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[1/6] drm/i915: make sure we're not changing the FBC CFB with FBC enabled

Message ID 1436389139-16282-2-git-send-email-przanoni@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Paulo Zanoni July 8, 2015, 8:58 p.m. UTC 
From: Paulo Zanoni <paulo.r.zanoni@intel.com>

We used to have this bug in the past, but now that we properly track
the size of the CFB, we don't have it anymore. Still, add the WARN
just to make sure we don't go back to the bad state.

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

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index c271af7..1448746 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -589,6 +589,8 @@  static int intel_fbc_alloc_cfb(struct drm_i915_private *dev_priv, int size,
 
 	dev_priv->fbc.threshold = ret;
 
+	WARN_ON(dev_priv->fbc.enabled);
+
 	if (INTEL_INFO(dev_priv)->gen >= 5)
 		I915_WRITE(ILK_DPFC_CB_BASE, dev_priv->fbc.compressed_fb.start);
 	else if (IS_GM45(dev_priv)) {