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>

1 files changed, 899 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
new file mode 100644
index 000000000000..4ffcc2844d19
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -0,0 +1,899 @@
+/*
+ * 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
+ */
+
+#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
+#include "dc.h"
+#include "core_types.h"
+#include "dsc.h"
+#include <drm/drm_dp_helper.h>
+
+/* 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;
+}
+
+static void get_dsc_enc_caps(
+	const struct dc *dc,
+	struct dsc_enc_caps *dsc_enc_caps,
+	int pixel_clock_100Hz)
+{
+	// This is a static HW query, so we can use any DSC
+	struct display_stream_compressor *dsc = dc->res_pool->dscs[0];
+
+	memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps));
+	if (dsc)
+		dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz);
+}
+
+/* Returns 'false' if no intersection was found for at least one capablity.
+ * It also implicitly validates some sink caps against invalid value of zero.
+ */
+static bool dc_intersect_dsc_caps(
+	const struct dsc_dec_dpcd_caps *dsc_sink_caps,
+	const struct dsc_enc_caps *dsc_enc_caps,
+	enum dc_pixel_encoding pixel_encoding,
+	struct dsc_enc_caps *dsc_common_caps)
+{
+	int32_t max_slices;
+	int32_t total_sink_throughput;
+
+	memset(dsc_common_caps, 0, sizeof(struct dsc_enc_caps));
+
+	dsc_common_caps->dsc_version = min(dsc_sink_caps->dsc_version, dsc_enc_caps->dsc_version);
+	if (!dsc_common_caps->dsc_version)
+		return false;
+
+	dsc_common_caps->slice_caps.bits.NUM_SLICES_1 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_1 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_1;
+	dsc_common_caps->slice_caps.bits.NUM_SLICES_2 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_2 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_2;
+	dsc_common_caps->slice_caps.bits.NUM_SLICES_4 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_4 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_4;
+	dsc_common_caps->slice_caps.bits.NUM_SLICES_8 = dsc_sink_caps->slice_caps1.bits.NUM_SLICES_8 && dsc_enc_caps->slice_caps.bits.NUM_SLICES_8;
+	if (!dsc_common_caps->slice_caps.raw)
+		return false;
+
+	dsc_common_caps->lb_bit_depth = min(dsc_sink_caps->lb_bit_depth, dsc_enc_caps->lb_bit_depth);
+	if (!dsc_common_caps->lb_bit_depth)
+		return false;
+
+	dsc_common_caps->is_block_pred_supported = dsc_sink_caps->is_block_pred_supported && dsc_enc_caps->is_block_pred_supported;
+
+	dsc_common_caps->color_formats.raw = dsc_sink_caps->color_formats.raw & dsc_enc_caps->color_formats.raw;
+	if (!dsc_common_caps->color_formats.raw)
+		return false;
+
+	dsc_common_caps->color_depth.raw = dsc_sink_caps->color_depth.raw & dsc_enc_caps->color_depth.raw;
+	if (!dsc_common_caps->color_depth.raw)
+		return false;
+
+	max_slices = 0;
+	if (dsc_common_caps->slice_caps.bits.NUM_SLICES_1)
+		max_slices = 1;
+
+	if (dsc_common_caps->slice_caps.bits.NUM_SLICES_2)
+		max_slices = 2;
+
+	if (dsc_common_caps->slice_caps.bits.NUM_SLICES_4)
+		max_slices = 4;
+
+	total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_0_mps;
+	if (pixel_encoding == PIXEL_ENCODING_YCBCR422 || pixel_encoding == PIXEL_ENCODING_YCBCR420)
+		total_sink_throughput = max_slices * dsc_sink_caps->throughput_mode_1_mps;
+
+	dsc_common_caps->max_total_throughput_mps = min(total_sink_throughput, dsc_enc_caps->max_total_throughput_mps);
+
+	dsc_common_caps->max_slice_width = min(dsc_sink_caps->max_slice_width, dsc_enc_caps->max_slice_width);
+	if (!dsc_common_caps->max_slice_width)
+		return false;
+
+	dsc_common_caps->bpp_increment_div = min(dsc_sink_caps->bpp_increment_div, dsc_enc_caps->bpp_increment_div);
+
+	return true;
+}
+
+// TODO DSC: Can this be moved to a common helper module and replace WindowsDM::calcRequiredBandwidthForTiming()?
