[PATCH 11/15] drm/i915: add INTEL_IRQ_REG_RESET16

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

Same thing as INTEL_IRQ_REG_RESET, but now on a separate patch, as
requested by Ben.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 9684f1e..7588ad3 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -79,6 +79,15 @@ static const u32 hpd_status_i915[] = { /* i915 and valleyview are the same */
 	[HPD_PORT_D] = PORTD_HOTPLUG_INT_STATUS
 };
 
+#define INTEL_IRQ_REG_RESET16(type, do_iir) do { \
+	I915_WRITE16(type##MR, 0xffff); \
+	I915_WRITE16(type##ER, 0); \
+	if (do_iir) \
+		I915_WRITE16(type##IR, I915_READ16(type##IR)); \
+	else \
+		POSTING_READ16(type##ER); \
+} while (0)
+
 #define INTEL_IRQ_REG_RESET(type) do { \
 	I915_WRITE(type##MR, 0xffffffff); \
 	I915_WRITE(type##ER, 0); \
@@ -2308,9 +2317,7 @@ static void i8xx_irq_preinstall(struct drm_device * dev)
 
 	for_each_pipe(pipe)
 		I915_WRITE(PIPESTAT(pipe), 0);
-	I915_WRITE16(IMR, 0xffff);
-	I915_WRITE16(IER, 0x0);
-	POSTING_READ16(IER);
+	INTEL_IRQ_REG_RESET16(I, false);
 }
 
 static int i8xx_irq_postinstall(struct drm_device *dev)
@@ -2448,9 +2455,7 @@ static void i8xx_irq_uninstall(struct drm_device * dev)
 		I915_WRITE(PIPESTAT(pipe), 0);
 		I915_WRITE(PIPESTAT(pipe), I915_READ(PIPESTAT(pipe)));
 	}
-	I915_WRITE16(IMR, 0xffff);
-	I915_WRITE16(IER, 0x0);
-	I915_WRITE16(IIR, I915_READ16(IIR));
+	INTEL_IRQ_REG_RESET16(I, true);
 }
 
 static void i915_irq_preinstall(struct drm_device * dev)
-- 
1.8.1.2