[Intel-gfx] [PATCH 1/9] drm/i915: don't reallocate the compressed FB at every frame

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

With the current code we just reallocate the compressed FB at every
FBC update: we have X in one frame, then in the other frame we need X
again, but we check "needed < have" instead of "needed <= have".

There are still other problems with this code: we don't take the
threshold into consideration and we also have cases where we
reallocate the CFB while FBC is enabled, but let's leave these for
later patches.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_stolen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index a204584..4797138 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -253,7 +253,7 @@ int i915_gem_stolen_setup_compression(struct drm_device *dev, int size, int fb_c
 	if (!drm_mm_initialized(&dev_priv->mm.stolen))
 		return -ENODEV;
 
-	if (size < dev_priv->fbc.size)
+	if (size <= dev_priv->fbc.size)
 		return 0;
 
 	/* Release any current block */
-- 
2.1.3