+static int bpp_from_dc_color_depth(enum dc_color_depth color_depth)
+{
+	int bits_per_pixel;
+
+	// Get color depth in bits per pixel
+	switch (color_depth) {
+	case COLOR_DEPTH_UNDEFINED:
+		bits_per_pixel = 0;
+		break;
+	case COLOR_DEPTH_666:
+		bits_per_pixel = 6;
+		break;
+	case COLOR_DEPTH_888:
+		bits_per_pixel = 8;
+		break;
+	case COLOR_DEPTH_101010:
+		bits_per_pixel = 10;
+		break;
+	case COLOR_DEPTH_121212:
+		bits_per_pixel = 12;
+		break;
+	case COLOR_DEPTH_141414:
+		bits_per_pixel = 14;
+		break;
+	case COLOR_DEPTH_161616:
+		bits_per_pixel = 16;
+		break;
+	case COLOR_DEPTH_999:
+		bits_per_pixel = 9;
+		break;
+	case COLOR_DEPTH_111111:
+		bits_per_pixel = 11;
+		break;
+	case COLOR_DEPTH_COUNT:
+	default:
+		bits_per_pixel = 0;
+		break;
+	}
+
+	return bits_per_pixel;
+}
+
+// TODO DSC: Can this be moved to a common helper module and replace WindowsDM::calcRequiredBandwidthForTiming()?
+static int calc_required_bandwidth_for_timing(const struct dc_crtc_timing *crtc_timing)
+{
+	int timing_bandwidth_kbps = 0;
+	int bits_per_pixel = bpp_from_dc_color_depth(crtc_timing->display_color_depth);
+
+	if (crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB ||
+		crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR444)
+		timing_bandwidth_kbps = crtc_timing->pix_clk_100hz * bits_per_pixel * 3 / 10;
+	else if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR422)
+		timing_bandwidth_kbps = crtc_timing->pix_clk_100hz * 8 * 3 / 10;
+	else if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
+		timing_bandwidth_kbps = crtc_timing->pix_clk_100hz * bits_per_pixel * 3 / 20;
+
+	return timing_bandwidth_kbps;
+}
+
+struct dc_dsc_policy {
+	float max_compression_ratio_legacy;
+	float sst_compression_legacy; // Maximum quality if 0.0
+	float mst_compression_legacy;
+	bool use_min_slices_h;
+	int max_slices_h; // Maximum available if 0
+	int num_slices_v;
+	int max_target_bpp;
+	int min_target_bpp; // Minimum target bits per pixel
+};
+
+static inline uint32_t dsc_round_up(uint32_t value)
+{
+	return (value + 9) / 10;
+}
+
+static inline uint32_t calc_dsc_bpp_x16(uint32_t stream_bandwidth_kbps, uint32_t pix_clk_100hz, uint32_t bpp_increment_div)
+{
+	uint32_t dsc_target_bpp_x16;
+	float f_dsc_target_bpp;
+	float f_stream_bandwidth_100bps = stream_bandwidth_kbps * 10.0f;
+	uint32_t precision = bpp_increment_div; // bpp_increment_div is actually precision
+
+	f_dsc_target_bpp = f_stream_bandwidth_100bps / pix_clk_100hz;
+
+	// Round down to the nearest precision stop to bring it into DSC spec range
+	dsc_target_bpp_x16 = (uint32_t)(f_dsc_target_bpp * precision);
+	dsc_target_bpp_x16 = (dsc_target_bpp_x16 * 16) / precision;
+
+	return dsc_target_bpp_x16;
+}
+
+const struct dc_dsc_policy dsc_policy = {
+	.max_compression_ratio_legacy = 3.0f, // DSC Policy: Limit compression to 3:1 at most in all cases
+	.sst_compression_legacy = 0.0f, // DSC Policy: SST - Maximum quality (0.0)
+	.mst_compression_legacy = 3.0f, // DSC Policy: MST - always 3:1 compression
+	.use_min_slices_h = true, // DSC Policy: Use minimum number of slices that fits the pixel clock
+	.max_slices_h = 0, // DSC Policy: Use max available slices (in our case 4 for or 8, depending on the mode)
+
+	/* DSC Policy: Number of vertical slices set to 2 for no particular reason.
