Re: [PATCH v2 0/9] drm/i915/{dp, hdmi}: Restructure DP/HDMI sink format handling

Nicolas Frattaroli
2026-04-09T15:40:59Z

On Thursday, 9 April 2026 12:15:30 Central European Summer Time Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Restructure the DP/HDMI sink format handling. I got inspired to do this
> by https://lore.kernel.org/dri-devel/20260324-color-format-v11-8-605559af4fb4@collabora.com/
>
> I envision that after this the aforementioned patch could just
> become something like this:
>
> 1. s/intel_foo_compute_formats/intel_foo_compute_formats_auto/
> 2. Add a new intel_foo_compute_formats()
>
> intel_foo_compute_formats()
> {
> switch (color_format) {
> case YCBCR420:
> return intel_foo_compute_output_format(YCBCR420);
> case RGB:
> return intel_foo_compute_output_format(RGB);
> case AUTO:
> return intel_foo_compute_formats_auto();
> }
> }
>
> v2: A few more updates to the DP mode validation
>
> Cc: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> Cc: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
>
> Ville Syrjälä (9):
> drm/i915/hdmi: Add missing intel_pfit_mode_valid() for 4:2:0 also
> modes
> drm/i915/hdmi: Restructure the sink/output format selection
> drm/i915/hdmi: Restructure 4:2:0 vs. 4:4:4 mode validation
> drm/i915/dp: Restructure the sink/output format selection
> drm/i915/dp: Validate "4:2:0 also" modes twice
> drm/i915/dp: Require a HDMI sink for YCbCr output via PCON
> drm/i915/dp: Validate sink format in .mode_valid()
> drm/i915/hdmi: Make the RGB fallback for "4:2:0 only" modes the last
> resort
> drm/i915/dp: Make the RGB fallback for "4:2:0 only" modes the last
> resort
>
> drivers/gpu/drm/i915/display/intel_dp.c | 250 +++++++++++++---------
> drivers/gpu/drm/i915/display/intel_hdmi.c | 167 +++++++++------
> 2 files changed, 254 insertions(+), 163 deletions(-)
>
>

For the whole series:

Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>

Tested both DisplayPort and HDMI on an N97 board, exercising various
output formats.