From: Paulo Zanoni <paulo.r.zanoni at intel.com>
So don't read it when capturing the error state. This solves
"unclaimed register" messages on Haswell when we have a GPU hang.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
drivers/gpu/drm/i915/i915_irq.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2139714..29b1bb1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1366,8 +1366,9 @@ static void i915_capture_error_state(struct drm_device *dev)
else if (INTEL_INFO(dev)->gen == 6)
error->forcewake = I915_READ(FORCEWAKE);
- for_each_pipe(pipe)
- error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
+ if (INTEL_INFO(dev)->gen <= 4)
+ for_each_pipe(pipe)
+ error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
if (INTEL_INFO(dev)->gen >= 6) {
error->error = I915_READ(ERROR_GEN6);
--
1.7.10.4
