github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-23 22:14:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/msm/a6xx: Use CX AO Counter register for timestamp on a750 GPUs

Browse Source 
The a750 uses the GMU CX AO Counters instead of the GMU_ALWAYS_ON_COUNTER
register on A6xx and other A7xx GPUs, use it when running a A750 GPU.

The GMU_ALWAYS_ON_COUNTER at offset 0x1f888 doesn't seem to exist
on the SM8650 A750 GMU and returns 0, but the CX AO counter at offset
0x1f880 returns some proper timestamp data.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/752235/
Message-ID: <20260909-topic-sm8650-gmu-a750-timestamp-reg-v2-2-091d74958951@linaro.org>
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
This commit is contained in:
Neil Armstrong 2026-09-09 15:07:38 +02:00 committed by Rob Clark
parent ed9ad3d418
commit a2b6583798
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/msm/adreno/a6xx_gpu.c
View File

@ -23,9 +23,15 @@ static u64 a6xx_gmu_get_timestamp(struct msm_gpu *gpu)
u64 count_hi, count_lo, temp;
do {
count_hi = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H);
count_lo = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_L);
temp = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H);
if (adreno_is_a750_family(adreno_gpu)) {
count_hi = gmu_read(&a6xx_gpu->gmu, REG_A7XX_GMU_CX_AO_COUNTER_H);
count_lo = gmu_read(&a6xx_gpu->gmu, REG_A7XX_GMU_CX_AO_COUNTER_L);
temp = gmu_read(&a6xx_gpu->gmu, REG_A7XX_GMU_CX_AO_COUNTER_H);
} else {
count_hi = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H);
count_lo = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_L);
temp = gmu_read(&a6xx_gpu->gmu, REG_A6XX_GMU_ALWAYS_ON_COUNTER_H);
}
} while (unlikely(count_hi != temp));
return (count_hi << 32) | count_lo;