drm/i915/hdmi: Clean up TMDS clock limit exceeding user mode handling

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Currently we just use all the hdmi_deep_color_possible() stuff
to compute whether deep color is possible, and leave the 8bpc
case to do its own thing. That doesn't mesh super well with 4:2:0
handling because we might end up going for 8bpc RGB without
considering that it's essentially illegal and we could instead
go for a legal 4:2:0 config.

So let's run through all the clock checks even for 8bpc first.
If we've fully exhausted all options only then do we re-run
the computation for 8bpc while ignoring the downstream TMDS
clock limits. This will guarantee that if there's a config
that respects all limits we will find it, and if there is not
we still allow the user to override the mode manually.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211015133921.4609-7-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

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This commit is contained in:

Ville Syrjälä 2021-10-15 16:39:07 +03:00

parent 428cb15d5b

commit b4d7757758

3 changed files with 62 additions and 47 deletions

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13

drivers/gpu/drm/i915/display/intel_dp.c

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92

drivers/gpu/drm/i915/display/intel_hdmi.c

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4

drivers/gpu/drm/i915/display/intel_hdmi.h

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