
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#define DC_LOGGER \
+	dsc->ctx->logger
+static void dsc_optc_config_log(struct display_stream_compressor *dsc,
+		struct dsc_optc_config *config)
+{
+	DC_LOG_DSC("Setting optc DSC config at DSC inst %d", dsc->inst);
+	DC_LOG_DSC("\n\tbytes_per_pixel %d\n\tis_pixel_format_444 %d\n\tslice_width %d",
+			config->bytes_per_pixel,
+			config->is_pixel_format_444, config->slice_width);
+}
+
+static bool dp_set_dsc_on_rx(struct pipe_ctx *pipe_ctx, bool enable)
+{
+	struct dc *core_dc = pipe_ctx->stream->ctx->dc;
+	struct dc_stream_state *stream = pipe_ctx->stream;
+	bool result = false;
+
+	if (IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment))
+		result = true;
+	else
+		result = dm_helpers_dp_write_dsc_enable(core_dc->ctx, stream, enable);
+	return result;
+}
+
+/* This has to be done after DSC was enabled on RX first, i.e. after dp_enable_dsc_on_rx() had been called
+ */
+static void dp_set_dsc_on_stream(struct pipe_ctx *pipe_ctx, bool enable)
+{
+	struct display_stream_compressor *dsc = pipe_ctx->stream_res.dsc;
+	struct dc *core_dc = pipe_ctx->stream->ctx->dc;
+	struct dc_stream_state *stream = pipe_ctx->stream;
+	struct pipe_ctx *odm_pipe = dc_res_get_odm_bottom_pipe(pipe_ctx);
+
+	if (enable) {
+		/* TODO proper function */
+		struct dsc_config dsc_cfg;
+		struct dsc_optc_config dsc_optc_cfg;
+		enum optc_dsc_mode optc_dsc_mode;
+		uint8_t dsc_packed_pps[128];
+
+		/* Enable DSC hw block */
+		dsc_cfg.pic_width = stream->timing.h_addressable + stream->timing.h_border_left + stream->timing.h_border_right;
+		dsc_cfg.pic_height = stream->timing.v_addressable + stream->timing.v_border_top + stream->timing.v_border_bottom;
+		dsc_cfg.pixel_encoding = stream->timing.pixel_encoding;
+		dsc_cfg.color_depth = stream->timing.display_color_depth;
+		dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
+
+		dsc->funcs->dsc_set_config(dsc, &dsc_cfg, &dsc_optc_cfg, &dsc_packed_pps[0]);
+		if (odm_pipe) {
+			struct display_stream_compressor *bot_dsc = odm_pipe->stream_res.dsc;
+			uint8_t dsc_packed_pps_odm[128];
+
+			dsc_cfg.pic_width /= 2;
+			ASSERT(dsc_cfg.dc_dsc_cfg.num_slices_h % 2 == 0);
+			dsc_cfg.dc_dsc_cfg.num_slices_h /= 2;
+			dsc->funcs->dsc_set_config(dsc, &dsc_cfg, &dsc_optc_cfg, &dsc_packed_pps_odm[0]);
+			bot_dsc->funcs->dsc_set_config(bot_dsc, &dsc_cfg, &dsc_optc_cfg, &dsc_packed_pps_odm[0]);
+			bot_dsc->funcs->dsc_enable(bot_dsc, odm_pipe->stream_res.opp->inst);
+		}
+		dsc->funcs->dsc_enable(dsc, pipe_ctx->stream_res.opp->inst);
+
+		optc_dsc_mode = dsc_optc_cfg.is_pixel_format_444 ? OPTC_DSC_ENABLED_444 : OPTC_DSC_ENABLED_NATIVE_SUBSAMPLED;
+
+		dsc_optc_config_log(dsc, &dsc_optc_cfg);
+		/* Enable DSC in encoder */
+		if (!IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment) && pipe_ctx->stream_res.stream_enc->funcs->dp_set_dsc_config)
+			pipe_ctx->stream_res.stream_enc->funcs->dp_set_dsc_config(pipe_ctx->stream_res.stream_enc,
+									optc_dsc_mode,
+									dsc_optc_cfg.bytes_per_pixel,
+									dsc_optc_cfg.slice_width,
+									&dsc_packed_pps[0]);
+
+		/* Enable DSC in OPTC */
+		pipe_ctx->stream_res.tg->funcs->set_dsc_config(pipe_ctx->stream_res.tg,
+							optc_dsc_mode,
+							dsc_optc_cfg.bytes_per_pixel,
+							dsc_optc_cfg.slice_width);
+	} else {
+		/* disable DSC in OPTC */
+		pipe_ctx->stream_res.tg->funcs->set_dsc_config(
+				pipe_ctx->stream_res.tg,
+				OPTC_DSC_DISABLED, 0, 0);
+
+		/* disable DSC in stream encoder */
+		if (!IS_FPGA_MAXIMUS_DC(core_dc->ctx->dce_environment)) {
+			pipe_ctx->stream_res.stream_enc->funcs->dp_set_dsc_config(
+					pipe_ctx->stream_res.stream_enc,
+					OPTC_DSC_DISABLED, 0, 0, NULL);
+		}
+
+		/* disable DSC block */
+		pipe_ctx->stream_res.dsc->funcs->dsc_disable(pipe_ctx->stream_res.dsc);
+		if (odm_pipe)
+			odm_pipe->stream_res.dsc->funcs->dsc_disable(odm_pipe->stream_res.dsc);
+	}
+}
+
+bool dp_set_dsc_enable(struct pipe_ctx *pipe_ctx, bool enable)
+{
+	struct dc_stream_state *stream = pipe_ctx->stream;
+	struct display_stream_compressor *dsc = pipe_ctx->stream_res.dsc;
+	bool result = false;
+
+	if (!dsc)
+		goto out;
+
+	if (enable && stream->is_dsc_enabled) {
+		/* update dsc stream */
+		dp_set_dsc_on_stream(pipe_ctx, true);
+		stream->is_dsc_enabled = true;
+		result = true;
+	} else if (enable && !stream->is_dsc_enabled) {
+		/* enable dsc on non dsc stream */
+		if (dp_set_dsc_on_rx(pipe_ctx, true)) {
+			dp_set_dsc_on_stream(pipe_ctx, true);
+			stream->is_dsc_enabled = true;
+			result = true;
+		} else {
+			stream->is_dsc_enabled = false;
+			result = false;
+		}
+	} else if (!enable && stream->is_dsc_enabled) {
+		/* disable dsc on dsc stream */
+		dp_set_dsc_on_rx(pipe_ctx, false);
+		dp_set_dsc_on_stream(pipe_ctx, false);
+		stream->is_dsc_enabled = false;
+		result = true;
+	} else {
+		/* disable dsc on non dsc stream */
+		result = true;
+	}
+out:
+	return result;
+}
+
+#endif
+

drivers/gpu/drm/amd/display/dc/core/dc_stream.c

@@ -105,6 +105,16 @@ static void construct(struct dc_stream_state *stream,
 	/* EDID CAP translation for HDMI 2.0 */
 	stream->timing.flags.LTE_340MCSC_SCRAMBLE = dc_sink_data->edid_caps.lte_340mcsc_scramble;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	memset(&stream->timing.dsc_cfg, 0, sizeof(stream->timing.dsc_cfg));
+	stream->timing.dsc_cfg.num_slices_h = 0;
+	stream->timing.dsc_cfg.num_slices_v = 0;
+	stream->timing.dsc_cfg.bits_per_pixel = 128;
+	stream->timing.dsc_cfg.block_pred_enable = 1;
+	stream->timing.dsc_cfg.linebuf_depth = 9;
+	stream->timing.dsc_cfg.version_minor = 2;
+	stream->timing.dsc_cfg.ycbcr422_simple = 0;
+#endif
 
 	update_stream_signal(stream, dc_sink_data);
 

drivers/gpu/drm/amd/display/dc/dc.h

@@ -331,6 +331,9 @@ struct dc_debug_options {
 	bool disable_dfs_bypass;
 	bool disable_dpp_power_gate;
 	bool disable_hubp_power_gate;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	bool disable_dsc_power_gate;
+#endif
 	bool disable_pplib_wm_range;
 	enum wm_report_mode pplib_wm_report_mode;
 	unsigned int min_disp_clk_khz;
@@ -363,6 +366,9 @@ struct dc_debug_options {
 	unsigned int force_fclk_khz;
 	bool disable_tri_buf;
 	struct dc_bw_validation_profile bw_val_profile;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	bool disable_fec;
+#endif
 };
 
 struct dc_debug_data {
@@ -894,6 +900,10 @@ struct dpcd_caps {
 	bool panel_mode_edp;
 	bool dpcd_display_control_capable;
 	bool ext_receiver_cap_field_present;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	union fec_capability fec_cap;
+	struct dsc_dec_dpcd_caps dsc_sink_caps;
+#endif
 };
 
 #include "dc_link.h"
@@ -928,6 +938,14 @@ struct dc_sink {
 	struct stereo_3d_features features_3d[TIMING_3D_FORMAT_MAX];
 	bool converter_disable_audio;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	struct dc_sink_dsc_caps {
+		// 'true' if these are virtual DPCD's DSC caps (immediately upstream of sink in MST topology),
+		// 'false' if they are sink's DSC caps
+		bool is_virtual_dpcd_dsc;
+		struct dsc_dec_dpcd_caps dsc_dec_caps;
+	} sink_dsc_caps;
+#endif
 
