[v3] drm/amdgpu: reset asic after system-wide suspend aborted (v3)

[Limonciello, Mario]

On 11/24/2021 23:48, Prike Liang wrote:
> Do ASIC reset at the moment Sx suspend aborted behind of amdgpu suspend
> to keep AMDGPU in a clean reset state and that can avoid re-initialize
> device improperly error. Currently,we just always do asic reset in the
> amdgpu resume until sort out the PM abort case.
> 
> v2: Remove incomplete PM abort flag and add GPU hive case check for
> GPU reset.
> 
> v3: Some dGPU reset method not support at the early resume time and
> temprorary skip the dGPU case.

FYI to you that this was tested on an issue with S3 exit to show success 
that you will want to include in a Fixes tag for v4 when you change it 
to just run for S3 path, not S0i3 path.

https://gitlab.freedesktop.org/drm/amd/-/issues/1822

> 
> Signed-off-by: Prike Liang <Prike.Liang at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 7d4115d..f6e1a6a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3983,6 +3983,14 @@ int amdgpu_device_resume(struct drm_device *dev, bool fbcon)
>   	if (adev->in_s0ix)
>   		amdgpu_gfx_state_change_set(adev, sGpuChangeState_D0Entry);
>   
> +	/*TODO: In order to not let all-always asic reset affect resume latency
> +	 * need sort out the case which really need asic reset in the resume process.
> +	 * As to the known issue on the system suspend abort behind the AMDGPU suspend,
> +	 * may can sort this case by checking struct suspend_stats which need exported
> +	 * firstly.
> +	 */
> +	if (adev->flags & AMD_IS_APU)
> +		amdgpu_asic_reset(adev);
>   	/* post card */
>   	if (amdgpu_device_need_post(adev)) {
>   		r = amdgpu_device_asic_init(adev);
>