drm/i915/fbc: only update no_fbc_reason when active
authorDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 11 Aug 2017 07:23:27 +0000 (09:23 +0200)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Fri, 11 Aug 2017 14:57:18 +0000 (16:57 +0200)
commit2ae9e3653f09121c224a1fbff617921d08b839ae
tree5ddd9e7afd460d59325533a56e9c7116cf1ab143
parent7ea1adf30f82a4c0910524ac06f8f1f26281bb23
drm/i915/fbc: only update no_fbc_reason when active

In our snb farm in CI we have plenty of underruns, but not enough
stolen memory to enable fbc. Which means every time there's an
underrun the no_fbc_reason swichtes to something that makes
kms_frontbuffer_tracking fail instead of skip, adding massive amounts
of additional noise to igt test runs.

Make sure we don't try to disable fbc when it's off already.

v2: Squash in additional WARN_ON suggestion from Chris.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170811072327.4335-1-daniel.vetter@ffwll.ch
drivers/gpu/drm/i915/intel_fbc.c