From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
I did some brief tests and the "new_val = pmimr" condition usually
happens a few times after exiting games.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a00fe05..a1255da 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -142,14 +142,18 @@ static void snb_update_pm_irq(struct drm_i915_private *dev_priv,
uint32_t interrupt_mask,
uint32_t enabled_irq_mask)
{
- uint32_t pmimr = I915_READ(GEN6_PMIMR);
- pmimr &= ~interrupt_mask;
- pmimr |= (~enabled_irq_mask & interrupt_mask);
+ uint32_t pmimr, new_val;
assert_spin_locked(&dev_priv->irq_lock);
- I915_WRITE(GEN6_PMIMR, pmimr);
- POSTING_READ(GEN6_PMIMR);
+ pmimr = new_val = I915_READ(GEN6_PMIMR);
+ new_val &= ~interrupt_mask;
+ new_val |= (~enabled_irq_mask & interrupt_mask);
+
+ if (new_val != pmimr) {
+ I915_WRITE(GEN6_PMIMR, new_val);
+ POSTING_READ(GEN6_PMIMR);
+ }
}
void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
--
1.8.1.2
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