static int i830_wait_irq(drm_device_t *dev, int irq_nr)
{
drm_i830_private_t *dev_priv =
(drm_i830_private_t *)dev->dev_private;
DECLARE_WAITQUEUE(entry, current);
unsigned long end = jiffies + HZ*3;
int ret = 0;
DRM_DEBUG("%s\n", __FUNCTION__);
if (atomic_read(&dev_priv->irq_received) >= irq_nr)
return 0;
dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
add_wait_queue(&dev_priv->irq_queue, &entry);
for (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if (atomic_read(&dev_priv->irq_received) >= irq_nr)
break;
if((signed)(end - jiffies) <= 0) {
DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
I830_READ16( I830REG_INT_IDENTITY_R ),
I830_READ16( I830REG_INT_MASK_R ),
I830_READ16( I830REG_INT_ENABLE_R ),
I830_READ16( I830REG_HWSTAM ));
ret = -EBUSY; /* Lockup? Missed irq? */
break;
}
schedule_timeout(HZ*3);
if (signal_pending(current)) {
ret = -EINTR;
break;
}
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&dev_priv->irq_queue, &entry);
return ret;
}
irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS)
{
struct drm_device *dev = (struct drm_device *) arg;
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
u16 temp;
temp = I830_READ16(I830REG_INT_IDENTITY_R);
DRM_DEBUG("%x\n", temp);
if (!(temp & 2))
return IRQ_NONE;
I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
atomic_inc(&dev_priv->irq_received);
wake_up_interruptible(&dev_priv->irq_queue);
return IRQ_HANDLED;
}