[Intel-gfx] [PATCH v11 06/11] drm/i915/dp: Consider output_format while computing dsc bpp for mode_valid

[Ankit Nautiyal]

During modevalid step, the pipe bpp is computed assuming RGB output
format. When checking with DSC, consider the output_format and compute
the input bpp for DSC appropriately.

v2: For DP-MST we currently use RGB output format only, so continue
using RGB while computing dsc_bpp for MST case.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp.c     | 28 ++++++++++++++++-----
 drivers/gpu/drm/i915/display/intel_dp.h     |  4 ++-
 drivers/gpu/drm/i915/display/intel_dp_mst.c |  2 +-
 3 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index dcb3c2519041..499390c519ca 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -1110,11 +1110,21 @@ intel_dp_mode_valid(struct drm_connector *_connector,
 
 	if (HAS_DSC(dev_priv) &&
 	    drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) {
+		int pipe_bpp;
+		enum intel_output_format output_format, sink_format;
+		const struct drm_display_info *info = &connector->base.display_info;
+
+		if (drm_mode_is_420_only(info, mode))
+			sink_format = INTEL_OUTPUT_FORMAT_YCBCR420;
+		else
+			sink_format = INTEL_OUTPUT_FORMAT_RGB;
+
+		output_format = intel_dp_output_format(connector, sink_format);
 		/*
 		 * TBD pass the connector BPC,
 		 * for now U8_MAX so that max BPC on that platform would be picked
 		 */
-		int pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, U8_MAX);
+		pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, output_format, U8_MAX);
 
 		/*
 		 * Output bpp is stored in 6.4 format so right shift by 4 to get the
@@ -1454,12 +1464,15 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp,
 	return -EINVAL;
 }
 
-int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 max_req_bpc)
+int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp,
+			     enum intel_output_format output_format,
+			     u8 max_req_bpc)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	int i, num_bpc;
 	u8 dsc_bpc[3] = {0};
 	u8 dsc_max_bpc;
+	int pipe_bpp = 0;
 
 	/* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */
 	if (DISPLAY_VER(i915) >= 12)
@@ -1470,11 +1483,13 @@ int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 max_req_bpc)
 	num_bpc = drm_dp_dsc_sink_supported_input_bpcs(intel_dp->dsc_dpcd,
 						       dsc_bpc);
 	for (i = 0; i < num_bpc; i++) {
-		if (dsc_max_bpc >= dsc_bpc[i])
-			return dsc_bpc[i] * 3;
+		if (dsc_max_bpc >= dsc_bpc[i]) {
+			pipe_bpp = dsc_bpc[i] * 3;
+			break;
+		}
 	}
 
-	return 0;
+	return intel_dp_output_bpp(output_format, pipe_bpp);
 }
 
 static int intel_dp_source_dsc_version_minor(struct intel_dp *intel_dp)
@@ -1588,7 +1603,8 @@ int intel_dp_dsc_compute_config(struct intel_dp *intel_dp,
 		return -EINVAL;
 
 	if (compute_pipe_bpp)
-		pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, conn_state->max_requested_bpc);
+		pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, pipe_config->output_format,
+						    conn_state->max_requested_bpc);
 	else
 		pipe_bpp = pipe_config->pipe_bpp;
 
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index ef39e4f7a329..2f4136e43f38 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -102,7 +102,9 @@ void intel_read_dp_sdp(struct intel_encoder *encoder,
 		       struct intel_crtc_state *crtc_state,
 		       unsigned int type);
 bool intel_digital_port_connected(struct intel_encoder *encoder);
-int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc);
+int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp,
+			     enum intel_output_format output_format,
+			     u8 dsc_max_bpc);
 u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915,
 				u32 link_clock, u32 lane_count,
 				u32 mode_clock, u32 mode_hdisplay,
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index ff0b821a901a..bdc5c53ccd75 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -917,7 +917,7 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector,
 		 * TBD pass the connector BPC,
 		 * for now U8_MAX so that max BPC on that platform would be picked
 		 */
-		int pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, U8_MAX);
+		int pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, INTEL_OUTPUT_FORMAT_RGB, U8_MAX);
 
 		if (drm_dp_sink_supports_fec(intel_dp->fec_capable)) {
 			dsc_max_output_bpp =
-- 
2.25.1