+	 * Seems small enough to not affect the quality too much, while still providing some error
+	 * propagation control (which may also help debugging).
+	 */
+	.num_slices_v = 16,
+	.max_target_bpp = 24,
+	.min_target_bpp = 8,
+};
+
+static void get_dsc_bandwidth_range(
+		const struct dc_dsc_policy *policy,
+		const struct dsc_enc_caps *dsc_caps,
+		const struct dc_crtc_timing *timing,
+		struct dc_dsc_bw_range *range)
+{
+	/* native stream bandwidth */
+	range->stream_kbps = calc_required_bandwidth_for_timing(timing);
+
+	/* max dsc target bpp */
+	range->max_kbps = dsc_round_up(policy->max_target_bpp * timing->pix_clk_100hz);
+	range->max_target_bpp_x16 = policy->max_target_bpp * 16;
+	if (range->max_kbps > range->stream_kbps) {
+		/* max dsc target bpp is capped to native bandwidth */
+		range->max_kbps = range->stream_kbps;
+		range->max_target_bpp_x16 = calc_dsc_bpp_x16(range->stream_kbps, timing->pix_clk_100hz, dsc_caps->bpp_increment_div);
+	}
+
+	/* min dsc target bpp */
+	range->min_kbps = dsc_round_up(policy->min_target_bpp * timing->pix_clk_100hz);
+	range->min_target_bpp_x16 = policy->min_target_bpp * 16;
+	if (range->min_kbps > range->max_kbps) {
+		/* min dsc target bpp is capped to max dsc bandwidth*/
+		range->min_kbps = range->max_kbps;
+		range->min_target_bpp_x16 = range->max_target_bpp_x16;
+	}
+}
+
+static bool decide_dsc_target_bpp_x16(
+		const struct dc_dsc_policy *policy,
+		const struct dsc_enc_caps *dsc_common_caps,
+		const int target_bandwidth,
+		const struct dc_crtc_timing *timing,
+		int *target_bpp_x16)
+{
+	bool should_use_dsc = false;
+	struct dc_dsc_bw_range range;
+	float target_bandwidth_kbps = target_bandwidth * 0.97f; // 3% overhead for FEC
+
+	memset(&range, 0, sizeof(range));
+
+	get_dsc_bandwidth_range(policy, dsc_common_caps, timing, &range);
+	if (target_bandwidth_kbps >= range.stream_kbps) {
+		/* enough bandwidth without dsc */
+		*target_bpp_x16 = 0;
+		should_use_dsc = false;
+	} else if (target_bandwidth_kbps >= range.max_kbps) {
+		/* use max target bpp allowed */
+		*target_bpp_x16 = range.max_target_bpp_x16;
+		should_use_dsc = true;
+	} else if (target_bandwidth_kbps >= range.min_kbps) {
+		/* use target bpp that can take entire target bandwidth */
+		*target_bpp_x16 = calc_dsc_bpp_x16(target_bandwidth_kbps, timing->pix_clk_100hz, dsc_common_caps->bpp_increment_div);
+		should_use_dsc = true;
+	} else {
+		/* not enough bandwidth to fulfill minimum requirement */
+		*target_bpp_x16 = 0;
+		should_use_dsc = false;
+	}
+
+	return should_use_dsc;
+}
+
+
+#define MIN_AVAILABLE_SLICES_SIZE  4
+
+static int get_available_dsc_slices(union dsc_enc_slice_caps slice_caps, int *available_slices)
+{
+	int idx = 0;
+
+	memset(available_slices, -1, MIN_AVAILABLE_SLICES_SIZE);
+
+	if (slice_caps.bits.NUM_SLICES_1)
+		available_slices[idx++] = 1;
+
+	if (slice_caps.bits.NUM_SLICES_2)
+		available_slices[idx++] = 2;
+
+	if (slice_caps.bits.NUM_SLICES_4)
+		available_slices[idx++] = 4;
+
+	if (slice_caps.bits.NUM_SLICES_8)
+		available_slices[idx++] = 8;
+
+	return idx;
+}
+
+
+static int get_max_dsc_slices(union dsc_enc_slice_caps slice_caps)
