From: Oscar Mateo <oscar.ma...@intel.com>
Otherwise, we might receive a new interrupt before we have time to
ack the first one, eventually missing it.
Notice that, before clearing a port-sourced interrupt in the IIR, the
corresponding interrupt source status in the PORT_HOTPLUG_STAT must be
cleared.
Spotted by Bob Beckett <robert.beck...@intel.com>.
Signed-off-by: Oscar Mateo <oscar.ma...@intel.com>
---
drivers/gpu/drm/i915/i915_irq.c | 61 +++++++++++++++++++++++------------------
1 file changed, 35 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 4439e2d..9d381cc 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1813,26 +1813,28 @@ static void i9xx_hpd_irq_handler(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
- if (IS_G4X(dev)) {
- u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_G4X;
+ if (hotplug_status) {
+ I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
+ /*
+ * Make sure hotplug status is cleared before we clear IIR, or
else we
+ * may miss hotplug events.
+ */
+ POSTING_READ(PORT_HOTPLUG_STAT);
- intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_g4x);
- } else {
- u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
+ if (IS_G4X(dev)) {
+ u32 hotplug_trigger = hotplug_status &
HOTPLUG_INT_STATUS_G4X;
- intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
- }
+ intel_hpd_irq_handler(dev, hotplug_trigger,
hpd_status_g4x);
+ } else {
+ u32 hotplug_trigger = hotplug_status &
HOTPLUG_INT_STATUS_I915;
- if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) &&
- hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
- dp_aux_irq_handler(dev);
+ intel_hpd_irq_handler(dev, hotplug_trigger,
hpd_status_i915);
+ }
- I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
- /*
- * Make sure hotplug status is cleared before we clear IIR, or else we
- * may miss hotplug events.
- */
- POSTING_READ(PORT_HOTPLUG_STAT);
+ if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) &&
+ hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
+ dp_aux_irq_handler(dev);
+ }
}
static irqreturn_t valleyview_irq_handler(int irq, void *arg)
@@ -1843,29 +1845,36 @@ static irqreturn_t valleyview_irq_handler(int irq, void
*arg)
irqreturn_t ret = IRQ_NONE;
while (true) {
- iir = I915_READ(VLV_IIR);
gt_iir = I915_READ(GTIIR);
pm_iir = I915_READ(GEN6_PMIIR);
+ iir = I915_READ(VLV_IIR);
if (gt_iir == 0 && pm_iir == 0 && iir == 0)
goto out;
- ret = IRQ_HANDLED;
+ if (gt_iir)
+ I915_WRITE(GTIIR, gt_iir);
- snb_gt_irq_handler(dev, dev_priv, gt_iir);
+ if (pm_iir)
+ I915_WRITE(GEN6_PMIIR, pm_iir);
- valleyview_pipestat_irq_handler(dev, iir);
+ if (iir) {
+ /* Consume port. Then clear IIR or we'll miss events */
+ if (iir & I915_DISPLAY_PORT_INTERRUPT)
+ i9xx_hpd_irq_handler(dev);
+ I915_WRITE(VLV_IIR, 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;
+
+ if (gt_iir)
+ snb_gt_irq_handler(dev, dev_priv, gt_iir);
if (pm_iir)
gen6_rps_irq_handler(dev_priv, pm_iir);
- I915_WRITE(GTIIR, gt_iir);
- I915_WRITE(GEN6_PMIIR, pm_iir);
- I915_WRITE(VLV_IIR, iir);
+ if (iir)
+ valleyview_pipestat_irq_handler(dev, iir);
}
out:
--
1.9.0
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