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    Subject[PATCH 5.5 082/150] drm/amdgpu/gfx10: disable gfxoff when reading rlc clock
    Date
    From: Alex Deucher <alexander.deucher@amd.com>

    commit b08c3ed609aabc4e76e74edc4404f0c26279d7ed upstream.

    Otherwise we readback all ones. Fixes rlc counter
    readback while gfxoff is active.

    Reviewed-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Cc: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
    +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
    @@ -3909,11 +3909,13 @@ static uint64_t gfx_v10_0_get_gpu_clock_
    {
    uint64_t clock;

    + amdgpu_gfx_off_ctrl(adev, false);
    mutex_lock(&adev->gfx.gpu_clock_mutex);
    WREG32_SOC15(GC, 0, mmRLC_CAPTURE_GPU_CLOCK_COUNT, 1);
    clock = (uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_LSB) |
    ((uint64_t)RREG32_SOC15(GC, 0, mmRLC_GPU_CLOCK_COUNT_MSB) << 32ULL);
    mutex_unlock(&adev->gfx.gpu_clock_mutex);
    + amdgpu_gfx_off_ctrl(adev, true);
    return clock;
    }


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