+{
+	int max_slices = 0;
+	int available_slices[MIN_AVAILABLE_SLICES_SIZE];
+	int end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
+
+	if (end_idx > 0)
+		max_slices = available_slices[end_idx - 1];
+
+	return max_slices;
+}
+
+
+// Increment sice number in available sice numbers stops if possible, or just increment if not
+static int inc_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices)
+{
+	// Get next bigger num slices available in common caps
+	int available_slices[MIN_AVAILABLE_SLICES_SIZE];
+	int end_idx;
+	int i;
+	int new_num_slices = num_slices;
+
+	end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
+	if (end_idx == 0) {
+		// No available slices found
+		new_num_slices++;
+		return new_num_slices;
+	}
+
+	// Numbers of slices found - get the next bigger number
+	for (i = 0; i < end_idx; i++) {
+		if (new_num_slices < available_slices[i]) {
+			new_num_slices = available_slices[i];
+			break;
+		}
+	}
+
+	if (new_num_slices == num_slices) // No biger number of slices found
+		new_num_slices++;
+
+	return new_num_slices;
+}
+
+
+// Decrement sice number in available sice numbers stops if possible, or just decrement if not. Stop at zero.
+static int dec_num_slices(union dsc_enc_slice_caps slice_caps, int num_slices)
+{
+	// Get next bigger num slices available in common caps
+	int available_slices[MIN_AVAILABLE_SLICES_SIZE];
+	int end_idx;
+	int i;
+	int new_num_slices = num_slices;
+
+	end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
+	if (end_idx == 0 && new_num_slices > 0) {
+		// No numbers of slices found
+		new_num_slices++;
+		return new_num_slices;
+	}
+
+	// Numbers of slices found - get the next smaller number
+	for (i = end_idx - 1; i >= 0; i--) {
+		if (new_num_slices > available_slices[i]) {
+			new_num_slices = available_slices[i];
+			break;
+		}
+	}
+
+	if (new_num_slices == num_slices) {
+		// No smaller number of slices found
+		new_num_slices--;
+		if (new_num_slices < 0)
+			new_num_slices = 0;
+	}
+
+	return new_num_slices;
+}
+
+
+// Choose next bigger number of slices if the requested number of slices is not available
+static int fit_num_slices_up(union dsc_enc_slice_caps slice_caps, int num_slices)
+{
+	// Get next bigger num slices available in common caps
+	int available_slices[MIN_AVAILABLE_SLICES_SIZE];
+	int end_idx;
+	int i;
+	int new_num_slices = num_slices;
+
+	end_idx = get_available_dsc_slices(slice_caps, &available_slices[0]);
+	if (end_idx == 0) {
+		// No available slices found
+		new_num_slices++;
+		return new_num_slices;
+	}
+
+	// Numbers of slices found - get the equal or next bigger number
+	for (i = 0; i < end_idx; i++) {
+		if (new_num_slices <= available_slices[i]) {
+			new_num_slices = available_slices[i];
+			break;
+		}
+	}
+
+	return new_num_slices;
+}
+
+
+/* Attempts to set DSC configuration for the stream, applying DSC policy.
+ * Returns 'true' if successful or 'false' if not.
+ *
+ * Parameters:
+ *
+ * dsc_sink_caps       - DSC sink decoder capabilities (from DPCD)
+ *
+ * dsc_enc_caps        - DSC encoder capabilities
+ *
+ * target_bandwidth    - Target bandwidth to fit the stream into.
