This has proven sufficient to recover from a hang of the GPU using the
gem_bad_blit test while at the KMS console then starting X. When
attempting the same during an X session, the timer doesn't appear to
trigger.
Signed-off-by: Eric Anholt <e...@anholt.net>
---
drivers/gpu/drm/i915/i915_drv.c | 11 +++++++++++
drivers/gpu/drm/i915/i915_reg.h | 6 ++++++
2 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index af2de29..6fa0a5a 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -404,6 +404,14 @@ static int ironlake_do_reset(struct drm_device *dev, u8
flags)
return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
}
+static int gen6_do_reset(struct drm_device *dev, u8 flags)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ I915_WRITE(GEN6_GDRST, GEN6_GRDOM_FULL);
+ return wait_for((I915_READ(GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
+}
+
/**
* i965_reset - reset chip after a hang
* @dev: drm device to reset
@@ -438,6 +446,9 @@ int i915_reset(struct drm_device *dev, u8 flags)
if (get_seconds() - dev_priv->last_gpu_reset < 5) {
DRM_ERROR("GPU hanging too fast, declaring wedged!\n");
} else switch (INTEL_INFO(dev)->gen) {
+ case 6:
+ ret = gen6_do_reset(dev, flags);
+ break;
case 5:
ret = ironlake_do_reset(dev, flags);
break;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 00351a6..01b4998 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -78,6 +78,12 @@
#define GRDOM_RENDER (1<<2)
#define GRDOM_MEDIA (3<<2)
+#define GEN6_GDRST 0x941c
+#define GEN6_GRDOM_FULL (1 << 0)
+#define GEN6_GRDOM_RENDER (1 << 1)
+#define GEN6_GRDOM_MEDIA (1 << 2)
+#define GEN6_GRDOM_BLT (1 << 3)
+
/* VGA stuff */
#define VGA_ST01_MDA 0x3ba
--
1.7.2.3
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