 	/* private to DC core */
 	struct dc_link *link;
@@ -986,4 +1004,10 @@ unsigned int dc_get_target_backlight_pwm(struct dc *dc);
 
 bool dc_is_dmcu_initialized(struct dc *dc);
 
+#if defined(CONFIG_DRM_AMD_DC_DSC_SUPPORT)
+/*******************************************************************************
+ * DSC Interfaces
+ ******************************************************************************/
+#include "dc_dsc.h"
+#endif
 #endif /* DC_INTERFACE_H_ */

drivers/gpu/drm/amd/display/dc/dc_dp_types.h

@@ -512,4 +512,18 @@ union test_misc {
 	unsigned char raw;
 };
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* FEC capability DPCD register field bits-*/
+union fec_capability {
+	struct {
+		uint8_t FEC_CAPABLE:1;
+		uint8_t UNCORRECTED_BLOCK_ERROR_COUNT_CAPABLE:1;
+		uint8_t CORRECTED_BLOCK_ERROR_COUNT_CAPABLE:1;
+		uint8_t BIT_ERROR_COUNT_CAPABLE:1;
+		uint8_t RESERVED:4;
+	} bits;
+	uint8_t raw;
+};
+#endif /* CONFIG_DRM_AMD_DC_DSC_SUPPORT */
+
 #endif /* DC_DP_TYPES_H */

drivers/gpu/drm/amd/display/dc/dc_dsc.h

+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#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
+ */
+struct dc_dsc_bw_range {
+	uint32_t min_kbps;
+	uint32_t min_target_bpp_x16;
+	uint32_t max_kbps;
+	uint32_t max_target_bpp_x16;
+	uint32_t stream_kbps;
+};
+
+
+bool dc_dsc_parse_dsc_dpcd(const uint8_t *dpcd_dsc_data,
+		struct dsc_dec_dpcd_caps *dsc_sink_caps);
+
+bool dc_dsc_compute_bandwidth_range(
+		const struct dc *dc,
+		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
+		const struct dc_crtc_timing *timing,
+		struct dc_dsc_bw_range *range);
+bool dc_dsc_compute_config(
+		const struct dc *dc,
+		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
+		int target_bandwidth,
+		const struct dc_crtc_timing *timing,
+		struct dc_dsc_config *dsc_cfg);
+
+bool dc_check_and_fit_timing_into_bandwidth_with_dsc_legacy(
+		const struct dc *pDC,
+		const struct dc_link *link,
+		struct dc_crtc_timing *timing);
+
+bool dc_setup_dsc_in_timing_legacy(const struct dc *pDC,
+		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
+		int available_bandwidth_kbps,
+		struct dc_crtc_timing *timing);
+#endif
+#endif

drivers/gpu/drm/amd/display/dc/dc_hw_types.h

@@ -709,6 +709,9 @@ struct dc_crtc_timing_flags {
 	 * rates less than or equal to 340Mcsc */
 	uint32_t LTE_340MCSC_SCRAMBLE:1;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	uint32_t DSC : 1; /* Use DSC with this timing */
+#endif
 };
 
 enum dc_timing_3d_format {
@@ -755,6 +758,18 @@ struct dc_crtc_timing_adjust {
 	uint32_t v_total_max;
 };
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+struct dc_dsc_config {
+	uint32_t num_slices_h; /* Number of DSC slices - horizontal */
+	uint32_t num_slices_v; /* Number of DSC slices - vertical */
+	uint32_t bits_per_pixel; /* DSC target bitrate in 1/16 of bpp (e.g. 128 -> 8bpp) */
+	bool block_pred_enable; /* DSC block prediction enable */
+	uint32_t linebuf_depth; /* DSC line buffer depth */
+	uint32_t version_minor; /* DSC minor version. Full version is formed as 1.version_minor. */
+	bool ycbcr422_simple; /* Tell DSC engine to convert YCbCr 4:2:2 to 'YCbCr 4:2:2 simple'. */
+	int32_t rc_buffer_size; /* DSC RC buffer block size in bytes */
+};
+#endif
 struct dc_crtc_timing {
 	uint32_t h_total;
 	uint32_t h_border_left;
@@ -781,6 +796,9 @@ struct dc_crtc_timing {
 	enum scanning_type scan_type;
 
 	struct dc_crtc_timing_flags flags;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	struct dc_dsc_config dsc_cfg;
+#endif
 };
 
 /* Passed on init */

drivers/gpu/drm/amd/display/dc/dc_link.h

@@ -29,6 +29,13 @@
 #include "dc_types.h"
 #include "grph_object_defs.h"
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+enum dc_link_fec_state {
+	dc_link_fec_not_ready,
+	dc_link_fec_ready,
+	dc_link_fec_enabled
+};
+#endif
 struct dc_link_status {
 	bool link_active;
 	struct dpcd_caps *dpcd_caps;
@@ -129,6 +136,9 @@ struct dc_link {
 
 	struct link_trace link_trace;
 	struct gpio *hpd_gpio;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	enum dc_link_fec_state fec_state;
+#endif
 };
 
 const struct dc_link_status *dc_link_get_status(const struct dc_link *dc_link);

drivers/gpu/drm/amd/display/dc/dc_stream.h

@@ -211,6 +211,9 @@ struct dc_stream_state {
 	bool apply_seamless_boot_optimization;
 
 	uint32_t stream_id;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	bool is_dsc_enabled;
+#endif
 };
 
 struct dc_stream_update {
@@ -238,6 +241,9 @@ struct dc_stream_update {
 #if defined(CONFIG_DRM_AMD_DC_DCN2_0)
 	struct dc_writeback_update *wb_update;
 #endif
+#if defined(CONFIG_DRM_AMD_DC_DSC_SUPPORT)
+	struct dc_dsc_config *dsc_config;
+#endif
 };
 
 bool dc_is_stream_unchanged(

drivers/gpu/drm/amd/display/dc/dc_types.h

@@ -553,6 +553,9 @@ enum dc_infoframe_type {
 	DC_HDMI_INFOFRAME_TYPE_AVI = 0x82,
 	DC_HDMI_INFOFRAME_TYPE_SPD = 0x83,
 	DC_HDMI_INFOFRAME_TYPE_AUDIO = 0x84,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	DC_DP_INFOFRAME_TYPE_PPS = 0x10,
+#endif
 };
 
 struct dc_info_packet {
@@ -706,4 +709,70 @@ struct AsicStateEx {
 	unsigned int phyClock;
 };
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* DSC DPCD capabilities */
+union dsc_slice_caps1 {
+	struct {
+		uint8_t NUM_SLICES_1 : 1;
+		uint8_t NUM_SLICES_2 : 1;
+		uint8_t RESERVED : 1;
+		uint8_t NUM_SLICES_4 : 1;
+		uint8_t NUM_SLICES_6 : 1;
+		uint8_t NUM_SLICES_8 : 1;
+		uint8_t NUM_SLICES_10 : 1;
+		uint8_t NUM_SLICES_12 : 1;
+	} bits;
+	uint8_t raw;
+};
+
+union dsc_slice_caps2 {
+	struct {
+		uint8_t NUM_SLICES_16 : 1;
+		uint8_t NUM_SLICES_20 : 1;
+		uint8_t NUM_SLICES_24 : 1;
+		uint8_t RESERVED : 5;
+	} bits;
+	uint8_t raw;
+};
+
+union dsc_color_formats {
+	struct {
+		uint8_t RGB : 1;
+		uint8_t YCBCR_444 : 1;
+		uint8_t YCBCR_SIMPLE_422 : 1;
+		uint8_t YCBCR_NATIVE_422 : 1;
+		uint8_t YCBCR_NATIVE_420 : 1;
+		uint8_t RESERVED : 3;
+	} bits;
+	uint8_t raw;
+};
+
+union dsc_color_depth {
+	struct {
+		uint8_t RESERVED1 : 1;
+		uint8_t COLOR_DEPTH_8_BPC : 1;
+		uint8_t COLOR_DEPTH_10_BPC : 1;
+		uint8_t COLOR_DEPTH_12_BPC : 1;
+		uint8_t RESERVED2 : 3;
+	} bits;
+	uint8_t raw;
+};
+
+struct dsc_dec_dpcd_caps {
+	bool is_dsc_supported;
+	uint8_t dsc_version;
+	int32_t rc_buffer_size; /* DSC RC buffer block size in bytes */
+	union dsc_slice_caps1 slice_caps1;
+	union dsc_slice_caps2 slice_caps2;
+	int32_t lb_bit_depth;
+	bool is_block_pred_supported;
+	int32_t edp_max_bits_per_pixel; /* Valid only in eDP */
+	union dsc_color_formats color_formats;
+	union dsc_color_depth color_depth;
+	int32_t throughput_mode_0_mps; /* In MPs */
+	int32_t throughput_mode_1_mps; /* In MPs */
+	int32_t max_slice_width;
+	uint32_t bpp_increment_div; /* bpp increment divisor, e.g. if 16, it's 1/16th of a bit */
+};
+#endif
 #endif /* DC_TYPES_H_ */

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

@@ -49,6 +49,9 @@
 #include "clk_mgr.h"
 
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dsc.h"
+#endif
 
 #define DC_LOGGER_INIT(logger)
 
