From: Daniel Vetter Date: Thu, 4 Jul 2013 21:35:26 +0000 (+0200) Subject: drm/i915: streamline hsw_pm_irq_handler X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=41a05a3a5cdc5d731014588b9a24759af1804d48;p=linux-beck.git drm/i915: streamline hsw_pm_irq_handler The if (pm_iir & ~GEN6_PM_RPS_EVENTS) check was redunandant. Otoh adding a check for rps events allows us to avoid the spinlock grabbing for VECS interrupts. v2: Drop misplaced hunk which now moved to the right patch. Reviewed-by: Ben Widawsky Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index a7c0a730a6e1..d4af11541287 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -963,25 +963,23 @@ static void dp_aux_irq_handler(struct drm_device *dev) static void hsw_pm_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir) { - spin_lock(&dev_priv->rps.lock); - dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS; - if (dev_priv->rps.pm_iir) { + if (pm_iir & GEN6_PM_RPS_EVENTS) { + spin_lock(&dev_priv->rps.lock); + dev_priv->rps.pm_iir |= pm_iir & GEN6_PM_RPS_EVENTS; 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_RPS_EVENTS); /* TODO: if queue_work is slow, move it out of the spinlock */ queue_work(dev_priv->wq, &dev_priv->rps.work); + spin_unlock(&dev_priv->rps.lock); } - spin_unlock(&dev_priv->rps.lock); - if (pm_iir & ~GEN6_PM_RPS_EVENTS) { - if (pm_iir & PM_VEBOX_USER_INTERRUPT) - notify_ring(dev_priv->dev, &dev_priv->ring[VECS]); + if (pm_iir & PM_VEBOX_USER_INTERRUPT) + notify_ring(dev_priv->dev, &dev_priv->ring[VECS]); - if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) { - DRM_ERROR("VEBOX CS error interrupt 0x%08x\n", pm_iir); - i915_handle_error(dev_priv->dev, false); - } + if (pm_iir & PM_VEBOX_CS_ERROR_INTERRUPT) { + DRM_ERROR("VEBOX CS error interrupt 0x%08x\n", pm_iir); + i915_handle_error(dev_priv->dev, false); } }