diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 29215b6d5650..2f7f7cb0bf30 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1373,6 +1373,21 @@ void i915_hangcheck_elapsed(unsigned long data) dev_priv->last_instdone1 == instdone1) { if (dev_priv->hangcheck_count++ > 1) { DRM_ERROR("Hangcheck timer elapsed... GPU hung\n"); + + if (!IS_GEN2(dev)) { + /* Is the chip hanging on a WAIT_FOR_EVENT? + * If so we can simply poke the RB_WAIT bit + * and break the hang. This should work on + * all but the second generation chipsets. + */ + u32 tmp = I915_READ(PRB0_CTL); + if (tmp & RING_WAIT) { + I915_WRITE(PRB0_CTL, tmp); + POSTING_READ(PRB0_CTL); + goto out; + } + } + i915_handle_error(dev, true); return; } @@ -1384,6 +1399,7 @@ void i915_hangcheck_elapsed(unsigned long data) dev_priv->last_instdone1 = instdone1; } +out: /* Reset timer case chip hangs without another request being added */ mod_timer(&dev_priv->hangcheck_timer, jiffies + DRM_I915_HANGCHECK_PERIOD); }