[Intel-gfx] [PATCH 2/3] drm/i915: Fix overlay frontbuffer tracking

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

We don't have a persistent fb holding a reference to the frontbuffer
object, so every time we do the get+put we throw the frontbuffer object
immediately away. And so the next time around we get a pristine
frontbuffer object with bits==0 even for the old vma. This confuses
the frontbuffer tracking code which understandably expects the old
frontbuffer to have the overlay's bit set.

Fix this by hanging on to the frontbuffer reference until the next
flip. And just to make this a bit more clear let's track the frontbuffer
explicitly instead of just grabbing it via the old vma.

Cc: stable at vger.kernel.org
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/1136
Fixes: da42104f589d ("drm/i915: Hold reference to intel_frontbuffer as we track activity")
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_overlay.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c
index 9c0113f15b58..ef8f44f5e751 100644
--- a/drivers/gpu/drm/i915/display/intel_overlay.c
+++ b/drivers/gpu/drm/i915/display/intel_overlay.c
@@ -183,6 +183,7 @@ struct intel_overlay {
 	struct intel_crtc *crtc;
 	struct i915_vma *vma;
 	struct i915_vma *old_vma;
+	struct intel_frontbuffer *frontbuffer;
 	bool active;
 	bool pfit_active;
 	u32 pfit_vscale_ratio; /* shifted-point number, (1<<12) == 1.0 */
@@ -283,21 +284,19 @@ static void intel_overlay_flip_prepare(struct intel_overlay *overlay,
 				       struct i915_vma *vma)
 {
 	enum pipe pipe = overlay->crtc->pipe;
-	struct intel_frontbuffer *from = NULL, *to = NULL;
+	struct intel_frontbuffer *frontbuffer = NULL;
 
 	drm_WARN_ON(&overlay->i915->drm, overlay->old_vma);
 
-	if (overlay->vma)
-		from = intel_frontbuffer_get(overlay->vma->obj);
 	if (vma)
-		to = intel_frontbuffer_get(vma->obj);
+		frontbuffer = intel_frontbuffer_get(vma->obj);
 
-	intel_frontbuffer_track(from, to, INTEL_FRONTBUFFER_OVERLAY(pipe));
+	intel_frontbuffer_track(overlay->frontbuffer, frontbuffer,
+				INTEL_FRONTBUFFER_OVERLAY(pipe));
 
-	if (to)
-		intel_frontbuffer_put(to);
-	if (from)
-		intel_frontbuffer_put(from);
+	if (overlay->frontbuffer)
+		intel_frontbuffer_put(overlay->frontbuffer);
+	overlay->frontbuffer = frontbuffer;
 
 	intel_frontbuffer_flip_prepare(overlay->i915,
 				       INTEL_FRONTBUFFER_OVERLAY(pipe));
-- 
2.26.2