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

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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>

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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

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drivers/gpu/drm/msm/adreno/a6xx_gpu.c

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