drm/i915/chv: Make CHV irq handler loop until all interrupts are consumed

Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: NAntti Koskipää <antti.koskipaa@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -1787,11 +1787,12 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
 	u32 master_ctl, iir;
 	irqreturn_t ret = IRQ_NONE;
 
-	master_ctl = I915_READ(GEN8_MASTER_IRQ) & ~DE_MASTER_IRQ_CONTROL;
+	for (;;) {
+		master_ctl = I915_READ(GEN8_MASTER_IRQ) & ~GEN8_MASTER_IRQ_CONTROL;
 		iir = I915_READ(VLV_IIR);
 
 		if (master_ctl == 0 && iir == 0)
-		return IRQ_NONE;
+			break;
 
 		I915_WRITE(GEN8_MASTER_IRQ, 0);
 
@@ -1800,10 +1801,7 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
 		valleyview_pipestat_irq_handler(dev, iir);
 
 		/* Consume port.  Then clear IIR or we'll miss events */
-	if (iir & I915_DISPLAY_PORT_INTERRUPT) {
 		i9xx_hpd_irq_handler(dev);
-		ret = IRQ_HANDLED;
-	}
 
 		I915_WRITE(VLV_IIR, iir);
 
@@ -1811,6 +1809,7 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg)
 		POSTING_READ(GEN8_MASTER_IRQ);
 
 		ret = IRQ_HANDLED;
+	}
 
 	return ret;
 }