[Intel-gfx] [PATCH stable-5.10] drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4

[Greg KH]

On Mon, Jan 25, 2021 at 03:27:11PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> commit 1c4995b0a576d24bb7ead991fb037c8b47ab6e32 upstream.
> 
> Let's not enable the 4:4:4->4:2:0 conversion bit in the DFP unless we're
> actually outputting YCbCr 4:4:4. It would appear some protocol
> converters blindy consult this bit even when the source is outputting
> RGB, resulting in a visual mess.
> 
> Cc: <stable at vger.kernel.org> # 0e634efd858e: drm/i915: s/intel_dp_sink_dpms/intel_dp_set_power/
> Cc: stable at vger.kernel.org
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2914
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20210111164111.13302-1-ville.syrjala@linux.intel.com
> Fixes: 181567aa9f0d ("drm/i915: Do YCbCr 444->420 conversion via DP protocol converters")
> Reviewed-by: Jani Nikula <jani.nikula at intel.com>
> (cherry picked from commit 3170a21f7059c4660c469f59bf529f372a57da5f)
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> Link: https://patchwork.freedesktop.org/patch/msgid/20210118154355.24453-1-ville.syrjala@linux.intel.com
> (cherry picked from commit 1c4995b0a576d24bb7ead991fb037c8b47ab6e32)
> ---
> Note the extra depdendency on commit 0e634efd858e
> ("drm/i915: s/intel_dp_sink_dpms/intel_dp_set_power/").

Thanks for this, now queued up.

greg k-h