+ *                       If 0, use maximum compression as per DSC policy.
+ *
+ * timing              - The stream timing to fit into 'target_bandwidth' or apply
+ *                       maximum compression to, if 'target_badwidth == 0'
+ *
+ * dsc_cfg             - DSC configuration to use if it was possible to come up with
+ *                       one for the given inputs.
+ *                       The target bitrate after DSC can be calculated by multiplying
+ *                       dsc_cfg.bits_per_pixel (in U6.4 format) by pixel rate, e.g.
+ *
+ *                       dsc_stream_bitrate_kbps = (int)ceil(timing->pix_clk_khz * dsc_cfg.bits_per_pixel / 16.0);
+ */
+static bool setup_dsc_config(
+		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
+		const struct dsc_enc_caps *dsc_enc_caps,
+		int target_bandwidth,
+		const struct dc_crtc_timing *timing,
+		struct dc_dsc_config *dsc_cfg)
+{
+	struct dsc_enc_caps dsc_common_caps;
+	int max_slices_h;
+	int min_slices_h;
+	int num_slices_h;
+	int pic_width;
+	int slice_width;
+	int target_bpp;
+	int sink_per_slice_throughput;
+	// TODO DSC: See if it makes sense to use 2.4% for SST
+	bool is_dsc_possible = false;
+	int num_slices_v;
+	int pic_height;
+
+	memset(dsc_cfg, 0, sizeof(struct dc_dsc_config));
+
+	if (!dsc_sink_caps->is_dsc_supported)
+		goto done;
+
+	// Intersect decoder with encoder DSC caps and validate DSC settings
+	is_dsc_possible = dc_intersect_dsc_caps(dsc_sink_caps, dsc_enc_caps, timing->pixel_encoding, &dsc_common_caps);
+	if (!is_dsc_possible)
+		goto done;
+
+	if (target_bandwidth > 0) {
+		is_dsc_possible = decide_dsc_target_bpp_x16(&dsc_policy, &dsc_common_caps, target_bandwidth, timing, &target_bpp);
+	} else if (timing->pix_clk_100hz * 12 <= calc_required_bandwidth_for_timing(timing) * 10) {
+		/* use 12 target bpp for MST display
+		 * TODO: implement new MST DSC target bpp policy */
+		target_bpp = 16*12;
+		is_dsc_possible = true;
+	} else {
+		is_dsc_possible = false;
+	}
+
+	if (!is_dsc_possible)
+		goto done;
+
+	dsc_cfg->bits_per_pixel = target_bpp;
+
+	sink_per_slice_throughput = 0;
+
+	// Validate available DSC settings against the mode timing
+
+	// Color format
+	dsc_cfg->ycbcr422_simple = false;
+	switch (timing->pixel_encoding)	{
+	case PIXEL_ENCODING_RGB:
+		is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.RGB;
+		sink_per_slice_throughput = dsc_sink_caps->throughput_mode_0_mps;
+		break;
+	case PIXEL_ENCODING_YCBCR444:
+		is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_444;
+		sink_per_slice_throughput = dsc_sink_caps->throughput_mode_0_mps;
+		break;
+	case PIXEL_ENCODING_YCBCR422: {
+			is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_422;
+			sink_per_slice_throughput = dsc_sink_caps->throughput_mode_1_mps;
+			if (!is_dsc_possible) {
+				is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_SIMPLE_422;
+				dsc_cfg->ycbcr422_simple = is_dsc_possible;
+				sink_per_slice_throughput = dsc_sink_caps->throughput_mode_0_mps;
+			}
+		}
+		break;
+	case PIXEL_ENCODING_YCBCR420:
+		is_dsc_possible = (bool)dsc_common_caps.color_formats.bits.YCBCR_NATIVE_420;
