[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)
v3: Add check for ibx/cpt both (Ville).
    While at it, remove the redundant check for hotplug_trigger from
    pch_get_hpd_pins

Signed-off-by: Sonika Jindal <sonika.jin...@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a6fbe64..ba2c27c 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 
*long_mask,
        *pin_mask = 0;
        *long_mask = 0;
 
-       if (!hotplug_trigger)
-               return;
-
        for_each_hpd_pin(i) {
                if ((hpd[i] & hotplug_trigger) == 0)
                        continue;
@@ -1658,14 +1655,17 @@ static void ibx_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;
-       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_ibx);
-       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_ibx);
+               intel_hpd_irq_handler(dev, pin_mask, long_mask);
+       }
 
        if (pch_iir & SDE_AUDIO_POWER_MASK) {
                int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
@@ -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

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