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drm/i915: don't disable_fbc() if FBC is already disabled

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If FBC is disabled we will still call intel_fbc_invalidate(), and as a
result we may call intel_fbc_deactivate(), which will try to touch
registers.

I'm pretty sure I saw this happen on a runtime suspended device, and
I'm almost sure I was running igt/pm_rpm. It produced the "you touched
registers while the device is suspended" WARNs. But this was some time
ago and I can't remember exactly which conditions were necessary to
reproduce the problem.

v2: Rebase to new series order.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1446664257-32012-8-git-send-email-paulo.r.zanoni@intel.com
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
This commit is contained in:
Paulo Zanoni 2015-11-04 17:10:51 -02:00 • committed by Maarten Lankhorst
parent 548043abae
commit c68ae339e7
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/intel_fbc.c
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@ -438,7 +438,8 @@ static void __intel_fbc_disable(struct drm_i915_private *dev_priv)
intel_fbc_cancel_work(dev_priv);
dev_priv->fbc.disable_fbc(dev_priv);
if (dev_priv->fbc.enabled)
dev_priv->fbc.disable_fbc(dev_priv);
dev_priv->fbc.crtc = NULL;
}