+		sink_per_slice_throughput = dsc_sink_caps->throughput_mode_1_mps;
+		break;
+	default:
+		is_dsc_possible = false;
+	}
+
+	if (!is_dsc_possible)
+		goto done;
+
+	// Color depth
+	switch (timing->display_color_depth) {
+	case COLOR_DEPTH_888:
+		is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_8_BPC;
+		break;
+	case COLOR_DEPTH_101010:
+		is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_10_BPC;
+		break;
+	case COLOR_DEPTH_121212:
+		is_dsc_possible = (bool)dsc_common_caps.color_depth.bits.COLOR_DEPTH_12_BPC;
+		break;
+	default:
+		is_dsc_possible = false;
+	}
+
+	if (!is_dsc_possible)
+		goto done;
+
+	// DSC slicing
+	max_slices_h = get_max_dsc_slices(dsc_common_caps.slice_caps);
+
+	pic_width = timing->h_addressable + timing->h_border_left + timing->h_border_right;
+	while (max_slices_h > 0) {
+		if (pic_width % max_slices_h == 0)
+			break;
+
+		max_slices_h = dec_num_slices(dsc_common_caps.slice_caps, max_slices_h);
+	}
+
+	is_dsc_possible = (dsc_common_caps.max_slice_width > 0);
+	if (!is_dsc_possible)
+		goto done;
+
+	min_slices_h = pic_width / dsc_common_caps.max_slice_width;
+	if (pic_width % dsc_common_caps.max_slice_width)
+		min_slices_h++;
+
+	min_slices_h = fit_num_slices_up(dsc_common_caps.slice_caps, min_slices_h);
+
+	while (min_slices_h <= max_slices_h) {
+		if (dsc_round_up(timing->pix_clk_100hz) / (min_slices_h) <= sink_per_slice_throughput * 1000)
+			break;
+
+		min_slices_h = inc_num_slices(dsc_common_caps.slice_caps, min_slices_h);
+	}
+
+	if (pic_width % min_slices_h != 0)
+		min_slices_h = 0; // DSC TODO: Maybe try increasing the number of slices first?
+
+	is_dsc_possible = (min_slices_h <= max_slices_h);
+	if (!is_dsc_possible)
+		goto done;
+
+	if (dsc_policy.use_min_slices_h) {
+		if (min_slices_h > 0)
+			num_slices_h = min_slices_h;
+		else if (max_slices_h > 0) { // Fall back to max slices if min slices is not working out
+			if (dsc_policy.max_slices_h)
+				num_slices_h = min(dsc_policy.max_slices_h, max_slices_h);
+			else
+				num_slices_h = max_slices_h;
+		} else
+			is_dsc_possible = false;
+	} else {
+		if (max_slices_h > 0) {
+			if (dsc_policy.max_slices_h)
+				num_slices_h = min(dsc_policy.max_slices_h, max_slices_h);
+			else
+				num_slices_h = max_slices_h;
+		} else if (min_slices_h > 0) // Fall back to min slices if max slices is not possible
+			num_slices_h = min_slices_h;
+		else
+			is_dsc_possible = false;
+	}
+
+	if (!is_dsc_possible)
+		goto done;
+
+	dsc_cfg->num_slices_h = num_slices_h;
+	slice_width = pic_width / num_slices_h;
+
+	// Vertical number of slices: start from policy and pick the first one that height is divisible by
+	pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom;
+	num_slices_v = dsc_policy.num_slices_v;
+	if (num_slices_v < 1)
+		num_slices_v = 1;
+
+	while (num_slices_v >= 1 && (pic_height % num_slices_v != 0))
+		num_slices_v--;
+
+	dsc_cfg->num_slices_v = num_slices_v;
+
+	is_dsc_possible = slice_width <= dsc_common_caps.max_slice_width;
+	if (!is_dsc_possible)
+		goto done;
+
+	// Final decission: can we do DSC or not?
