tree 6d8650424e83c4188993050ff8cebedab81a99f1
parent 0961d7fe12491b474546952e25b441b9e56915c6
author Rob Clark <robdclark@chromium.org> 1597276989 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1599125063 +0200

drm/msm/adreno: fix updating ring fence

[ Upstream commit f228af11dfa1d1616bc67f3a4119ab77c36181f1 ]

We need to set it to the most recent completed fence, not the most
recent submitted.  Otherwise we have races where we think we can retire
submits that the GPU is not finished with, if the GPU doesn't manage to
overwrite the seqno before we look at it.

This can show up with hang recovery if one of the submits after the
crashing submit also hangs after it is replayed.

Fixes: f97decac5f4c ("drm/msm: Support multiple ringbuffers")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>