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.
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_fbc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 860b8c26d29b..4015b1e716e5 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -1216,7 +1216,7 @@ static void intel_fbc_underrun_work_fn(struct work_struct *work)
mutex_lock(&fbc->lock);
/* Maybe we were scheduled twice. */
- if (fbc->underrun_detected)
+ if (fbc->underrun_detected || !fbc->enabled)
goto out;
DRM_DEBUG_KMS("Disabling FBC due to FIFO underrun.\n");
--
2.13.3
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