drm/amd/display: Add an option to limit max DSC target bpp per sink

[Why] Can be used for debug purposes
[How] Add max target bpp override field and related handling

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 16 insertions, 8 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 4c844cfaa956..c62d0eddc9c6 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -545,6 +545,7 @@ static bool setup_dsc_config(
 		int target_bandwidth_kbps,
 		const struct dc_crtc_timing *timing,
 		int min_slice_height_override,
+		int max_dsc_target_bpp_limit_override,
 		struct dc_dsc_config *dsc_cfg)
 {
 	struct dsc_enc_caps dsc_common_caps;
@@ -563,7 +564,7 @@ static bool setup_dsc_config(
 
 	memset(dsc_cfg, 0, sizeof(struct dc_dsc_config));
 
-	dc_dsc_get_policy_for_timing(timing, &policy);
+	dc_dsc_get_policy_for_timing(timing, max_dsc_target_bpp_limit_override, &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;
 
@@ -863,9 +864,9 @@ bool dc_dsc_parse_dsc_dpcd(const struct dc *dc, const uint8_t *dpcd_dsc_basic_da
  */
 bool dc_dsc_compute_bandwidth_range(
 		const struct display_stream_compressor *dsc,
-		const uint32_t dsc_min_slice_height_override,
-		const uint32_t min_bpp,
-		const uint32_t max_bpp,
+		uint32_t dsc_min_slice_height_override,
+		uint32_t min_bpp,
+		uint32_t max_bpp,
 		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
 		const struct dc_crtc_timing *timing,
 		struct dc_dsc_bw_range *range)
@@ -882,7 +883,7 @@ bool dc_dsc_compute_bandwidth_range(
 
 	if (is_dsc_possible)
 		is_dsc_possible = setup_dsc_config(dsc_sink_caps, &dsc_enc_caps, 0, timing,
-				dsc_min_slice_height_override, &config);
+				dsc_min_slice_height_override, max_bpp, &config);
 
 	if (is_dsc_possible)
 		get_dsc_bandwidth_range(min_bpp, max_bpp, &dsc_common_caps, timing, range);
@@ -893,7 +894,8 @@ bool dc_dsc_compute_bandwidth_range(
 bool dc_dsc_compute_config(
 		const struct display_stream_compressor *dsc,
 		const struct dsc_dec_dpcd_caps *dsc_sink_caps,
-		const uint32_t dsc_min_slice_height_override,
+		uint32_t dsc_min_slice_height_override,
+		uint32_t max_target_bpp_limit_override,
 		uint32_t target_bandwidth_kbps,
 		const struct dc_crtc_timing *timing,
 		struct dc_dsc_config *dsc_cfg)
@@ -905,11 +907,12 @@ bool dc_dsc_compute_config(
 	is_dsc_possible = setup_dsc_config(dsc_sink_caps,
 			&dsc_enc_caps,
 			target_bandwidth_kbps,
-			timing, dsc_min_slice_height_override, dsc_cfg);
+			timing, dsc_min_slice_height_override,
+			max_target_bpp_limit_override, dsc_cfg);
 	return is_dsc_possible;
 }
 
-void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, struct dc_dsc_policy *policy)
+void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, uint32_t max_target_bpp_limit_override, struct dc_dsc_policy *policy)
 {
 	uint32_t bpc = 0;
 
@@ -963,10 +966,15 @@ void dc_dsc_get_policy_for_timing(const struct dc_crtc_timing *timing, struct dc
 	default:
 		return;
 	}
+
 	/* internal upper limit, default 16 bpp */
 	if (policy->max_target_bpp > dsc_policy_max_target_bpp_limit)
 		policy->max_target_bpp = dsc_policy_max_target_bpp_limit;
 
+	/* apply override */
+	if (max_target_bpp_limit_override && policy->max_target_bpp > max_target_bpp_limit_override)
+		policy->max_target_bpp = max_target_bpp_limit_override;
+
 	/* enable DSC when not needed, default false */
 	if (dsc_policy_enable_dsc_when_not_needed)
 		policy->enable_dsc_when_not_needed = dsc_policy_enable_dsc_when_not_needed;