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drm/i915: Kick waiters on resetting legacy rings 

For reasons unknown, interrupts following a reset do not arrive, but
this can be papered over by kicking any waiter and peeking at the
breadcrumbs following the reset.

Testcase: igt/gem_eio/reset-stress
References: https://bugs.freedesktop.org/show_bug.cgi?id=105957
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180730075351.15569-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2018-07-30 08:53:50 +01:00
parent 86c1c87d0e
commit 39f3be162c
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -527,6 +527,8 @@ static int init_ring_common(struct intel_engine_cs *engine)
if (INTEL_GEN(dev_priv) > 2)
I915_WRITE_MODE(engine, _MASKED_BIT_DISABLE(STOP_RING));
/* Papering over lost _interrupts_ immediately following the restart */
intel_engine_wakeup(engine);
out:
intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);