@@ -347,6 +350,61 @@ void dcn10_log_hw_state(struct dc *dc,
 	}
 	DTN_INFO("\n");
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	DTN_INFO("DSC: CLOCK_EN  SLICE_WIDTH  Bytes_pp\n");
+	for (i = 0; i < pool->res_cap->num_dsc; i++) {
+		struct display_stream_compressor *dsc = pool->dscs[i];
+		struct dcn_dsc_state s = {0};
+
+		dsc->funcs->dsc_read_state(dsc, &s);
+		DTN_INFO("[%d]: %-9d %-12d %-10d\n",
+		dsc->inst,
+			s.dsc_clock_en,
+			s.dsc_slice_width,
+			s.dsc_bytes_per_pixel);
+		DTN_INFO("\n");
+	}
+	DTN_INFO("\n");
+
+	DTN_INFO("S_ENC: DSC_MODE  SEC_GSP7_LINE_NUM"
+			"  VBID6_LINE_REFERENCE  VBID6_LINE_NUM  SEC_GSP7_ENABLE  SEC_STREAM_ENABLE\n");
+	for (i = 0; i < pool->stream_enc_count; i++) {
+		struct stream_encoder *enc = pool->stream_enc[i];
+		struct enc_state s = {0};
+
+		if (enc->funcs->enc_read_state) {
+			enc->funcs->enc_read_state(enc, &s);
+			DTN_INFO("[%-3d]: %-9d %-18d %-21d %-15d %-16d %-17d\n",
+				enc->id,
+				s.dsc_mode,
+				s.sec_gsp7_line_num,
+				s.vbid6_line_reference,
+				s.vbid6_line_num,
+				s.sec_gsp7_enable,
+				s.sec_stream_enable);
+			DTN_INFO("\n");
+		}
+	}
+	DTN_INFO("\n");
+
+	DTN_INFO("L_ENC: DPHY_FEC_EN  DPHY_FEC_READY_SHADOW  DPHY_FEC_ACTIVE_STATUS\n");
+	for (i = 0; i < dc->link_count; i++) {
+		struct link_encoder *lenc = dc->links[i]->link_enc;
+
+		struct link_enc_state s = {0};
+
+		if (lenc->funcs->read_state) {
+			lenc->funcs->read_state(lenc, &s);
+			DTN_INFO("[%-3d]: %-12d %-22d %-22d\n",
+				i,
+				s.dphy_fec_en,
+				s.dphy_fec_ready_shadow,
+				s.dphy_fec_active_status);
+			DTN_INFO("\n");
+		}
+	}
+	DTN_INFO("\n");
+#endif
 
 	DTN_INFO("\nCALCULATED Clocks: dcfclk_khz:%d  dcfclk_deep_sleep_khz:%d  dispclk_khz:%d\n"
 		"dppclk_khz:%d  max_supported_dppclk_khz:%d  fclk_khz:%d  socclk_khz:%d\n\n",

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_optc.c

@@ -1507,10 +1507,28 @@ void dcn10_timing_generator_init(struct optc *optc1)
 	optc1->comb_opp_id = 0xf;
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* "Containter" vs. "pixel" is a concept within HW blocks, mostly those closer to the back-end. It works like this:
+ *
+ * - In most of the formats (RGB or YCbCr 4:4:4, 4:2:2 uncompressed and DSC 4:2:2 Simple) pixel rate is the same as
+ *   containter rate.
+ *
+ * - In 4:2:0 (DSC or uncompressed) there are two pixels per container, hence the target container rate has to be
+ *   halved to maintain the correct pixel rate.
+ *
+ * - Unlike 4:2:2 uncompressed, DSC 4:2:2 Native also has two pixels per container (this happens when DSC is applied
+ *   to it) and has to be treated the same as 4:2:0, i.e. target containter rate has to be halved in this case as well.
+ *
+ */
+#endif
 bool optc1_is_two_pixels_per_containter(const struct dc_crtc_timing *timing)
 {
 	bool two_pix = timing->pixel_encoding == PIXEL_ENCODING_YCBCR420;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	two_pix = two_pix || (timing->flags.DSC && timing->pixel_encoding == PIXEL_ENCODING_YCBCR422
+			&& !timing->dsc_cfg.ycbcr422_simple);
+#endif
 	return two_pix;
 }
 

drivers/gpu/drm/amd/display/dc/dcn20/Makefile

@@ -6,6 +6,10 @@ DCN20 = dcn20_resource.o dcn20_hwseq.o dcn20_dpp.o dcn20_dpp_cm.o dcn20_hubp.o \
 		dcn20_stream_encoder.o dcn20_link_encoder.o dcn20_dccg.o \
 		dcn20_vmid.o dcn20_dwb.o dcn20_dwb_scl.o
 
+ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+DCN20 += dcn20_dsc.o
+endif
+
 
 CFLAGS_dcn20_resource.o := -mhard-float -msse -mpreferred-stack-boundary=4
 

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c

@@ -32,6 +32,9 @@
 #include "dcn10/dcn10_hw_sequencer.h"
 #include "dcn20_hwseq.h"
 #include "dce/dce_hwseq.h"
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dcn20/dcn20_dsc.h"
+#endif
 #include "abm.h"
 #include "clk_mgr.h"
 #include "dmcu.h"
@@ -211,6 +214,76 @@ static void dcn20_init_blank(
 	dcn20_hwss_wait_for_blank_complete(opp);
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+static void dcn20_dsc_pg_control(
+		struct dce_hwseq *hws,
+		unsigned int dsc_inst,
+		bool power_on)
+{
+	uint32_t power_gate = power_on ? 0 : 1;
+	uint32_t pwr_status = power_on ? 0 : 2;
+
+	if (hws->ctx->dc->debug.disable_dsc_power_gate)
+		return;
+
+	if (REG(DOMAIN16_PG_CONFIG) == 0)
+		return;
+
+	switch (dsc_inst) {
+	case 0: /* DSC0 */
+		REG_UPDATE(DOMAIN16_PG_CONFIG,
+				DOMAIN16_POWER_GATE, power_gate);
+
+		REG_WAIT(DOMAIN16_PG_STATUS,
+				DOMAIN16_PGFSM_PWR_STATUS, pwr_status,
+				1, 1000);
+		break;
+	case 1: /* DSC1 */
+		REG_UPDATE(DOMAIN17_PG_CONFIG,
+				DOMAIN17_POWER_GATE, power_gate);
+
+		REG_WAIT(DOMAIN17_PG_STATUS,
+				DOMAIN17_PGFSM_PWR_STATUS, pwr_status,
+				1, 1000);
+		break;
+	case 2: /* DSC2 */
+		REG_UPDATE(DOMAIN18_PG_CONFIG,
+				DOMAIN18_POWER_GATE, power_gate);
+
+		REG_WAIT(DOMAIN18_PG_STATUS,
+				DOMAIN18_PGFSM_PWR_STATUS, pwr_status,
+				1, 1000);
+		break;
+	case 3: /* DSC3 */
+		REG_UPDATE(DOMAIN19_PG_CONFIG,
+				DOMAIN19_POWER_GATE, power_gate);
+
+		REG_WAIT(DOMAIN19_PG_STATUS,
+				DOMAIN19_PGFSM_PWR_STATUS, pwr_status,
+				1, 1000);
+		break;
+	case 4: /* DSC4 */
+		REG_UPDATE(DOMAIN20_PG_CONFIG,
+				DOMAIN20_POWER_GATE, power_gate);
+
+		REG_WAIT(DOMAIN20_PG_STATUS,
+				DOMAIN20_PGFSM_PWR_STATUS, pwr_status,
+				1, 1000);
+		break;
+	case 5: /* DSC5 */
+		REG_UPDATE(DOMAIN21_PG_CONFIG,
+				DOMAIN21_POWER_GATE, power_gate);
+
+		REG_WAIT(DOMAIN21_PG_STATUS,
+				DOMAIN21_PGFSM_PWR_STATUS, pwr_status,
+				1, 1000);
+		break;
+	default:
+		BREAK_TO_DEBUGGER();
+		break;
+	}
+}
+#endif
 
 static void dcn20_dpp_pg_control(
 		struct dce_hwseq *hws,
@@ -1457,10 +1530,30 @@ bool dcn20_dmdata_status_done(struct pipe_ctx *pipe_ctx)
 
 static void dcn20_disable_stream_gating(struct dc *dc, struct pipe_ctx *pipe_ctx)
 {
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	struct dce_hwseq *hws = dc->hwseq;
+	struct pipe_ctx *bot_odm_pipe = dc_res_get_odm_bottom_pipe(pipe_ctx);
+
+	if (pipe_ctx->stream_res.dsc) {
+		dcn20_dsc_pg_control(hws, pipe_ctx->stream_res.dsc->inst, true);
+		if (bot_odm_pipe)
+			dcn20_dsc_pg_control(hws, bot_odm_pipe->stream_res.dsc->inst, true);
+	}
+#endif
 }
 
 static void dcn20_enable_stream_gating(struct dc *dc, struct pipe_ctx *pipe_ctx)
 {
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	struct dce_hwseq *hws = dc->hwseq;
+	struct pipe_ctx *bot_odm_pipe = dc_res_get_odm_bottom_pipe(pipe_ctx);
+
+	if (pipe_ctx->stream_res.dsc) {
+		dcn20_dsc_pg_control(hws, pipe_ctx->stream_res.dsc->inst, false);
+		if (bot_odm_pipe)
+			dcn20_dsc_pg_control(hws, bot_odm_pipe->stream_res.dsc->inst, false);
+	}
+#endif
 }
 
 void dcn20_set_dmdata_attributes(struct pipe_ctx *pipe_ctx)

