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drm/i915/dp: Require a HDMI sink for YCbCr output via PCON

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DVI sinks can't deal with YCbCr. Make sure we have a HDMI sink connected
after the PCON before doing YCbCr 4:2:0 output.

Cc: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260409101539.22032-7-ville.syrjala@linux.intel.com
Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
This commit is contained in:
Ville Syrjälä 2026-04-09 13:15:36 +03:00
parent dfe1879a88
commit 4802b7b6c0
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/display/intel_dp.c
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@ -1349,10 +1349,15 @@ intel_dp_sink_format_valid(struct intel_connector *connector,
const struct drm_display_mode *mode,
enum intel_output_format sink_format)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
const struct drm_display_info *info = &connector->base.display_info;
switch (sink_format) {
case INTEL_OUTPUT_FORMAT_YCBCR420:
if (intel_dp->dfp.min_tmds_clock &&
!intel_dp_has_hdmi_sink(intel_dp))
return MODE_NO_420;
if (!connector->base.ycbcr_420_allowed ||
!drm_mode_is_420(info, mode))
return MODE_NO_420;