Patch "drm: msm: adreno: Disable preemption on Adreno 510" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    drm: msm: adreno: Disable preemption on Adreno 510

to the 5.15-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-adreno-disable-preemption-on-adreno-510.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 20146e06041bf9a2e5b3d39f47b9e82d6f65e65f
Author: Adam Skladowski <a39.skl@xxxxxxxxx>
Date:   Tue Mar 14 23:17:17 2023 +0100

    drm: msm: adreno: Disable preemption on Adreno 510
    
    [ Upstream commit 010c8bbad2cb8c33c47963e29f051f1e917e45a5 ]
    
    Downstream driver appears to not support preemption on A510 target,
    trying to use one make device slow and fill log with rings related errors.
    Set num_rings to 1 to disable preemption.
    
    Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Fixes: e20c9284c8f2 ("drm/msm/adreno: Add support for Adreno 510 GPU")
    Signed-off-by: Adam Skladowski <a39.skl@xxxxxxxxx>
    Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
    Patchwork: https://patchwork.freedesktop.org/patch/526898/
    Link: https://lore.kernel.org/r/20230314221757.13096-1-a39.skl@xxxxxxxxx
    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 b8c49ba65254c..d92416d526286 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1749,6 +1749,7 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 	struct a5xx_gpu *a5xx_gpu = NULL;
 	struct adreno_gpu *adreno_gpu;
 	struct msm_gpu *gpu;
+	unsigned int nr_rings;
 	int ret;
 
 	if (!pdev) {
@@ -1769,7 +1770,12 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 
 	check_speed_bin(&pdev->dev);
 
-	ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 4);
+	nr_rings = 4;
+
+	if (adreno_is_a510(adreno_gpu))
+		nr_rings = 1;
+
+	ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, nr_rings);
 	if (ret) {
 		a5xx_destroy(&(a5xx_gpu->base.base));
 		return ERR_PTR(ret);



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