[Intel-gfx] [PATCH 2/9] drm/i915: fix the FBC CFB size tracking

[Chris Wilson]

On Tue, Dec 23, 2014 at 10:35:38AM -0200, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> We have dev_priv->fbc.size which is supposed to contain the compressed
> FB size, but it is not: at find_compression_threshold() we try to
> overallocate the CFB, but we don't consider this when we assign a
> value to dev_priv->fbc.size. Since the correct CFB size should already
> be stored at dev_priv->fbc.compressed_fb.size, just kill
> dev_priv->fbc.size and use the correct value isntead.

They should not be equivalent though. We actually want fbc.size to
compensate for the compression in the allocation so that the simple
check for enough space succeeds even if we are compressing.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre