On 21/09/16 07:30 PM, Christian König wrote:
> Am 21.09.2016 um 11:56 schrieb Michel Dänzer:
>> FWIW, we seem to have the same issue with radeon vs. amdgpu: radeon only
>> seems to wait for exclusive fences, so e.g. running Xorg on amdgpu and
>> using PRIME slave scanout on radeon leaves artifacts.
> Yeah, I know. See radeon_display.c radeon_flip_work_func().
> We pretty much need the same patch here I've done for amdgpu as well.

Actually, the PRIME slave can't scan out from the shared BOs directly
(recall the recent discussion we had about that with Mario), but has to
copy from the shared BO to a dedicated scanout BO. These copies need to
be synchronized with the primary GPU's copies to the shared BO.

Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
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