drm/msm: Disable preemption on all 5xx targets

commit 7b3f3948c8b7053d771acc9f79810cc410f5e2e0 upstream.

Temporarily disable preemption on a5xx targets pending some improvements
to protect the RPTR shadow from being corrupted.

Cc: stable@vger.kernel.org
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index 7829247de60e0690cf4d1249cf792dd5e5b23a4f..4a484b06319ffb23b0f1a9deea4da17e9067d82a 100644 (file)
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1451,7 +1451,8 @@ 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);
+       /* Restricting nr_rings to 1 to temporarily disable preemption */
+       ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 1);
        if (ret) {
                a5xx_destroy(&(a5xx_gpu->base.base));
                return ERR_PTR(ret);