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.c

@@ -168,6 +168,10 @@ static struct mpll_cfg dcn2_mpll_cfg[] = {
 void enc2_fec_set_enable(struct link_encoder *enc, bool enable)
 {
 	struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	DC_LOG_DSC("%s FEC at link encoder inst %d",
+			enable ? "Enabling" : "Disabling", enc->id.enum_id);
+#endif
 	REG_UPDATE(DP_DPHY_CNTL, DPHY_FEC_EN, enable);
 }
 
@@ -188,6 +192,19 @@ bool enc2_fec_is_active(struct link_encoder *enc)
 	return (active != 0);
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* this function reads dsc related register fields to be logged later in dcn10_log_hw_state
+ * into a dcn_dsc_state struct.
+ */
+void link_enc2_read_state(struct link_encoder *enc, struct link_enc_state *s)
+{
+	struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);
+
+	REG_GET(DP_DPHY_CNTL, DPHY_FEC_EN, &s->dphy_fec_en);
+	REG_GET(DP_DPHY_CNTL, DPHY_FEC_READY_SHADOW, &s->dphy_fec_ready_shadow);
+	REG_GET(DP_DPHY_CNTL, DPHY_FEC_ACTIVE_STATUS, &s->dphy_fec_active_status);
+}
+#endif
 
 static bool update_cfg_data(
 		struct dcn10_link_encoder *enc10,
@@ -298,6 +315,9 @@ void enc2_hw_init(struct link_encoder *enc)
 }
 
 static const struct link_encoder_funcs dcn20_link_enc_funcs = {
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	.read_state = link_enc2_read_state,
+#endif
 	.validate_output_with_stream =
 		dcn10_link_encoder_validate_output_with_stream,
 	.hw_init = enc2_hw_init,

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_link_encoder.h

@@ -151,6 +151,9 @@ void enc2_fec_set_ready(struct link_encoder *enc, bool ready);
 bool enc2_fec_is_active(struct link_encoder *enc);
 void enc2_hw_init(struct link_encoder *enc);
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+void link_enc2_read_state(struct link_encoder *enc, struct link_enc_state *s);
+#endif
 
 void dcn20_link_encoder_construct(
 	struct dcn20_link_encoder *enc20,

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.c

@@ -167,6 +167,41 @@ void optc2_set_gsl_source_select(
 	}
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* DSC encoder frame start controls: x = h position, line_num = # of lines from vstartup */
+void optc2_set_dsc_encoder_frame_start(struct timing_generator *optc,
+					int x_position,
+					int line_num)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_SET_2(OTG_DSC_START_POSITION, 0,
+			OTG_DSC_START_POSITION_X, x_position,
+			OTG_DSC_START_POSITION_LINE_NUM, line_num);
+}
+
+/* Set DSC-related configuration.
+ *   dsc_mode: 0 disables DSC, other values enable DSC in specified format
+ *   sc_bytes_per_pixel: Bytes per pixel in u3.28 format
+ *   dsc_slice_width: Slice width in pixels
+ */
+void optc2_set_dsc_config(struct timing_generator *optc,
+					enum optc_dsc_mode dsc_mode,
+					uint32_t dsc_bytes_per_pixel,
+					uint32_t dsc_slice_width)
+{
+	struct optc *optc1 = DCN10TG_FROM_TG(optc);
+
+	REG_UPDATE(OPTC_DATA_FORMAT_CONTROL,
+		OPTC_DSC_MODE, dsc_mode);
+
+	REG_SET(OPTC_BYTES_PER_PIXEL, 0,
+		OPTC_DSC_BYTES_PER_PIXEL, dsc_bytes_per_pixel);
+
+	REG_UPDATE(OPTC_WIDTH_CONTROL,
+		OPTC_DSC_SLICE_WIDTH, dsc_slice_width);
+}
+#endif
 
 /**
  * PTI i think is already done somewhere else for 2ka
@@ -390,6 +425,9 @@ static struct timing_generator_funcs dcn20_tg_funcs = {
 		.setup_global_swap_lock = NULL,
 		.get_crc = optc1_get_crc,
 		.configure_crc = optc1_configure_crc,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		.set_dsc_config = optc2_set_dsc_config,
+#endif
 		.set_dwb_source = optc2_set_dwb_source,
 		.set_odm_bypass = optc2_set_odm_bypass,
 		.set_odm_combine = optc2_set_odm_combine,

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_optc.h

@@ -83,6 +83,12 @@ void optc2_set_gsl_source_select(struct timing_generator *optc,
 		int group_idx,
 		uint32_t gsl_ready_signal);
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+void optc2_set_dsc_config(struct timing_generator *optc,
+					enum optc_dsc_mode dsc_mode,
+					uint32_t dsc_bytes_per_pixel,
+					uint32_t dsc_slice_width);
+#endif
 
 void optc2_set_odm_bypass(struct timing_generator *optc,
 		const struct dc_crtc_timing *dc_crtc_timing);

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c

@@ -42,6 +42,10 @@
 #include "dce110/dce110_hw_sequencer.h"
 #include "dcn20_opp.h"
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dcn20_dsc.h"
+#endif
+
 #include "dcn20_link_encoder.h"
 #include "dcn20_stream_encoder.h"
 #include "dce/dce_clock_source.h"
@@ -83,7 +87,11 @@ struct _vcs_dpi_ip_params_st dcn2_0_ip = {
 	.hostvm_max_page_table_levels = 4,
 	.hostvm_cached_page_table_levels = 0,
 	.pte_group_size_bytes = 2048,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	.num_dsc = 6,
+#else
 	.num_dsc = 0,
+#endif
 	.rob_buffer_size_kbytes = 168,
 	.det_buffer_size_kbytes = 164,
 	.dpte_buffer_size_in_pte_reqs_luma = 84,
@@ -572,6 +580,29 @@ static const struct dcn20_vmid_mask vmid_masks = {
 		DCN20_VMID_MASK_SH_LIST(_MASK)
 };
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#define dsc_regsDCN20(id)\
+[id] = {\
+	DSC_REG_LIST_DCN20(id)\
+}
+
+static const struct dcn20_dsc_registers dsc_regs[] = {
+	dsc_regsDCN20(0),
+	dsc_regsDCN20(1),
+	dsc_regsDCN20(2),
+	dsc_regsDCN20(3),
+	dsc_regsDCN20(4),
+	dsc_regsDCN20(5)
+};
+
+static const struct dcn20_dsc_shift dsc_shift = {
+	DSC_REG_LIST_SH_MASK_DCN20(__SHIFT)
+};
+
+static const struct dcn20_dsc_mask dsc_mask = {
+	DSC_REG_LIST_SH_MASK_DCN20(_MASK)
+};
+#endif
 
 static const struct dccg_registers dccg_regs = {
 		DCCG_REG_LIST_DCN2()
@@ -595,6 +626,9 @@ static const struct resource_caps res_cap_nv10 = {
 		.num_dwb = 1,
 		.num_ddc = 6,
 		.num_vmid = 16,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		.num_dsc = 6,
+#endif
 };
 
 static const struct dc_plane_cap plane_cap = {
@@ -961,6 +995,30 @@ void dcn20_clock_source_destroy(struct clock_source **clk_src)
 	*clk_src = NULL;
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+
+struct display_stream_compressor *dcn20_dsc_create(
+	struct dc_context *ctx, uint32_t inst)
+{
+	struct dcn20_dsc *dsc =
+		kzalloc(sizeof(struct dcn20_dsc), GFP_KERNEL);
+
+	if (!dsc) {
+		BREAK_TO_DEBUGGER();
+		return NULL;
+	}
+
+	dsc2_construct(dsc, ctx, inst, &dsc_regs[inst], &dsc_shift, &dsc_mask);
+	return &dsc->base;
+}
+
+void dcn20_dsc_destroy(struct display_stream_compressor **dsc)
+{
+	kfree(container_of(*dsc, struct dcn20_dsc, base));
+	*dsc = NULL;
+}
+
+#endif
 
 static void destruct(struct dcn20_resource_pool *pool)
 {
@@ -973,6 +1031,12 @@ static void destruct(struct dcn20_resource_pool *pool)
 		}
 	}
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	for (i = 0; i < pool->base.res_cap->num_dsc; i++) {
+		if (pool->base.dscs[i] != NULL)
+			dcn20_dsc_destroy(&pool->base.dscs[i]);
+	}
+#endif
 
 	if (pool->base.mpc != NULL) {
 		kfree(TO_DCN20_MPC(pool->base.mpc));
@@ -1164,6 +1228,39 @@ enum dc_status dcn20_build_mapped_resource(const struct dc *dc, struct dc_state
 	return status;
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+
+static struct display_stream_compressor *acquire_dsc(struct resource_context *res_ctx,
+						const struct resource_pool *pool)
+{
+	int i;
+	struct display_stream_compressor *dsc = NULL;
+
+	/* Find first free DSC */
+	for (i = 0; i < pool->res_cap->num_dsc; i++)
+		if (!res_ctx->is_dsc_acquired[i]) {
+			dsc = pool->dscs[i];
+			res_ctx->is_dsc_acquired[i] = true;
+			break;
+		}
+
+	return dsc;
+}
+
+static void release_dsc(struct resource_context *res_ctx,
+			const struct resource_pool *pool,
+			const struct display_stream_compressor *dsc)
+{
+	int i;
+
+	for (i = 0; i < pool->res_cap->num_dsc; i++)
+		if (pool->dscs[i] == dsc) {
+			res_ctx->is_dsc_acquired[i] = false;
+			break;
+		}
+}
+
+#endif
 
