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drm/i915/dp: Make the RGB fallback for "4:2:0 only" modes the last resort

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Currently we take the Hail Mary RGB fallback for "4:2:0 only" modes
already during the first pass when respect_downstream_limits==true.
It seems better to try everything else first (like ignoring TMDS
clock limits) while still preferring 4:2:0, and only if everything
else has failed fall back to RGB.

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/20260409101539.22032-10-ville.syrjala@linux.intel.com
Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
This commit is contained in:
Ville Syrjälä 2026-04-09 13:15:39 +03:00
parent 654f795ca9
commit 86fe1ecdc4
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/display/intel_dp.c
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@ -3410,7 +3410,7 @@ intel_dp_compute_formats(struct intel_encoder *encoder,
respect_downstream_limits,
INTEL_OUTPUT_FORMAT_YCBCR420);
if (ret) {
if (ret && !respect_downstream_limits) {
drm_dbg_kms(display->drm,
"YCbCr 4:2:0 mode but YCbCr 4:2:0 output not possible. Falling back to RGB.\n");