+	if (is_dsc_possible) {
+		// Fill out the rest of DSC settings
+		dsc_cfg->block_pred_enable = dsc_common_caps.is_block_pred_supported;
+		dsc_cfg->linebuf_depth = dsc_common_caps.lb_bit_depth;
+		dsc_cfg->version_minor = (dsc_common_caps.dsc_version & 0xf0) >> 4;
+	}
+
+done:
+	if (!is_dsc_possible)
+		memset(dsc_cfg, 0, sizeof(struct dc_dsc_config));
+
+	return is_dsc_possible;
+}
+
+bool dc_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;
+}
+
+
+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 is_dsc_possible = false;
+	struct dsc_enc_caps dsc_enc_caps;
+	struct dsc_enc_caps dsc_common_caps;
+	get_dsc_enc_caps(dc, &dsc_enc_caps, timing->pix_clk_100hz);
+	is_dsc_possible = dc_intersect_dsc_caps(dsc_sink_caps, &dsc_enc_caps, timing->pixel_encoding, &dsc_common_caps);
+	if (is_dsc_possible)
+		get_dsc_bandwidth_range(&dsc_policy, &dsc_common_caps, timing, range);
+	return is_dsc_possible;
+}
+
+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 is_dsc_possible = false;
+
+	struct dsc_enc_caps dsc_enc_caps;
+	struct dsc_enc_caps dsc_common_caps;
+
+	get_dsc_enc_caps(dc, &dsc_enc_caps, timing->pix_clk_100hz);
+	is_dsc_possible = dc_intersect_dsc_caps(dsc_sink_caps, &dsc_enc_caps,
+			timing->pixel_encoding, &dsc_common_caps);
+	if (is_dsc_possible)
+		is_dsc_possible = setup_dsc_config(dsc_sink_caps,
+				&dsc_enc_caps,
+				target_bandwidth,
+				timing, dsc_cfg);
+	return is_dsc_possible;
+}
+
+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)
+{
+	int requiredBandwidth_Kbps;
+	bool stream_fits_into_bandwidth = false;
+	int link_rate_kbytes_per_sec = link->verified_link_cap.link_rate * LINK_RATE_REF_FREQ_IN_KHZ;
+	int total_link_bandwdith_kbps = link->verified_link_cap.lane_count * link_rate_kbytes_per_sec * 8;
+
+	if (link->preferred_link_setting.lane_count !=
+			LANE_COUNT_UNKNOWN &&
+			link->preferred_link_setting.link_rate !=
+					LINK_RATE_UNKNOWN) {
+		link_rate_kbytes_per_sec =  link->preferred_link_setting.link_rate * LINK_RATE_REF_FREQ_IN_KHZ;
+		total_link_bandwdith_kbps =  link->preferred_link_setting.lane_count * link_rate_kbytes_per_sec * 8;
+	}
+
+	timing->flags.DSC = 0;
+	requiredBandwidth_Kbps = calc_required_bandwidth_for_timing(timing);
+
+	if (total_link_bandwdith_kbps >= requiredBandwidth_Kbps)
+		stream_fits_into_bandwidth = true;
+	else {
+		// There's not enough bandwidth in the link. See if DSC can be used to resolve this.
+		int link_bandwidth_kbps = link->type == dc_connection_mst_branch ? 0 : total_link_bandwdith_kbps;
+
+		stream_fits_into_bandwidth = dc_setup_dsc_in_timing_legacy(pDC, &link->dpcd_caps.dsc_sink_caps, link_bandwidth_kbps, timing);
+	}
+
+	return stream_fits_into_bandwidth;
+}
+
+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)
+{
+	bool isDscOK = false;
+	struct dsc_enc_caps dsc_enc_caps;
+
+	timing->flags.DSC = 0;
+	get_dsc_enc_caps(pDC, &dsc_enc_caps, timing->pix_clk_100hz);
+	if (dsc_enc_caps.dsc_version) {
+		struct dc_dsc_config dscCfg = {0};
+
+		isDscOK = setup_dsc_config(dsc_sink_caps, &dsc_enc_caps, available_bandwidth_kbps, timing, &dscCfg);
+
+		memcpy(&timing->dsc_cfg, &dscCfg, sizeof(dscCfg));
+		timing->flags.DSC = isDscOK ? 1 : 0;
+	}
+
+	return isDscOK;
+}
+#endif /* CONFIG_DRM_AMD_DC_DSC_SUPPORT */