 enum dc_status dcn20_add_stream_to_ctx(struct dc *dc, struct dc_state *new_ctx, struct dc_stream_state *dc_stream)
 {
@@ -1174,6 +1271,33 @@ enum dc_status dcn20_add_stream_to_ctx(struct dc *dc, struct dc_state *new_ctx,
 	if (result == DC_OK)
 		result = resource_map_phy_clock_resources(dc, new_ctx, dc_stream);
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	/* Get a DSC if required and available */
+	if (result == DC_OK) {
+		int i;
+		const struct resource_pool *pool = dc->res_pool;
+		bool is_add_dsc = true;
+
+		for (i = 0; i < dc->res_pool->pipe_count; i++) {
+			struct pipe_ctx *pipe_ctx = &new_ctx->res_ctx.pipe_ctx[i];
+
+			if (pipe_ctx->stream != dc_stream)
+				continue;
+
+			if (is_add_dsc) {
+				pipe_ctx->stream_res.dsc = acquire_dsc(&new_ctx->res_ctx, pool);
+
+				/* The number of DSCs can be less than the number of pipes */
+				if (!pipe_ctx->stream_res.dsc) {
+					dm_output_to_console("No DSCs available\n");
+					result = DC_NO_DSC_RESOURCE;
+				}
+			}
+
+			break;
+		}
+	}
+#endif
 
 	if (result == DC_OK)
 		result = dcn20_build_mapped_resource(dc, new_ctx, dc_stream);
@@ -1198,6 +1322,18 @@ enum dc_status dcn20_remove_stream_from_ctx(struct dc *dc, struct dc_state *new_
 	if (!pipe_ctx)
 		return DC_ERROR_UNEXPECTED;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	if (pipe_ctx->stream_res.dsc) {
+		struct pipe_ctx *odm_pipe = dc_res_get_odm_bottom_pipe(pipe_ctx);
+
+		release_dsc(&new_ctx->res_ctx, dc->res_pool, pipe_ctx->stream_res.dsc);
+		pipe_ctx->stream_res.dsc = NULL;
+		if (odm_pipe) {
+			release_dsc(&new_ctx->res_ctx, dc->res_pool, odm_pipe->stream_res.dsc);
+			odm_pipe->stream_res.dsc = NULL;
+		}
+	}
+#endif
 
 	return DC_OK;
 }
@@ -1331,6 +1467,14 @@ static bool dcn20_split_stream_for_combine(
 			sd->recout.x = 0;
 		}
 		secondary_pipe->stream_res.opp = pool->opps[secondary_pipe->pipe_idx];
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		if (is_add_dsc) {
+			secondary_pipe->stream_res.dsc = acquire_dsc(res_ctx, pool);
+			ASSERT(secondary_pipe->stream_res.dsc);
+			if (secondary_pipe->stream_res.dsc == NULL)
+				return false;
+		}
+#endif
 	} else {
 		ASSERT(primary_pipe->plane_state);
 		resource_build_scaling_params(primary_pipe);
@@ -1410,6 +1554,11 @@ int dcn20_populate_dml_pipes_from_context(
 		pipes[pipe_cnt].pipe.src.dcc = 0;
 		pipes[pipe_cnt].pipe.src.vm = 0;*/
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		pipes[pipe_cnt].dout.dsc_enable = res_ctx->pipe_ctx[i].stream->timing.flags.DSC;
+		/* todo: rotation?*/
+		pipes[pipe_cnt].dout.dsc_slices = res_ctx->pipe_ctx[i].stream->timing.dsc_cfg.num_slices_h;
+#endif
 		if (res_ctx->pipe_ctx[i].stream->use_dynamic_meta) {
 			pipes[pipe_cnt].pipe.src.dynamic_metadata_enable = true;
 			/* 1/2 vblank */
@@ -1751,6 +1900,10 @@ bool dcn20_validate_bandwidth(struct dc *dc,
 		hsplit_pipe->stream = NULL;
 		hsplit_pipe->top_pipe = NULL;
 		hsplit_pipe->bottom_pipe = NULL;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		if (hsplit_pipe->stream_res.dsc && hsplit_pipe->stream_res.dsc != pipe->stream_res.dsc)
+			release_dsc(&context->res_ctx, dc->res_pool, hsplit_pipe->stream_res.dsc);
+#endif
 		/* Clear plane_res and stream_res */
 		memset(&hsplit_pipe->plane_res, 0, sizeof(hsplit_pipe->plane_res));
 		memset(&hsplit_pipe->stream_res, 0, sizeof(hsplit_pipe->stream_res));
@@ -1997,6 +2150,10 @@ bool dcn20_validate_bandwidth(struct dc *dc,
 			context->bw_ctx.bw.dcn.clk.dppclk_khz = pipes[pipe_idx].clks_cfg.dppclk_mhz * 1000;
 		context->res_ctx.pipe_ctx[i].plane_res.bw.dppclk_khz =
 						pipes[pipe_idx].clks_cfg.dppclk_mhz * 1000;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+		context->res_ctx.pipe_ctx[i].plane_res.bw.dscclk_khz =
+				context->bw_ctx.dml.vba.DSCCLK_calculated[pipe_idx] * 1000;
+#endif
 		context->res_ctx.pipe_ctx[i].pipe_dlg_param = pipes[pipe_idx].pipe.dest;
 		pipe_idx++;
 	}
@@ -2045,6 +2202,23 @@ enum dc_status dcn20_validate_global(struct dc *dc,	struct dc_state *new_ctx)
 			if (pipe_ctx->stream != stream)
 				continue;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+			if (stream->timing.flags.DSC) {
+				if (pipe_ctx->stream_res.dsc != NULL) {
+					struct dsc_config dsc_cfg;
+
+					dsc_cfg.pic_width = stream->timing.h_addressable + stream->timing.h_border_left + stream->timing.h_border_right;
+					dsc_cfg.pic_height = stream->timing.v_addressable + stream->timing.v_border_top + stream->timing.v_border_bottom;
+					dsc_cfg.pixel_encoding = stream->timing.pixel_encoding;
+					dsc_cfg.color_depth = stream->timing.display_color_depth;
+					dsc_cfg.dc_dsc_cfg = stream->timing.dsc_cfg;
+
+					if (!pipe_ctx->stream_res.dsc->funcs->dsc_validate_stream(pipe_ctx->stream_res.dsc, &dsc_cfg))
+						result = DC_FAIL_DSC_VALIDATE;
+				} else
+					result = DC_FAIL_DSC_VALIDATE; // DSC enabled for this stream, but no free DSCs available
+			}
+#endif
 		}
 	}
 
@@ -2715,6 +2889,16 @@ static bool construct(
 		goto create_fail;
 	}
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	for (i = 0; i < pool->base.res_cap->num_dsc; i++) {
+		pool->base.dscs[i] = dcn20_dsc_create(ctx, i);
+		if (pool->base.dscs[i] == NULL) {
+			BREAK_TO_DEBUGGER();
+			dm_error("DC: failed to create display stream compressor %d!\n", i);
+			goto create_fail;
+		}
+	}
+#endif
 
 	if (!resource_construct(num_virtual_links, dc, &pool->base,
 			(!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment) ?

drivers/gpu/drm/amd/display/dc/dcn20/dcn20_stream_encoder.c

@@ -203,7 +203,165 @@ static void enc2_stream_encoder_stop_hdmi_info_packets(
 		HDMI_GENERIC7_LINE, 0);
 }
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+struct dc_info_packet_128 {
+	bool valid;
+	uint8_t hb0;
+	uint8_t hb1;
+	uint8_t hb2;
+	uint8_t hb3;
+	uint8_t sb[128];
+};
+
+/* Update GSP7 SDP 128 byte long */
+static void enc2_send_gsp7_128_info_packet(
+	struct dcn10_stream_encoder *enc1,
+	const struct dc_info_packet_128 *info_packet)
+{
+	uint32_t i;
+
+	/* TODOFPGA Figure out a proper number for max_retries polling for lock
+	 * use 50 for now.
+	 */
+	uint32_t max_retries = 50;
+	const uint32_t *content = (const uint32_t *) &info_packet->sb[0];
+
+	ASSERT(info_packet->hb1  == DC_DP_INFOFRAME_TYPE_PPS);
+
+	/* Configure for PPS packet size (128 bytes) */
+	REG_UPDATE(DP_SEC_CNTL2, DP_SEC_GSP7_PPS, 1);
+
+	/* We need turn on clock before programming AFMT block*/
+	REG_UPDATE(AFMT_CNTL, AFMT_AUDIO_CLOCK_EN, 1);
+
+	/* Poll dig_update_lock is not locked -> asic internal signal
+	 * assumes otg master lock will unlock it
+	 */
+	/*REG_WAIT(AFMT_VBI_PACKET_CONTROL, AFMT_GENERIC_LOCK_STATUS, 0, 10, max_retries);*/
 
