[Intel-gfx] [PATCH] drm/i915: Do not check or a stalled pageflip prior to it being queued

[Chris Wilson]

When we queue the command or operation to change the scanout address, we
mark the flip as in progress. We can use this flag to prevent us from
checking for a stalled flip prior to its existence!

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index aab8dfd1f8a5..edc7d4a7c9de 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11248,6 +11248,9 @@ static bool __intel_pageflip_stall_check(struct drm_device *dev,
 	if (atomic_read(&work->pending) >= INTEL_FLIP_COMPLETE)
 		return true;
 
+	if (atomic_read(&work->pending) < INTEL_FLIP_PENDING)
+		return false;
+
 	if (!work->enable_stall_check)
 		return false;
 
-- 
2.5.0