Re: [PATCH] drm/amdgpu: Put GPU CG/PG ungate in device_fini_hw and device_halt

["Lazar, Lijo" <lijo.lazar@amd.com>]

On 02-Feb-26 12:01 PM, Yifan Zhang wrote:
> Protect GC registers in amdgpu_irq_disable_all() and amdgpu_fence_driver_hw_fini().
> 

Probably refine to keep it generic like "Protect all IP register 
accesses if in powergated state like gfxoff"

> Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>

Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>

Thanks,
Lijo

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index e69ab8a923e3..095730c7ef8f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3506,9 +3506,6 @@ static int amdgpu_device_ip_fini_early(struct amdgpu_device *adev)
>   		}
>   	}
>   
> -	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
> -	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
> -
>   	amdgpu_amdkfd_suspend(adev, true);
>   	amdgpu_amdkfd_teardown_processes(adev);
>   	amdgpu_userq_suspend(adev);
> @@ -4904,6 +4901,9 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
>   		amdgpu_virt_fini_data_exchange(adev);
>   	}
>   
> +	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
> +	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
> +
>   	/* disable all interrupts */
>   	amdgpu_irq_disable_all(adev);
>   	if (adev->mode_info.mode_config_initialized) {
> @@ -7362,6 +7362,9 @@ void amdgpu_device_halt(struct amdgpu_device *adev)
>   	amdgpu_xcp_dev_unplug(adev);
>   	drm_dev_unplug(ddev);
>   
> +	amdgpu_device_set_pg_state(adev, AMD_PG_STATE_UNGATE);
> +	amdgpu_device_set_cg_state(adev, AMD_CG_STATE_UNGATE);
> +
>   	amdgpu_irq_disable_all(adev);
>   
>   	amdgpu_fence_driver_hw_fini(adev);