+	/* Wait for HW/SW GSP memory access conflict to go away */
+	REG_WAIT(AFMT_VBI_PACKET_CONTROL, AFMT_GENERIC_CONFLICT,
+			0, 10, max_retries);
+
+	/* Clear HW/SW memory access conflict flag */
+	REG_UPDATE(AFMT_VBI_PACKET_CONTROL, AFMT_GENERIC_CONFLICT_CLR, 1);
+
+	/* write generic packet header */
+	REG_UPDATE(AFMT_VBI_PACKET_CONTROL, AFMT_GENERIC_INDEX, 7);
+	REG_SET_4(AFMT_GENERIC_HDR, 0,
+			AFMT_GENERIC_HB0, info_packet->hb0,
+			AFMT_GENERIC_HB1, info_packet->hb1,
+			AFMT_GENERIC_HB2, info_packet->hb2,
+			AFMT_GENERIC_HB3, info_packet->hb3);
+
+	/* Write generic packet content 128 bytes long. Four sets are used (indexes 7
+	 * through 10) to fit 128 bytes.
+	 */
+	for (i = 0; i < 4; i++) {
+		uint32_t packet_index = 7 + i;
+		REG_UPDATE(AFMT_VBI_PACKET_CONTROL, AFMT_GENERIC_INDEX, packet_index);
+
+		REG_WRITE(AFMT_GENERIC_0, *content++);
+		REG_WRITE(AFMT_GENERIC_1, *content++);
+		REG_WRITE(AFMT_GENERIC_2, *content++);
+		REG_WRITE(AFMT_GENERIC_3, *content++);
+		REG_WRITE(AFMT_GENERIC_4, *content++);
+		REG_WRITE(AFMT_GENERIC_5, *content++);
+		REG_WRITE(AFMT_GENERIC_6, *content++);
+		REG_WRITE(AFMT_GENERIC_7, *content++);
+	}
+
+	REG_UPDATE(AFMT_VBI_PACKET_CONTROL1, AFMT_GENERIC7_FRAME_UPDATE, 1);
+}
+
+/* Set DSC-related configuration.
+ *   dsc_mode: 0 disables DSC, other values enable DSC in specified format
+ *   sc_bytes_per_pixel: Bytes per pixel in u3.28 format
+ *   dsc_slice_width: Slice width in pixels
+ */
+static void enc2_dp_set_dsc_config(struct stream_encoder *enc,
+					enum optc_dsc_mode dsc_mode,
+					uint32_t dsc_bytes_per_pixel,
+					uint32_t dsc_slice_width,
+					uint8_t *dsc_packed_pps)
+{
+	struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
+
+	REG_UPDATE_2(DP_DSC_CNTL,
+			DP_DSC_MODE, dsc_mode,
+			DP_DSC_SLICE_WIDTH, dsc_slice_width);
+
+	REG_SET(DP_DSC_BYTES_PER_PIXEL, 0,
+		DP_DSC_BYTES_PER_PIXEL, dsc_bytes_per_pixel);
+
+	if (dsc_mode != OPTC_DSC_DISABLED) {
+		struct dc_info_packet_128 pps_sdp;
+
+		ASSERT(dsc_packed_pps);
+
+		/* Load PPS into infoframe (SDP) registers */
+		pps_sdp.valid = true;
+		pps_sdp.hb0 = 0;
+		pps_sdp.hb1 = DC_DP_INFOFRAME_TYPE_PPS;
+		pps_sdp.hb2 = 127;
+		pps_sdp.hb3 = 0;
+		memcpy(&pps_sdp.sb[0], dsc_packed_pps, sizeof(pps_sdp.sb));
+		enc2_send_gsp7_128_info_packet(enc1, &pps_sdp);
+
+		/* Enable Generic Stream Packet 7 (GSP) transmission */
+		//REG_UPDATE(DP_SEC_CNTL,
+		//	DP_SEC_GSP7_ENABLE, 1);
+
+		/* SW should make sure VBID[6] update line number is bigger
+		 * than PPS transmit line number
+		 */
+		REG_UPDATE(DP_SEC_CNTL6,
+				DP_SEC_GSP7_LINE_NUM, 2);
+		REG_UPDATE_2(DP_MSA_VBID_MISC,
+				DP_VBID6_LINE_REFERENCE, 0,
+				DP_VBID6_LINE_NUM, 3);
+
+		/* Send PPS data at the line number specified above.
+		 * DP spec requires PPS to be sent only when it changes, however since
+		 * decoder has to be able to handle its change on every frame, we're
+		 * sending it always (i.e. on every frame) to reduce the chance it'd be
+		 * missed by decoder. If it turns out required to send PPS only when it
+		 * changes, we can use DP_SEC_GSP7_SEND register.
+		 */
+		REG_UPDATE_2(DP_SEC_CNTL,
+			DP_SEC_GSP7_ENABLE, 1,
+			DP_SEC_STREAM_ENABLE, 1);
+	} else {
+		/* Disable Generic Stream Packet 7 (GSP) transmission */
+		REG_UPDATE(DP_SEC_CNTL, DP_SEC_GSP7_ENABLE, 0);
+		REG_UPDATE(DP_SEC_CNTL2, DP_SEC_GSP7_PPS, 0);
+	}
+}
+#endif
+
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+/* this function read dsc related register fields to be logged later in dcn10_log_hw_state
+ * into a dcn_dsc_state struct.
+ */
+static void enc2_read_state(struct stream_encoder *enc, struct enc_state *s)
+{
+	struct dcn10_stream_encoder *enc1 = DCN10STRENC_FROM_STRENC(enc);
+
+	//if dsc is enabled, continue to read
+	REG_GET(DP_DSC_CNTL, DP_DSC_MODE, &s->dsc_mode);
+	if (s->dsc_mode) {
+		REG_GET(DP_DSC_CNTL, DP_DSC_SLICE_WIDTH, &s->dsc_slice_width);
+		REG_GET(DP_SEC_CNTL6, DP_SEC_GSP7_LINE_NUM, &s->sec_gsp7_line_num);
+
+		REG_GET(DP_SEC_CNTL6, DP_SEC_GSP7_LINE_NUM, &s->sec_gsp7_line_num);
+		REG_GET(DP_MSA_VBID_MISC, DP_VBID6_LINE_REFERENCE, &s->vbid6_line_reference);
+		REG_GET(DP_MSA_VBID_MISC, DP_VBID6_LINE_NUM, &s->vbid6_line_num);
+
+		REG_GET(DP_SEC_CNTL, DP_SEC_GSP7_ENABLE, &s->sec_gsp7_enable);
+		REG_GET(DP_SEC_CNTL, DP_SEC_STREAM_ENABLE, &s->sec_stream_enable);
+	}
+}
+#endif
 
 /* Set Dynamic Metadata-configuration.
  *   enable_dme:         TRUE: enables Dynamic Metadata Enfine, FALSE: disables DME
@@ -283,6 +441,10 @@ static bool is_two_pixels_per_containter(const struct dc_crtc_timing *timing)
 {
 	bool two_pix = timing->pixel_encoding == PIXEL_ENCODING_YCBCR420;
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	two_pix = two_pix || (timing->flags.DSC && timing->pixel_encoding == PIXEL_ENCODING_YCBCR422
+			&& !timing->dsc_cfg.ycbcr422_simple);
+#endif
 	return two_pix;
 }
 
@@ -416,7 +578,13 @@ static const struct stream_encoder_funcs dcn20_str_enc_funcs = {
 	.setup_stereo_sync  = enc1_setup_stereo_sync,
 	.set_avmute = enc1_stream_encoder_set_avmute,
 	.dig_connect_to_otg  = enc1_dig_connect_to_otg,
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	.enc_read_state = enc2_read_state,
+#endif
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	.dp_set_dsc_config = enc2_dp_set_dsc_config,
+#endif
 	.set_dynamic_metadata = enc2_set_dynamic_metadata,
 };
 

drivers/gpu/drm/amd/display/dc/dm_helpers.h

@@ -118,6 +118,13 @@ bool dm_helpers_submit_i2c(
 		const struct dc_link *link,
 		struct i2c_command *cmd);
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+bool dm_helpers_dp_write_dsc_enable(
+		struct dc_context *ctx,
+		const struct dc_stream_state *stream,
+		bool enable
+);
+#endif
 bool dm_helpers_is_dp_sink_present(
 		struct dc_link *link);
 

drivers/gpu/drm/amd/display/dc/dsc/Makefile

+#
+# Makefile for the 'dsc' sub-component of DAL.
+
+CFLAGS_rc_calc.o := -mhard-float -msse -mpreferred-stack-boundary=4
+CFLAGS_rc_calc_dpi.o := -mhard-float -msse -mpreferred-stack-boundary=4
+CFLAGS_codec_main_amd.o := -mhard-float -msse -mpreferred-stack-boundary=4
+CFLAGS_dc_dsc.o := -mhard-float -msse -mpreferred-stack-boundary=4
+
+DSC = dc_dsc.o rc_calc.o rc_calc_dpi.o
+
+AMD_DAL_DSC = $(addprefix $(AMDDALPATH)/dc/dsc/,$(DSC))
+
+AMD_DISPLAY_FILES += $(AMD_DAL_DSC)

