This is a note to let you know that I've just added the patch titled
drm/msm/a5xx: fix setting of the CP_PREEMPT_ENABLE_LOCAL register
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-a5xx-fix-setting-of-the-cp_preempt_enable_lo.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit febc42d9e37a3232c01520d0f1acbd422f5f0538
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Tue Feb 14 05:09:53 2023 +0300
drm/msm/a5xx: fix setting of the CP_PREEMPT_ENABLE_LOCAL register
[ Upstream commit a7a4c19c36de1e4b99b06e4060ccc8ab837725bc ]
Rather than writing CP_PREEMPT_ENABLE_GLOBAL twice, follow the vendor
kernel and set CP_PREEMPT_ENABLE_LOCAL register instead. a5xx_submit()
will override it during submission, but let's get the sequence correct.
Fixes: b1fc2839d2f9 ("drm/msm: Implement preemption for A5XX targets")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/522638/
Link: https://lore.kernel.org/r/20230214020956.164473-2-dmitry.baryshkov@xxxxxxxxxx
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index e3579e5ffa146..593b8d83179c9 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -135,8 +135,8 @@ static void a5xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
OUT_RING(ring, 1);
/* Enable local preemption for finegrain preemption */
- OUT_PKT7(ring, CP_PREEMPT_ENABLE_GLOBAL, 1);
- OUT_RING(ring, 0x02);
+ OUT_PKT7(ring, CP_PREEMPT_ENABLE_LOCAL, 1);
+ OUT_RING(ring, 0x1);
/* Allow CP_CONTEXT_SWITCH_YIELD packets in the IB2 */
OUT_PKT7(ring, CP_YIELD_ENABLE, 1);
