1 files changed, 78 insertions, 27 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
index e60f760585e4..d2423ad1fac2 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -22,27 +22,10 @@
  * Author: AMD
  */
 
-#ifdef CONFIG_DRM_AMD_DC_DSC_SUPPORT
 #include "dc_hw_types.h"
 #include "dsc.h"
 #include <drm/drm_dp_helper.h>
-
-struct dc_dsc_policy {
-	bool use_min_slices_h;
-	int max_slices_h; // Maximum available if 0
-	int min_sice_height; // Must not be less than 8
-	int max_target_bpp;
-	int min_target_bpp; // Minimum target bits per pixel
-};
-
-const struct dc_dsc_policy dsc_policy = {
-	.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)
-	.min_sice_height = 108, // DSC Policy: Use slice height recommended by VESA DSC Spreadsheet user guide
-	.max_target_bpp = 16,
-	.min_target_bpp = 8,
-};
-
+#include "dc.h"
 
 /* This module's internal functions */
 
@@ -237,8 +220,11 @@ static void get_dsc_enc_caps(
 	// This is a static HW query, so we can use any DSC
 
 	memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps));
-	if (dsc)
+	if (dsc) {
 		dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz);
+		if (dsc->ctx->dc->debug.native422_support)
+			dsc_enc_caps->color_formats.bits.YCBCR_NATIVE_422 = 1;
+	}
 }
 
 /* Returns 'false' if no intersection was found for at least one capablity.
@@ -578,9 +564,11 @@ static bool setup_dsc_config(
 	bool is_dsc_possible = false;
 	int pic_height;
 	int slice_height;
+	struct dc_dsc_policy policy;
 
 	memset(dsc_cfg, 0, sizeof(struct dc_dsc_config));
 
+	dc_dsc_get_policy_for_timing(timing, &policy);
 	pic_width = timing->h_addressable + timing->h_border_left + timing->h_border_right;
 	pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom;
 
@@ -596,7 +584,12 @@ static bool setup_dsc_config(
 		goto done;
 
 	if (target_bandwidth_kbps > 0) {
-		is_dsc_possible = decide_dsc_target_bpp_x16(&dsc_policy, &dsc_common_caps, target_bandwidth_kbps, timing, &target_bpp);
+		is_dsc_possible = decide_dsc_target_bpp_x16(
+				&policy,
+				&dsc_common_caps,
+				target_bandwidth_kbps,
+				timing,
+				&target_bpp);
 		dsc_cfg->bits_per_pixel = target_bpp;
 	}
 	if (!is_dsc_possible)
@@ -698,20 +691,20 @@ static bool setup_dsc_config(
 	if (!is_dsc_possible)
 		goto done;
 
-	if (dsc_policy.use_min_slices_h) {
+	if (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);
+			if (policy.max_slices_h)
+				num_slices_h = min(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);
+			if (policy.max_slices_h)
+				num_slices_h = min(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
@@ -733,7 +726,7 @@ static bool setup_dsc_config(
 	// Slice height (i.e. number of slices per column): start with policy and pick the first one that height is divisible by.
 	// For 4:2:0 make sure the slice height is divisible by 2 as well.
 	if (min_slice_height_override == 0)
-		slice_height = min(dsc_policy.min_sice_height, pic_height);
+		slice_height = min(policy.min_slice_height, pic_height);
 	else
 		slice_height = min(min_slice_height_override, pic_height);
 
@@ -903,4 +896,62 @@ bool dc_dsc_compute_config(
 			timing, dsc_min_slice_height_override, dsc_cfg);
 	return is_dsc_possible;
 }
-#endif /* CONFIG_DRM_AMD_DC_DSC_SUPPORT */
+
+void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, struct dc_dsc_policy *policy)
+{
+	uint32_t bpc = 0;
+
+	policy->min_target_bpp = 0;
+	policy->max_target_bpp = 0;
+
+	/* DSC Policy: Use minimum number of slices that fits the pixel clock */
+	policy->use_min_slices_h = true;
+
+	/* DSC Policy: Use max available slices
+	 * (in our case 4 for or 8, depending on the mode)
+	 */
+	policy->max_slices_h = 0;
+
+	/* DSC Policy: Use slice height recommended
+	 * by VESA DSC Spreadsheet user guide
+	 */
+	policy->min_slice_height = 108;
+
+	/* DSC Policy: follow DP specs with an internal upper limit to 16 bpp
+	 * for better interoperability
+	 */
+	switch (timing->display_color_depth) {
+	case COLOR_DEPTH_888:
+		bpc = 8;
+		break;
+	case COLOR_DEPTH_101010:
+		bpc = 10;
+		break;
+	case COLOR_DEPTH_121212:
+		bpc = 12;
+		break;
+	default:
+		return;
+	}
+	switch (timing->pixel_encoding) {
+	case PIXEL_ENCODING_RGB:
+	case PIXEL_ENCODING_YCBCR444:
+	case PIXEL_ENCODING_YCBCR422: /* assume no YCbCr422 native support */
+		/* DP specs limits to 8 */
+		policy->min_target_bpp = 8;
+		/* DP specs limits to 3 x bpc */
+		policy->max_target_bpp = 3 * bpc;
+		break;
+	case PIXEL_ENCODING_YCBCR420:
+		/* DP specs limits to 6 */
+		policy->min_target_bpp = 6;
+		/* DP specs limits to 1.5 x bpc assume bpc is an even number */
+		policy->max_target_bpp = bpc * 3 / 2;
+		break;
+	default:
+		return;
+	}
+	/* internal upper limit to 16 bpp */
+	if (policy->max_target_bpp > 16)
+		policy->max_target_bpp = 16;
+}