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drm/i915: Fix IRQ stall issue on Ironlake

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The master irq control in DE must be disabled before irq handling,
and enable after the process. This fixes the irq stall issue on
Ironlake.

Cc: Stable Team <stable@kernel.org>
Signed-off-by: Zou, Nanhai <nanhai.zou@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Zou, Nanhai 2009-11-06 02:13:01 +00:00 committed by Eric Anholt
parent d8a2d0e00c
commit 2d109a845d
1 changed files with 9 additions and 1 deletions
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10
drivers/gpu/drm/i915/i915_irq.c
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@ -254,10 +254,15 @@ irqreturn_t igdng_irq_handler(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret = IRQ_NONE;
u32 de_iir, gt_iir;
u32 de_iir, gt_iir, de_ier;
u32 new_de_iir, new_gt_iir;
struct drm_i915_master_private *master_priv;
/* disable master interrupt before clearing iir */
de_ier = I915_READ(DEIER);
I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
(void)I915_READ(DEIER);
de_iir = I915_READ(DEIIR);
gt_iir = I915_READ(GTIIR);
@ -290,6 +295,9 @@ irqreturn_t igdng_irq_handler(struct drm_device *dev)
gt_iir = new_gt_iir;
}
I915_WRITE(DEIER, de_ier);
(void)I915_READ(DEIER);
return ret;
}