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drm/i915: kicking rings stuck on semaphores considered harmful

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If our semaphore logic gets confused and we have a ring stuck waiting
for one, there's a decent chance it'll just execute garbage when being
kicked. Also, kicking the ring obscures the place where the error
first occured, making error_state decoding much harder.

So drop this an let gpu reset handle this mess in a clean fashion.

In contrast, kicking rings stuck on MI_WAIT is rather harmless, at
worst there'll be a bit of screen-flickering. There's also old
broken userspace out there which needs this as a  work-around.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Chris Wilson <chris@hchris-wilson.co.uk>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Daniel Vetter 2011-12-14 13:56:58 +01:00 committed by Keith Packard
parent ae662d3126
commit 4e0e90dcb8
1 changed files with 0 additions and 7 deletions
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7
drivers/gpu/drm/i915/i915_irq.c
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@ -1649,13 +1649,6 @@ static bool kick_ring(struct intel_ring_buffer *ring)
I915_WRITE_CTL(ring, tmp);
return true;
}
if (IS_GEN6(dev) &&
(tmp & RING_WAIT_SEMAPHORE)) {
DRM_ERROR("Kicking stuck semaphore on %s\n",
ring->name);
I915_WRITE_CTL(ring, tmp);
return true;
}
return false;
}