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

Sonika Jindal
2015-07-07T09:02:31Z

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.jindal@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