drivers/gpu/drm/amd/display/dc/dsc/dsc_helpers.c

+/*
+ * 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
+ *
+ */
+
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+
+#include "dc.h"
+#include "dsc.h"
+#include "dc_hw_types.h"
+#include <drm/drm_dp_helper.h>
+
+#define DC_LOGGER \
+	dsc->ctx->logger
+
+static bool dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size, int *buff_block_size);
+static bool dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth, int *line_buff_bit_depth);
+static bool dsc_throughput_from_dpcd(int dpcd_throughput, int *throughput);
+static bool dsc_bpp_increment_div_from_dpcd(int bpp_increment_dpcd, uint32_t *bpp_increment_div);
+
+void dsc_optc_config_log(struct display_stream_compressor *dsc,
+		struct dsc_optc_config *config)
+{
+	DC_LOG_DSC("Setting optc DSC config at DSC inst %d", dsc->inst);
+	DC_LOG_DSC("\n\tbytes_per_pixel %d\n\tis_pixel_format_444 %d\n\tslice_width %d",
+			config->bytes_per_pixel,
+			config->is_pixel_format_444, config->slice_width);
+}
+
+void dsc_config_log(struct display_stream_compressor *dsc,
+		const struct dsc_config *config)
+{
+	DC_LOG_DSC("Setting DSC Config at DSC inst %d", dsc->inst);
+	DC_LOG_DSC("\n\tnum_slices_h %d\n\tnum_slices_v %d\n\tbits_per_pixel %d\n\tcolor_depth %d",
+		config->dc_dsc_cfg.num_slices_h,
+		config->dc_dsc_cfg.num_slices_v,
+		config->dc_dsc_cfg.bits_per_pixel,
+		config->color_depth);
+}
+
+
+bool dsc_parse_dsc_dpcd(const uint8_t *dpcd_dsc_data, struct dsc_dec_dpcd_caps *dsc_sink_caps)
+{
+	dsc_sink_caps->is_dsc_supported = (dpcd_dsc_data[DP_DSC_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_DECOMPRESSION_IS_SUPPORTED) != 0;
+	if (!dsc_sink_caps->is_dsc_supported)
+		return true;
+
+	dsc_sink_caps->dsc_version = dpcd_dsc_data[DP_DSC_REV - DP_DSC_SUPPORT];
+
+	{
+		int buff_block_size;
+		int buff_size;
+
+		if (!dsc_buff_block_size_from_dpcd(dpcd_dsc_data[DP_DSC_RC_BUF_BLK_SIZE - DP_DSC_SUPPORT], &buff_block_size))
+			return false;
+
+		buff_size = dpcd_dsc_data[DP_DSC_RC_BUF_SIZE - DP_DSC_SUPPORT] + 1;
+		dsc_sink_caps->rc_buffer_size = buff_size * buff_block_size;
+	}
+
+	dsc_sink_caps->slice_caps1.raw = dpcd_dsc_data[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
+	if (!dsc_line_buff_depth_from_dpcd(dpcd_dsc_data[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT], &dsc_sink_caps->lb_bit_depth))
+		return false;
+
+	dsc_sink_caps->is_block_pred_supported =
+		(dpcd_dsc_data[DP_DSC_BLK_PREDICTION_SUPPORT - DP_DSC_SUPPORT] & DP_DSC_BLK_PREDICTION_IS_SUPPORTED) != 0;
+
+	dsc_sink_caps->edp_max_bits_per_pixel =
+		dpcd_dsc_data[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
+		dpcd_dsc_data[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] << 8;
+
+	dsc_sink_caps->color_formats.raw = dpcd_dsc_data[DP_DSC_DEC_COLOR_FORMAT_CAP - DP_DSC_SUPPORT];
+	dsc_sink_caps->color_depth.raw = dpcd_dsc_data[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
+
+	{
+		int dpcd_throughput = dpcd_dsc_data[DP_DSC_PEAK_THROUGHPUT - DP_DSC_SUPPORT];
+
+		if (!dsc_throughput_from_dpcd(dpcd_throughput & DP_DSC_THROUGHPUT_MODE_0_MASK, &dsc_sink_caps->throughput_mode_0_mps))
+			return false;
+
+		dpcd_throughput = (dpcd_throughput & DP_DSC_THROUGHPUT_MODE_1_MASK) >> DP_DSC_THROUGHPUT_MODE_1_SHIFT;
+		if (!dsc_throughput_from_dpcd(dpcd_throughput, &dsc_sink_caps->throughput_mode_1_mps))
+			return false;
+	}
+
+	dsc_sink_caps->max_slice_width = dpcd_dsc_data[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] * 320;
+	dsc_sink_caps->slice_caps2.raw = dpcd_dsc_data[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
+
+	if (!dsc_bpp_increment_div_from_dpcd(dpcd_dsc_data[DP_DSC_BITS_PER_PIXEL_INC - DP_DSC_SUPPORT], &dsc_sink_caps->bpp_increment_div))
+		return false;
+
+	return true;
+}
+
+
+/* This module's internal functions */
+
+static bool dsc_buff_block_size_from_dpcd(int dpcd_buff_block_size, int *buff_block_size)
+{
+
+	switch (dpcd_buff_block_size) {
+	case DP_DSC_RC_BUF_BLK_SIZE_1:
+		*buff_block_size = 1024;
+		break;
+	case DP_DSC_RC_BUF_BLK_SIZE_4:
+		*buff_block_size = 4 * 1024;
+		break;
+	case DP_DSC_RC_BUF_BLK_SIZE_16:
+		*buff_block_size = 16 * 1024;
+		break;
+	case DP_DSC_RC_BUF_BLK_SIZE_64:
+		*buff_block_size = 64 * 1024;
+		break;
+	default: {
+			dm_error("%s: DPCD DSC buffer size not recoginzed.\n", __func__);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+
+static bool dsc_line_buff_depth_from_dpcd(int dpcd_line_buff_bit_depth, int *line_buff_bit_depth)
+{
+	if (0 <= dpcd_line_buff_bit_depth && dpcd_line_buff_bit_depth <= 7)
+		*line_buff_bit_depth = dpcd_line_buff_bit_depth + 9;
+	else if (dpcd_line_buff_bit_depth == 8)
+		*line_buff_bit_depth = 8;
+	else {
+		dm_error("%s: DPCD DSC buffer depth not recoginzed.\n", __func__);
+		return false;
+	}
+
+	return true;
+}
+
+
+static bool dsc_throughput_from_dpcd(int dpcd_throughput, int *throughput)
+{
+	switch (dpcd_throughput) {
+	case DP_DSC_THROUGHPUT_MODE_0_340:
+		*throughput = 340;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_400:
+		*throughput = 400;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_450:
+		*throughput = 450;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_500:
+		*throughput = 500;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_550:
+		*throughput = 550;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_600:
+		*throughput = 600;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_650:
+		*throughput = 650;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_700:
+		*throughput = 700;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_750:
+		*throughput = 750;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_800:
+		*throughput = 800;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_850:
+		*throughput = 850;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_900:
+		*throughput = 900;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_950:
+		*throughput = 950;
+		break;
+	case DP_DSC_THROUGHPUT_MODE_0_1000:
+		*throughput = 1000;
+		break;
+	default: {
+			dm_error("%s: DPCD DSC througput mode not recoginzed.\n", __func__);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+
+static bool dsc_bpp_increment_div_from_dpcd(int bpp_increment_dpcd, uint32_t *bpp_increment_div)
+{
+
+	switch (bpp_increment_dpcd) {
+	case 0:
+		*bpp_increment_div = 16;
+		break;
+	case 1:
+		*bpp_increment_div = 8;
+		break;
+	case 2:
+		*bpp_increment_div = 4;
+		break;
+	case 3:
+		*bpp_increment_div = 2;
+		break;
+	case 4:
+		*bpp_increment_div = 1;
+		break;
+	default: {
+		dm_error("%s: DPCD DSC bits-per-pixel increment not recoginzed.\n", __func__);
+		return false;
+	}
+	}
+
+	return true;
+}
+
+
+#endif // CONFIG_DRM_AMD_DC_DSC_SUPPORT

drivers/gpu/drm/amd/display/dc/dsc/dscc_types.h

+#if defined(CONFIG_DRM_AMD_DC_DCN2_0)
+
+/*
+ * Copyright 2017 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 __DSCC_TYPES_H__
+#define __DSCC_TYPES_H__
+
+#include <drm/drm_dsc.h>
+
+#ifndef NUM_BUF_RANGES
+#define NUM_BUF_RANGES 15
+#endif
+
+struct dsc_pps_rc_range {
+	int range_min_qp;
+	int range_max_qp;
+	int range_bpg_offset;
+};
+
+struct dsc_parameters {
+	struct drm_dsc_config pps;
+
+	/* Additional parameters for register programming */
+	uint32_t bytes_per_pixel; /* In u3.28 format */
+	uint32_t rc_buffer_model_size;
+};
+
+int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_parameters *dsc_params);
+
+#endif
+
+#endif

drivers/gpu/drm/amd/display/dc/dsc/rc_calc.h

+#if defined(CONFIG_DRM_AMD_DC_DCN2_0)
+
+/*
+ * Copyright 2017 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 __RC_CALC_H__
+#define __RC_CALC_H__
+
+
+#define QP_SET_SIZE 15
+
+typedef int qp_set[QP_SET_SIZE];
+
+struct rc_params {
+	int      rc_quant_incr_limit0;
+	int      rc_quant_incr_limit1;
+	int      initial_fullness_offset;
+	int      initial_xmit_delay;
+	int      first_line_bpg_offset;
+	int      second_line_bpg_offset;
+	int      flatness_min_qp;
+	int      flatness_max_qp;
+	int      flatness_det_thresh;
+	qp_set   qp_min;
+	qp_set   qp_max;
+	qp_set   ofs;
+	int      rc_model_size;
+	int      rc_edge_factor;
+	int      rc_tgt_offset_hi;
+	int      rc_tgt_offset_lo;
+	int      rc_buf_thresh[QP_SET_SIZE - 1];
+};
+
+enum colour_mode {
+	CM_RGB,   /* 444 RGB */
+	CM_444,   /* 444 YUV or simple 422 */
+	CM_422,   /* native 422 */
+	CM_420    /* native 420 */
+};
+
+enum bits_per_comp {
+	BPC_8  =  8,
+	BPC_10 = 10,
+	BPC_12 = 12
+};
+
+enum max_min {
+	MM_MIN = 0,
+	MM_MAX = 1
+};
+
+struct qp_entry {
+	float         bpp;
+	const qp_set  qps;
+};
+
+typedef struct qp_entry qp_table[];
+
+void calc_rc_params(struct rc_params *rc, enum colour_mode cm, enum bits_per_comp bpc, float bpp, int slice_width, int slice_height, int minor_version);
+
+#endif
+
+#endif

