Michel Dänzer authored Jul 27, 2018 and Michel Dänzer committed Jul 27, 2018

We were only storing the FB provided by the client, but on CRTCs with
TearFree enabled, we use a separate FB. This could cause
drmmode_flip_handler to fail to clear drmmode_crtc->flip_pending, which
could result in a hang when waiting for the pending flip to complete. We
were trying to avoid that by always clearing drmmode_crtc->flip_pending
when TearFree is enabled, but that wasn't reliable, because
drmmode_crtc->tear_free can already be FALSE at this point when
disabling TearFree.

Now that we're keeping track of each CRTC's flip FB separately,
drmmode_flip_handler can reliably clear flip_pending, and we no longer
need the TearFree hack.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>