drm/i915: fold the no-irq check into intel_hpd_irq_handler

The usual pattern for our sub-function irq_handlers is that they check
for the no-irq case themselves. This results in more streamlined code
in the upper irq handlers.

v2: Rebase on top of the i965g/gm sdvo hpd fix.

Cc: Egbert Eich <eich@suse.de>
Reviewed-by: Egbert Eich <eich@suse.de>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -881,6 +881,9 @@ static inline void intel_hpd_irq_handler(struct drm_device *dev,
 	int i;
 	bool storm_detected = false;
 
+	if (!hotplug_trigger)
+		return;
+
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 
 	for (i = 1; i < HPD_NUM_PINS; i++) {
@@ -1018,9 +1021,9 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
 
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 					 hotplug_status);
-			if (hotplug_trigger) {
+
 			intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
-			}
+
 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 			I915_READ(PORT_HOTPLUG_STAT);
 		}
@@ -1046,9 +1049,8 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
 
-	if (hotplug_trigger) {
 	intel_hpd_irq_handler(dev, hotplug_trigger, hpd_ibx);
-	}
+
 	if (pch_iir & SDE_AUDIO_POWER_MASK) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
 			       SDE_AUDIO_POWER_SHIFT);
@@ -1149,9 +1151,8 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
 
-	if (hotplug_trigger) {
 	intel_hpd_irq_handler(dev, hotplug_trigger, hpd_cpt);
-	}
+
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
 			       SDE_AUDIO_POWER_SHIFT_CPT);
@@ -3225,9 +3226,9 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
 
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 				  hotplug_status);
-			if (hotplug_trigger) {
+
 			intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
-			}
+
 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 			POSTING_READ(PORT_HOTPLUG_STAT);
 		}
@@ -3463,10 +3464,10 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
 
 			DRM_DEBUG_DRIVER("hotplug event received, stat 0x%08x\n",
 				  hotplug_status);
-			if (hotplug_trigger) {
+
 			intel_hpd_irq_handler(dev, hotplug_trigger,
 					      IS_G4X(dev) ? hpd_status_gen4 : hpd_status_i915);
-			}
+
 			I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 			I915_READ(PORT_HOTPLUG_STAT);
 		}