tests/kms_pwrite_crc: Use drmModeSetPlane() instead of igt_plane_set_fb()
igt_plane_set_fb()+igt_display_commit() have too much overhead, and that
causes the cache to get flushed before we flip, making the test
useless, at least on machines with small LLC. Switch to
drmModeSetPlane() to reduce the chance that the cache gets flushed
before we grab the crc.
Still nowhere near 100% reliable on my IVB laptop with 3 MiB LLC,
but at least it can now hit the problem occasioanally. My desktop
IVB with 8 MiB LLC seems to hit it rather reliably.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
1 file changed