drivers/gpu/drm/amd/display/dc/dsc/rc_calc_dpi.c

+#if defined(CONFIG_DRM_AMD_DC_DSC_SUPPORT)
+/*
+ * Copyright 2012-17 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 "os_types.h"
+#include <drm/drm_dsc.h>
+#include "dscc_types.h"
+#include "rc_calc.h"
+
+double dsc_ceil(double num);
+
+static void copy_pps_fields(struct drm_dsc_config *to, const struct drm_dsc_config *from)
+{
+	to->line_buf_depth           = from->line_buf_depth;
+	to->bits_per_component       = from->bits_per_component;
+	to->convert_rgb              = from->convert_rgb;
+	to->slice_width              = from->slice_width;
+	to->slice_height             = from->slice_height;
+	to->simple_422               = from->simple_422;
+	to->native_422               = from->native_422;
+	to->native_420               = from->native_420;
+	to->pic_width                = from->pic_width;
+	to->pic_height               = from->pic_height;
+	to->rc_tgt_offset_high       = from->rc_tgt_offset_high;
+	to->rc_tgt_offset_low        = from->rc_tgt_offset_low;
+	to->bits_per_pixel           = from->bits_per_pixel;
+	to->rc_edge_factor           = from->rc_edge_factor;
+	to->rc_quant_incr_limit1     = from->rc_quant_incr_limit1;
+	to->rc_quant_incr_limit0     = from->rc_quant_incr_limit0;
+	to->initial_xmit_delay       = from->initial_xmit_delay;
+	to->initial_dec_delay        = from->initial_dec_delay;
+	to->block_pred_enable        = from->block_pred_enable;
+	to->first_line_bpg_offset    = from->first_line_bpg_offset;
+	to->second_line_bpg_offset   = from->second_line_bpg_offset;
+	to->initial_offset           = from->initial_offset;
+	memcpy(&to->rc_buf_thresh, &from->rc_buf_thresh, sizeof(from->rc_buf_thresh));
+	memcpy(&to->rc_range_params, &from->rc_range_params, sizeof(from->rc_range_params));
+	to->rc_model_size            = from->rc_model_size;
+	to->flatness_min_qp          = from->flatness_min_qp;
+	to->flatness_max_qp          = from->flatness_max_qp;
+	to->initial_scale_value      = from->initial_scale_value;
+	to->scale_decrement_interval = from->scale_decrement_interval;
+	to->scale_increment_interval = from->scale_increment_interval;
+	to->nfl_bpg_offset           = from->nfl_bpg_offset;
+	to->nsl_bpg_offset           = from->nsl_bpg_offset;
+	to->slice_bpg_offset         = from->slice_bpg_offset;
+	to->final_offset             = from->final_offset;
+	to->vbr_enable               = from->vbr_enable;
+	to->slice_chunk_size         = from->slice_chunk_size;
+	to->second_line_offset_adj   = from->second_line_offset_adj;
+	to->dsc_version_minor        = from->dsc_version_minor;
+}
+
+static void copy_rc_to_cfg(struct drm_dsc_config *dsc_cfg, const struct rc_params *rc)
+{
+	int i;
+
+	dsc_cfg->rc_quant_incr_limit0   = rc->rc_quant_incr_limit0;
+	dsc_cfg->rc_quant_incr_limit1   = rc->rc_quant_incr_limit1;
+	dsc_cfg->initial_offset         = rc->initial_fullness_offset;
+	dsc_cfg->initial_xmit_delay     = rc->initial_xmit_delay;
+	dsc_cfg->first_line_bpg_offset  = rc->first_line_bpg_offset;
+	dsc_cfg->second_line_bpg_offset = rc->second_line_bpg_offset;
+	dsc_cfg->flatness_min_qp        = rc->flatness_min_qp;
+	dsc_cfg->flatness_max_qp        = rc->flatness_max_qp;
+	for (i = 0; i < QP_SET_SIZE; ++i) {
+		dsc_cfg->rc_range_params[i].range_min_qp     = rc->qp_min[i];
+		dsc_cfg->rc_range_params[i].range_max_qp     = rc->qp_max[i];
+		/* Truncate 8-bit signed value to 6-bit signed value */
+		dsc_cfg->rc_range_params[i].range_bpg_offset = 0x3f & rc->ofs[i];
+	}
+	dsc_cfg->rc_model_size    = rc->rc_model_size;
+	dsc_cfg->rc_edge_factor   = rc->rc_edge_factor;
+	dsc_cfg->rc_tgt_offset_high = rc->rc_tgt_offset_hi;
+	dsc_cfg->rc_tgt_offset_low = rc->rc_tgt_offset_lo;
+
+	for (i = 0; i < QP_SET_SIZE - 1; ++i)
+		dsc_cfg->rc_buf_thresh[i] = rc->rc_buf_thresh[i];
+}
+
+int dscc_compute_dsc_parameters(const struct drm_dsc_config *pps, struct dsc_parameters *dsc_params)
+{
+	enum colour_mode  mode = pps->convert_rgb ? CM_RGB :
+							(pps->simple_422  ? CM_444 :
+							(pps->native_422  ? CM_422 :
+							pps->native_420  ? CM_420 : CM_444));
+	enum bits_per_comp bpc = (pps->bits_per_component == 8) ? BPC_8 :
+							(pps->bits_per_component == 10) ? BPC_10 : BPC_12;
+	float            bpp = ((float) pps->bits_per_pixel / 16.0);
+	int              slice_width  = pps->slice_width;
+	int              slice_height = pps->slice_height;
+	int              ret;
+	struct rc_params rc;
+	struct drm_dsc_config   dsc_cfg;
+
+	double d_bytes_per_pixel = dsc_ceil(bpp * slice_width / 8.0) / slice_width;
+
+	// TODO: Make sure the formula for calculating this is precise (ceiling vs. floor, and at what point they should be applied)
+	if (pps->native_422 || pps->native_420)
+		d_bytes_per_pixel /= 2;
+
+	dsc_params->bytes_per_pixel = (uint32_t)dsc_ceil(d_bytes_per_pixel * 0x10000000);
+
+	/* in native_422 or native_420 modes, the bits_per_pixel is double the target bpp
+	 * (the latter is what calc_rc_params expects)
+	 */
+	if (pps->native_422 || pps->native_420)
+		bpp /= 2.0;
+
+	calc_rc_params(&rc, mode, bpc, bpp, slice_width, slice_height, pps->dsc_version_minor);
+	dsc_params->pps = *pps;
+	dsc_params->pps.initial_scale_value = 8 * rc.rc_model_size / (rc.rc_model_size - rc.initial_fullness_offset);
+
+	copy_pps_fields(&dsc_cfg, &dsc_params->pps);
+	copy_rc_to_cfg(&dsc_cfg, &rc);
+
+	dsc_cfg.mux_word_size = dsc_params->pps.bits_per_component <= 10 ? 48 : 64;
+
+	ret = drm_dsc_compute_rc_parameters(&dsc_cfg);
+
+	copy_pps_fields(&dsc_params->pps, &dsc_cfg);
+	dsc_params->rc_buffer_model_size = dsc_cfg.rc_bits;
+	return ret;
+}
+
+#endif

drivers/gpu/drm/amd/display/dc/inc/core_status.h

@@ -43,7 +43,12 @@ enum dc_status {
 	DC_FAIL_BANDWIDTH_VALIDATE = 13, /* BW and Watermark validation */
 	DC_FAIL_SCALING = 14,
 	DC_FAIL_DP_LINK_TRAINING = 15,
+#ifdef CONFIG_DRM_AMD_DC_DCN2_0
+	DC_FAIL_DSC_VALIDATE = 16,
+	DC_NO_DSC_RESOURCE = 17,
+#endif
 	DC_FAIL_UNSUPPORTED_1 = 18,
+
 	DC_ERROR_UNEXPECTED = -1
 };
 

drivers/gpu/drm/amd/display/dc/inc/core_types.h

@@ -179,6 +179,9 @@ struct resource_pool {
 	} gsl_groups;
 #endif
 
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	struct display_stream_compressor *dscs[MAX_PIPES];
+#endif
 
 	unsigned int pipe_count;
 	unsigned int underlay_pipe_index;
@@ -219,10 +222,16 @@ struct resource_pool {
 
 struct dcn_fe_bandwidth {
 	int dppclk_khz;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	int dscclk_khz;
+#endif
 };
 
 struct stream_resource {
 	struct output_pixel_processor *opp;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	struct display_stream_compressor *dsc;
+#endif
 	struct timing_generator *tg;
 	struct stream_encoder *stream_enc;
 	struct audio *audio;

drivers/gpu/drm/amd/display/dc/inc/resource.h

@@ -46,6 +46,9 @@ struct resource_caps {
 	int num_ddc;
 #ifdef CONFIG_DRM_AMD_DC_DCN2_0
 	int num_vmid;
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+	int num_dsc;
+#endif
 #endif
 };