drm/i915/display: Add new member to configure PCON color conversion

The decision to use DFP output format conversion capabilities should be
during compute_config phase.

This patch adds new member to crtc_state to represent the final
output_format to the sink. In case of a DFP this can be different than
the output_format, as per the format conversion done via the PCON.

This will help to store only the format conversion capabilities of the
DP device in intel_dp->dfp, and use crtc_state to compute and store the
configuration for color/format conversion for a given mode.

v2: modified the new member to crtc_state to represent the final
output_format that eaches the sink, after possible conversion by
PCON kind of devices. (Ville)

v3: Addressed comments from Ville:
-Added comments to clarify difference between sink_format and
output_format.
-Corrected the order of setting sink_format and output_format.
-Added readout for sink_format in get_pipe_config hooks.

v4: Set sink_format for intel_sdvo too. (Ville)

v5: Rebased.

v6: Fixed condition to go for YCbCr420 format for dp and hdmi. (Ville)

v7: Fix the condition to set sink_format for HDMI.
Set hdmi output_format simply as sink_format. (Ville)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> (v3)
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230427125605.487769-2-ankit.k.nautiyal@intel.com

1 files changed, 18 insertions, 9 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 6ebdea722c845..dea45c2ecde5e 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2172,9 +2172,9 @@ static bool intel_hdmi_has_audio(struct intel_encoder *encoder,
 }
 
 static enum intel_output_format
-intel_hdmi_output_format(const struct intel_crtc_state *crtc_state,
-			 struct intel_connector *connector,
-			 bool ycbcr_420_output)
+intel_hdmi_sink_format(const struct intel_crtc_state *crtc_state,
+		       struct intel_connector *connector,
+		       bool ycbcr_420_output)
 {
 	if (!crtc_state->has_hdmi_sink)
 		return INTEL_OUTPUT_FORMAT_RGB;
@@ -2185,6 +2185,12 @@ intel_hdmi_output_format(const struct intel_crtc_state *crtc_state,
 		return INTEL_OUTPUT_FORMAT_RGB;
 }
 
+static enum intel_output_format
+intel_hdmi_output_format(const struct intel_crtc_state *crtc_state)
+{
+	return crtc_state->sink_format;
+}
+
 static int intel_hdmi_compute_output_format(struct intel_encoder *encoder,
 					    struct intel_crtc_state *crtc_state,
 					    const struct drm_connector_state *conn_state,
@@ -2197,23 +2203,26 @@ static int intel_hdmi_compute_output_format(struct intel_encoder *encoder,
 	bool ycbcr_420_only = drm_mode_is_420_only(info, adjusted_mode);
 	int ret;
 
-	crtc_state->output_format =
-		intel_hdmi_output_format(crtc_state, connector, ycbcr_420_only);
+	crtc_state->sink_format =
+		intel_hdmi_sink_format(crtc_state, connector, ycbcr_420_only);
 
-	if (ycbcr_420_only && !intel_hdmi_is_ycbcr420(crtc_state)) {
+	if (ycbcr_420_only && crtc_state->sink_format != INTEL_OUTPUT_FORMAT_YCBCR420) {
 		drm_dbg_kms(&i915->drm,
 			    "YCbCr 4:2:0 mode but YCbCr 4:2:0 output not possible. Falling back to RGB.\n");
-		crtc_state->output_format = INTEL_OUTPUT_FORMAT_RGB;
+		crtc_state->sink_format = INTEL_OUTPUT_FORMAT_RGB;
 	}
 
+	crtc_state->output_format = intel_hdmi_output_format(crtc_state);
 	ret = intel_hdmi_compute_clock(encoder, crtc_state, respect_downstream_limits);
 	if (ret) {
-		if (intel_hdmi_is_ycbcr420(crtc_state) ||
+		if (crtc_state->sink_format == INTEL_OUTPUT_FORMAT_YCBCR420 ||
+		    !crtc_state->has_hdmi_sink ||
 		    !connector->base.ycbcr_420_allowed ||
 		    !drm_mode_is_420_also(info, adjusted_mode))
 			return ret;
 
-		crtc_state->output_format = intel_hdmi_output_format(crtc_state, connector, true);
+		crtc_state->sink_format = INTEL_OUTPUT_FORMAT_YCBCR420;
+		crtc_state->output_format = intel_hdmi_output_format(crtc_state);
 		ret = intel_hdmi_compute_clock(encoder, crtc_state, respect_downstream_limits);
 	}