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[intel] Use IMR instead of IER to pend interrupts during ISR 

Noting that the interrupt mask register was more reliable than the interrupt
enable register for managing interrupts in user_irq_on/user_irq_off, this
patch replaces the remaining IER frobbing with IMR instead.

The test which exposes IER related failures is:

$ glxgears & glxgears & glxgears
(reposition the glxgears windows away from the upper left corner)
$ while :; do x11perf -rect100 -reps 800 -repeat 1; sleep 1; done &
$ while :; do runoa; runet; done &
main
Keith Packard 2008-06-21 00:33:07 -07:00
parent 8be6ec491f
commit a369bf0e57
1 changed files with 10 additions and 7 deletions
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17
shared-core/i915_irq.c
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@ -451,7 +451,7 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
int vblank = 0;
if (dev->pdev->msi_enabled)
I915_WRITE(I915REG_INT_ENABLE_R, 0);
I915_WRITE(I915REG_INT_MASK_R, ~0);
iir = I915_READ(I915REG_INT_IDENTITY_R);
#if 0
DRM_DEBUG("flag=%08x\n", iir);
@ -464,9 +464,11 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
I915_READ(I915REG_INT_ENABLE_R),
I915_READ(I915REG_PIPEASTAT),
I915_READ(I915REG_PIPEBSTAT));
if (dev->pdev->msi_enabled)
I915_WRITE(I915REG_INT_ENABLE_R,
I915_INTERRUPT_ENABLE_MASK);
if (dev->pdev->msi_enabled) {
I915_WRITE(I915REG_INT_MASK_R,
dev_priv->irq_mask_reg);
(void) I915_READ(I915REG_INT_MASK_R);
}
return IRQ_NONE;
}
@ -484,6 +486,8 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
}
I915_WRITE(I915REG_INT_IDENTITY_R, iir);
if (dev->pdev->msi_enabled)
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
(void) I915_READ(I915REG_INT_IDENTITY_R); /* Flush posted writes */
if (dev_priv->sarea_priv)
@ -512,8 +516,6 @@ irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
drm_locked_tasklet(dev, i915_vblank_tasklet);
}
if (dev->pdev->msi_enabled)
I915_WRITE(I915REG_INT_ENABLE_R, I915_INTERRUPT_ENABLE_MASK);
return IRQ_HANDLED;
}
@ -543,6 +545,7 @@ void i915_user_irq_on(drm_i915_private_t *dev_priv)
if ((dev_priv->irq_mask_reg & I915_USER_INTERRUPT) != 0) {
dev_priv->irq_mask_reg &= ~I915_USER_INTERRUPT;
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
I915_WRITE(I915REG_INT_IDENTITY_R, I915_USER_INTERRUPT);
(void) I915_READ (I915REG_INT_MASK_R);
}
}
@ -740,7 +743,7 @@ static void i915_enable_interrupt (struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
dev_priv->irq_mask_reg = I915_INTERRUPT_ENABLE_MASK;
dev_priv->irq_mask_reg = ~0;
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
I915_WRITE(I915REG_INT_ENABLE_R, I915_INTERRUPT_ENABLE_MASK);
(void) I915_READ (I915REG_INT_ENABLE_R);