This is a note to let you know that I've just added the patch titled
drm/msm: Fix a5xx/a6xx timestamps
to the 4.19-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-fix-a5xx-a6xx-timestamps.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3d65819248ed64e17b237d38da7d43680f700c6b
Author: Rob Clark <robdclark@xxxxxxxxxxxx>
Date: Wed Mar 24 18:23:52 2021 -0700
drm/msm: Fix a5xx/a6xx timestamps
[ Upstream commit 9fbd3088351b92e8c2cef6e37a39decb12a8d5bb ]
They were reading a counter that was configured to ALWAYS_COUNT (ie.
cycles that the GPU is doing something) rather than ALWAYS_ON. This
isn't the thing that userspace is looking for.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Acked-by: Jordan Crouse <jordan@xxxxxxxxxxxxxxxxx>
Message-Id: <20210325012358.1759770-2-robdclark@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 776bbe9775e9..ba513018534e 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1194,8 +1194,8 @@ static int a5xx_pm_suspend(struct msm_gpu *gpu)
static int a5xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
{
- *value = gpu_read64(gpu, REG_A5XX_RBBM_PERFCTR_CP_0_LO,
- REG_A5XX_RBBM_PERFCTR_CP_0_HI);
+ *value = gpu_read64(gpu, REG_A5XX_RBBM_ALWAYSON_COUNTER_LO,
+ REG_A5XX_RBBM_ALWAYSON_COUNTER_HI);
return 0;
}
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index c629f742a1d1..c280fdc44939 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -713,8 +713,8 @@ static int a6xx_get_timestamp(struct msm_gpu *gpu, uint64_t *value)
/* Force the GPU power on so we can read this register */
a6xx_gmu_set_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
- *value = gpu_read64(gpu, REG_A6XX_RBBM_PERFCTR_CP_0_LO,
- REG_A6XX_RBBM_PERFCTR_CP_0_HI);
+ *value = gpu_read64(gpu, REG_A6XX_CP_ALWAYS_ON_COUNTER_LO,
+ REG_A6XX_CP_ALWAYS_ON_COUNTER_HI);
a6xx_gmu_clear_oob(&a6xx_gpu->gmu, GMU_OOB_GPU_SET);
return 0;
