[Intel-gfx] [PATCH] drm/i915: Handle HPD when it has actually occurred

[Sonika Jindal]

Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
Handle it only if hpd has actually occurred like we handle other
interrupts.
v2: Make few variables local to if block (Ville)

Signed-off-by: Sonika Jindal <sonika.jindal at intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a6fbe64..cd504dc 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
-	u32 dig_hotplug_reg;
-	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+	if (hotplug_trigger) {
+		u32 dig_hotplug_reg, pin_mask, long_mask;
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+						dig_hotplug_reg, hpd_cpt);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
-- 
1.7.10.4