drm/msm: Remove exclusive-fence hack

The workaround was initially necessary due to dma_resv having only a
single exclusive fence slot, yet whe don't necessarily know what order
the gpu scheduler will schedule jobs.  Unfortunately this workaround
also has the result of forcing implicit sync, even when userspace does
not want it.

However, since commit 047a1b877ed4 ("dma-buf & drm/amdgpu: remove
dma_resv workaround") the workaround is no longer needed.  So remove
it.  This effectively reverts commit f1b3f696a084 ("drm/msm: Don't
break exclusive fence ordering")

Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/509457/
Link: https://lore.kernel.org/r/20221101214051.159988-1-robdclark@gmail.com

diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 5599d93ec0d21d281d56418852fff9ae8be77f10..cc48f73adadfb50f21edf4fed0befe28a135b929 100644 (file)
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -334,8 +334,7 @@ static int submit_fence_sync(struct msm_gem_submit *submit, bool no_implicit)
                if (ret)
                        return ret;
 
-               /* exclusive fences must be ordered */
-               if (no_implicit && !write)
+               if (no_implicit)
                        continue;
 
                ret = drm_sched_job_add_implicit_dependencies(&submit->base,