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drm/i915: Create a more generic pm handler for hsw+

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HSW has some special requirements for the VEBOX. Splitting out the
interrupt handler will make the code a bit nicer and less error prone
when we begin to handle those.

The slight functional change in this patch (queueing work while holding
the spinlock) is intentional as it makes a subsequent patch a bit nicer.
The change should also only effect HSW platforms.

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-05-28 19:22:24 -07:00 committed by Daniel Vetter
parent 861f3389c6
commit baf02a1fb0
1 changed files with 29 additions and 1 deletions
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30
drivers/gpu/drm/i915/i915_irq.c
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@ -842,6 +842,7 @@ static void snb_gt_irq_handler(struct drm_device *dev,
ivybridge_handle_parity_error(dev);
}
/* Legacy way of handling PM interrupts */
static void gen6_queue_rps_work(struct drm_i915_private *dev_priv,
u32 pm_iir)
{
@ -921,6 +922,31 @@ static void dp_aux_irq_handler(struct drm_device *dev)
wake_up_all(&dev_priv->gmbus_wait_queue);
}
/* Unlike gen6_queue_rps_work() from which this function is originally derived,
* we must be able to deal with other PM interrupts. This is complicated because
* of the way in which we use the masks to defer the RPS work (which for
* posterity is necessary because of forcewake).
*/
static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv,
u32 pm_iir)
{
unsigned long flags;
spin_lock_irqsave(&dev_priv->rps.lock, flags);
dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_DEFERRED_EVENTS;
if (dev_priv->rps.pm_iir) {
I915_WRITE(GEN6_PMIMR, dev_priv->rps.pm_iir);
/* never want to mask useful interrupts. (also posting read) */
WARN_ON(I915_READ_NOTRACE(GEN6_PMIMR) & ~GEN6_PM_DEFERRED_EVENTS);
/* TODO: if queue_work is slow, move it out of the spinlock */
queue_work(dev_priv->wq, &dev_priv->rps.work);
}
spin_unlock_irqrestore(&dev_priv->rps.lock, flags);
if (pm_iir & ~GEN6_PM_DEFERRED_EVENTS)
DRM_ERROR("Unexpected PM interrupted\n");
}
static irqreturn_t valleyview_irq_handler(int irq, void *arg)
{
struct drm_device *dev = (struct drm_device *) arg;
@ -1231,7 +1257,9 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
pm_iir = I915_READ(GEN6_PMIIR);
if (pm_iir) {
if (pm_iir & GEN6_PM_DEFERRED_EVENTS)
if (IS_HASWELL(dev))
hsw_pm_irq_handler(dev_priv, pm_iir);
else if (pm_iir & GEN6_PM_DEFERRED_EVENTS)
gen6_queue_rps_work(dev_priv, pm_iir);
I915_WRITE(GEN6_PMIIR, pm_iir);
ret = IRQ_HANDLED;