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clear interrupt status before install irq

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On my 865G machine, it seems the CPU will receive interrupt before
irq_postinstall is called. This will cause kernel oops because vblank is not
inited at that time. Clear interrupt status before install seems fixing this
problem.

Signed-off-by: Hong Liu <hong.liu@intel.com>
This commit is contained in:
Hong Liu 2008-04-18 16:49:23 +08:00 • committed by Jesse Barnes
parent c250104c8f
commit 8a390e058f
1 changed files with 11 additions and 0 deletions
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11
shared-core/i915_irq.c
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@ -1217,14 +1217,25 @@ int i915_vblank_swap(struct drm_device *dev, void *data,
void i915_driver_irq_preinstall(struct drm_device * dev)
{
struct drm_i915_private *dev_priv = (struct drm_i915_private *) dev->dev_private;
u32 tmp;
tmp = I915_READ(I915REG_PIPEASTAT);
I915_WRITE(I915REG_PIPEASTAT, tmp);
tmp = I915_READ(I915REG_PIPEBSTAT);
I915_WRITE(I915REG_PIPEBSTAT, tmp);
I915_WRITE16(I915REG_HWSTAM, 0xeffe);
if (IS_I9XX(dev) && !IS_I915G(dev) && !IS_I915GM(dev)) {
I915_WRITE(I915REG_INT_MASK_R, 0x0);
I915_WRITE(I915REG_INT_ENABLE_R, 0x0);
tmp = I915_READ(I915REG_INT_IDENTITY_R);
I915_WRITE(I915REG_INT_IDENTITY_R, tmp);
} else {
I915_WRITE16(I915REG_INT_MASK_R, 0x0);
I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
tmp = I915_READ16(I915REG_INT_IDENTITY_R);
I915_WRITE16(I915REG_INT_IDENTITY_R, tmp);
}
}