From: Paulo Zanoni Date: Thu, 17 Jul 2014 20:43:46 +0000 (-0300) Subject: d rm/i915: freeze display before the interrupts and GT X-Git-Tag: firefly_0821_release~176^2~3035^2~78^2~34 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=06ffc7789e76a095e85814dbcf7b660344f6b679;p=firefly-linux-kernel-4.4.55.git d rm/i915: freeze display before the interrupts and GT Since we started using intel_runtime_pm_disable_interrupts() at normal (non-runtime) suspend/resume, we had to remove a WARN from ironlake_disable_display_irq to avoid a case where we were doing the correct thing and the WARN was not really needed. The problem is that the WARN was useful in other cases, and its removal can hide some bugs that we would catch automatically. To be able to add back the WARN, we have to call intel_crtc_control() before interrupts are disabled, which is what this patch currently does. Also notice that Ville's patch from the Watermarks series "drm/i915: Leave interrupts enabled while disabling crtcs during suspend" also did a change that's equivalent to the one we're doing on this patch, with the exception that its original patch, when applied to the current tree, procduces a WARN. Related commits: commit daa390e5ee45cc051d6bf37b296901f2f92b002d Author: Jesse Barnes drm/i915: don't warn if IRQs are disabled when shutting down display IRQs commit e11aa362308f5de467ce355a2a2471321b15a35c Author: Jesse Barnes drm/i915: use runtime irq suspend/resume in freeze/thaw Note that the function part of this patch has already been done in commit 0e32b39ceed665bfa4a77a4bc307b6652b991632 Author: Dave Airlie Date: Fri May 2 14:02:48 2014 +1000 drm/i915: add DP 1.2 MST support (v0.7) with the fixup commit 09b64267c1f72f2670fcde9f11e5453ce365ca23 Author: Dave Airlie Date: Wed Jul 23 14:25:24 2014 +1000 drm/i915: don't suspend gt until after we disable irqs and display (v2) so all that's left from Paulo's patch is reinstating the WARNING. Cc: Ville Syrjälä Cc: Jesse Barnes Signed-off-by: Paulo Zanoni Reviewed-by: Jesse Barnes [danvet: Explain conflict resolution with Dave's DP MST patches with a note in the commit message.] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 0e44c433cfc3..379cfb5dc731 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -151,7 +151,7 @@ ironlake_disable_display_irq(struct drm_i915_private *dev_priv, u32 mask) { assert_spin_locked(&dev_priv->irq_lock); - if (!intel_irqs_enabled(dev_priv)) + if (WARN_ON(!intel_irqs_enabled(dev_priv))) return; if ((dev_priv->irq_mask & mask) != mask) {