drm/i915: Force RGB output for DVI sink

YCbCr output requires infoframes and whatnot, so don't allow
it when dealing with a DVI sink (or a HDMI sink we wish to
treat as DVI).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221107194604.15227-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 389fa36..523b707 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2191,9 +2191,13 @@ static bool intel_hdmi_has_audio(struct intel_encoder *encoder,
 }
 
 static enum intel_output_format
-intel_hdmi_output_format(struct intel_connector *connector,
+intel_hdmi_output_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;
+
        if (connector->base.ycbcr_420_allowed && ycbcr_420_output)
                return INTEL_OUTPUT_FORMAT_YCBCR420;
        else
@@ -2212,7 +2216,8 @@ 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(connector, ycbcr_420_only);
+       crtc_state->output_format =
+               intel_hdmi_output_format(crtc_state, connector, ycbcr_420_only);
 
        if (ycbcr_420_only && !intel_hdmi_is_ycbcr420(crtc_state)) {
                drm_dbg_kms(&i915->drm,
@@ -2227,7 +2232,7 @@ static int intel_hdmi_compute_output_format(struct intel_encoder *encoder,
                    !drm_mode_is_420_also(info, adjusted_mode))
                        return ret;
 
-               crtc_state->output_format = intel_hdmi_output_format(connector, true);
+               crtc_state->output_format = intel_hdmi_output_format(crtc_state, connector, true);
                ret = intel_hdmi_compute_clock(encoder, crtc_state, respect_downstream_limits);
        }