drm/amdgpu/vcn2: don't access register when power gated

It will cause bus hang to access register UVD_STATUS
when VCN is in the state of power gated.

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v2_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v2_0.c
index 36a80e4..04cac0b 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v2_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v2_0.c
@@ -277,7 +277,8 @@ static int vcn_v2_0_hw_fini(void *handle)
        struct amdgpu_ring *ring = &adev->vcn.ring_dec;
        int i;
 
-       if (RREG32_SOC15(VCN, 0, mmUVD_STATUS))
+       if (adev->vcn.cur_state != AMD_PG_STATE_GATE &&
+           RREG32_SOC15(VCN, 0, mmUVD_STATUS))
                vcn_v2_0_set_powergating_state(adev, AMD_PG_STATE_GATE);
 
        ring->sched.ready = false;