[PATCH v2] drm/amdgpu: fix gfx hang during suspend with video playback (v2)

[Johannes Hirte]

On 2020 Apr 07, Prike Liang wrote:
> The system will be hang up during S3 suspend because of SMU is pending
> for GC not respose the register CP_HQD_ACTIVE access request.This issue
> root cause of accessing the GC register under enter GFX CGGPG and can
> be fixed by disable GFX CGPG before perform suspend.
> 
> v2: Use disable the GFX CGPG instead of RLC safe mode guard.
> 
> Signed-off-by: Prike Liang <Prike.Liang at amd.com>
> Tested-by: Mengbing Wang <Mengbing.Wang at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 2e1f955..bf8735b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -2440,8 +2440,6 @@ static int amdgpu_device_ip_suspend_phase1(struct amdgpu_device *adev)
>  {
>  	int i, r;
>  
> -	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
> -	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
>  
>  	for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
>  		if (!adev->ip_blocks[i].status.valid)
> @@ -3470,6 +3468,9 @@ int amdgpu_device_suspend(struct drm_device *dev, bool fbcon)
>  		}
>  	}
>  
> +	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
> +	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
> +
>  	amdgpu_amdkfd_suspend(adev, !fbcon);
>  
>  	amdgpu_ras_suspend(adev);


This breaks shutdown/reboot on my system (Dell latitude 5495). 

-- 
Regards,
  Johannes Hirte