[PATCH] drm/i915/display: Disable AuxCCS framebuffers if built for Xe

[Tvrtko Ursulin]

Hi,

On 05/03/2024 16:44, Jani Nikula wrote:
> On Wed, 28 Feb 2024, Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com> wrote:
>> AuxCCS framebuffers don't work on Xe driver hence disable them
>> from plane capabilities until they are fixed. FlatCCS framebuffers
>> work and they are left enabled. CCS is left untouched for i915
>> driver.

I couldn't find the answer in the below linked issue or in the thread - 
is it known what exactly is missing/broken to make this work and are 
there any plans to do it? Or perhaps not if gen12lp is not intended to 
be supported?

Thanks,

Tvrtko

>> Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/933
>> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
> 
> Acked-by: Jani Nikula <jani.nikula at intel.com>
> 
> 
>> ---
>>   drivers/gpu/drm/i915/display/skl_universal_plane.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c b/drivers/gpu/drm/i915/display/skl_universal_plane.c
>> index e941e2e4fd14..860574d04f88 100644
>> --- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
>> +++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
>> @@ -2295,6 +2295,9 @@ static u8 skl_get_plane_caps(struct drm_i915_private *i915,
>>   	if (HAS_4TILE(i915))
>>   		caps |= INTEL_PLANE_CAP_TILING_4;
>>   
>> +	if (!IS_ENABLED(I915) && !HAS_FLAT_CCS(i915))
>> +		return caps;
>> +
>>   	if (skl_plane_has_rc_ccs(i915, pipe, plane_id)) {
>>   		caps |= INTEL_PLANE_CAP_CCS_RC;
>>   		if (DISPLAY_VER(i915) >= 12)
>