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drm/i915: Clear stop-engine for a pardoned reset

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If we pardon a per-engine reset, we may leave the STOP_RING bit asserted
in RING_MI_MODE resulting in the engine hanging. Unconditionally clear
it on the per-engine exit path as we know that either we skipped the
reset and so need the cancellation, or the reset was successful and the
cancellation is a no-op, or there was an error and we will follow up
with a full-reset or wedging (both of which will stop the engines again
as required).

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107188
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106560
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180814171857.24673-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2018-08-14 18:18:57 +01:00
parent 08ea70a417
commit a99b32a6ff
3 changed files with 12 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_drv.c
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@@ -2079,6 +2079,7 @@ int i915_reset_engine(struct intel_engine_cs *engine, const char *msg)
goto out;
out:
intel_engine_cancel_stop_cs(engine);
i915_gem_reset_finish_engine(engine);
return ret;
}