[Intel-gfx] [PATCH 17/26] drm/i915: fix the CFB size check

[Paulo Zanoni]

In function find_compression_threshold() we try to over-allocate CFB
space in order to reudce reallocations and fragmentation, and we're
not considering that at the CFB size check. Consider it.

There is also a longer-term plan to kill
dev_priv->fbc.uncompressed_size, but this will come later.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/intel_fbc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 17f098d..29d61d1 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -743,7 +743,8 @@ static int intel_fbc_setup_cfb(struct intel_crtc *crtc)
 	size = intel_fbc_calculate_cfb_size(crtc);
 	cpp = drm_format_plane_cpp(fb->pixel_format, 0);
 
-	if (size <= dev_priv->fbc.uncompressed_size)
+	if (dev_priv->fbc.compressed_fb.allocated &&
+	    size <= dev_priv->fbc.compressed_fb.size * dev_priv->fbc.threshold)
 		return 0;
 
 	/* Release any current block */
-- 
2.6.1