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    Subject[PATCH 5.4 031/177] drm/amdgpu/vcn1: add cancel_delayed_work_sync before power gate
    Date
    From: James Zhu <James.Zhu@amd.com>

    commit b95f045ea35673572ef46d6483ad8bd6d353d63c upstream.

    Add cancel_delayed_work_sync before set power gating state
    to avoid race condition issue when power gating.

    Signed-off-by: James Zhu <James.Zhu@amd.com>
    Reviewed-by: Leo Liu <leo.liu@amd.com>
    Acked-by: Christian König <christian.koenig@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/vcn_v1_0.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    --- a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
    +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
    @@ -233,9 +233,13 @@ static int vcn_v1_0_hw_fini(void *handle
    struct amdgpu_device *adev = (struct amdgpu_device *)handle;
    struct amdgpu_ring *ring = &adev->vcn.inst->ring_dec;

    + cancel_delayed_work_sync(&adev->vcn.idle_work);
    +
    if ((adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) ||
    - RREG32_SOC15(VCN, 0, mmUVD_STATUS))
    + (adev->vcn.cur_state != AMD_PG_STATE_GATE &&
    + RREG32_SOC15(VCN, 0, mmUVD_STATUS))) {
    vcn_v1_0_set_powergating_state(adev, AMD_PG_STATE_GATE);
    + }

    ring->sched.ready = false;


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