From: Paulo Zanoni <paulo.r.zan...@intel.com>
This is bad news and shouldn't be happening.
Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
---
drivers/gpu/drm/i915/i915_irq.c | 29 +++++++++++++++++++++++++----
drivers/gpu/drm/i915/i915_reg.h | 4 ++++
2 files changed, 29 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 500fd65..10aec0e 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -665,6 +665,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32
pch_iir)
DRM_DEBUG_DRIVER("PCH transcoder A underrun interrupt\n");
}
+static void serr_int_handler(struct drm_device *dev)
+{
+ drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+ u32 serr_int = I915_READ(SERR_INT);
+
+ if (serr_int & SERR_INT_POISON)
+ DRM_ERROR("PCH poison interrupt\n");
+
+ I915_WRITE(SERR_INT, serr_int);
+}
+
static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
@@ -695,6 +706,9 @@ static void cpt_irq_handler(struct drm_device *dev, u32
pch_iir)
DRM_DEBUG_DRIVER(" pipe %c FDI IIR: 0x%08x\n",
pipe_name(pipe),
I915_READ(FDI_RX_IIR(pipe)));
+
+ if (pch_iir & SDE_ERROR_CPT)
+ serr_int_handler(dev);
}
static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
@@ -1943,14 +1957,19 @@ static void ibx_irq_postinstall(struct drm_device *dev)
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 mask;
- if (HAS_PCH_IBX(dev))
+ if (HAS_PCH_IBX(dev)) {
mask = SDE_HOTPLUG_MASK |
SDE_GMBUS |
- SDE_AUX_MASK;
- else
+ SDE_AUX_MASK |
+ SDE_POISON;
+ } else {
mask = SDE_HOTPLUG_MASK_CPT |
SDE_GMBUS_CPT |
- SDE_AUX_MASK_CPT;
+ SDE_AUX_MASK_CPT |
+ SDE_ERROR_CPT;
+
+ I915_WRITE(SERR_INT, I915_READ(SERR_INT));
+ }
I915_WRITE(SDEIIR, I915_READ(SDEIIR));
I915_WRITE(SDEIMR, ~mask);
@@ -2180,6 +2199,8 @@ static void ironlake_irq_uninstall(struct drm_device *dev)
I915_WRITE(SDEIMR, 0xffffffff);
I915_WRITE(SDEIER, 0x0);
I915_WRITE(SDEIIR, I915_READ(SDEIIR));
+ if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
+ I915_WRITE(SERR_INT, I915_READ(SERR_INT));
}
static void i8xx_irq_preinstall(struct drm_device * dev)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 663b5c1..9cd59f7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3528,6 +3528,7 @@
SDE_PORTC_HOTPLUG_CPT | \
SDE_PORTB_HOTPLUG_CPT)
#define SDE_GMBUS_CPT (1 << 17)
+#define SDE_ERROR_CPT (1 << 16)
#define SDE_AUDIO_CP_REQ_C_CPT (1 << 10)
#define SDE_AUDIO_CP_CHG_C_CPT (1 << 9)
#define SDE_FDI_RXC_CPT (1 << 8)
@@ -3552,6 +3553,9 @@
#define SDEIIR 0xc4008
#define SDEIER 0xc400c
+#define SERR_INT 0xc4040
+#define SERR_INT_POISON (1 << 31)
+
/* digital port hotplug */
#define PCH_PORT_HOTPLUG 0xc4030 /* SHOTPLUG_CTL */
#define PORTD_HOTPLUG_ENABLE (1 << 20)
--
1.7.10.4
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