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drm/i915: Avoid reading fbc registers in vain when fbc was never enabled.

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If it wasn't never enabled by kernel parameter or platform default
we can avoid reading registers so many times in vain

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Rodrigo Vivi 2014-09-17 16:59:20 -04:00 committed by Daniel Vetter
parent 01d06e9f96
commit 342e36c6b0
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/intel_pm.c
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@ -339,6 +339,12 @@ bool intel_fbc_enabled(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
/* If it wasn't never enabled by kernel parameter or platform default
* we can avoid reading registers so many times in vain
*/
if (!i915.enable_fbc)
return false;
if (!dev_priv->display.fbc_enabled)
return false;