[Intel-gfx] [PATCH 1/2] SNB (and IVB too I suppose) starts to misbehave if the GPU gets stuck in an infinite batch buffer loop. The GPU apparently hogs something critical and CPUs start to lose interrupts and whatnot. We can keep the system limping along by unmasking some interrupts in GEN6_PMINTRMSK. The EI up interrupt has been previously chosen for that task, so let's never mask it.

[Sagar Arun Kamble]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

v2: s/gen6_rps_pm_mask/gen6_sanitize_rps_pm_mask/ (Chris)

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_pm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index adb6463..aee56ae 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4715,7 +4715,7 @@ void gen6_rps_idle(struct drm_i915_private *dev_priv)
 		else
 			gen6_set_rps(dev_priv, dev_priv->rps.idle_freq);
 		dev_priv->rps.last_adj = 0;
-		I915_WRITE(GEN6_PMINTRMSK, 0xffffffff);
+		I915_WRITE(GEN6_PMINTRMSK, gen6_sanitize_rps_pm_mask(dev_priv, ~0));
 	}
 	mutex_unlock(&dev_priv->rps.hw_lock);
 
-- 
1.9.1