[PATCH] drm/amdgpu: disallow gfxoff until GC IP blocks complete s2idle resume

[Liang, Prike]

[Public]

-----Original Message-----
From: Alex Deucher <alexdeucher at gmail.com>
Sent: Friday, October 21, 2022 9:39 PM
To: Liang, Prike <Prike.Liang at amd.com>
Cc: amd-gfx at lists.freedesktop.org; Deucher, Alexander <Alexander.Deucher at amd.com>; Huang, Ray <Ray.Huang at amd.com>
Subject: Re: [PATCH] drm/amdgpu: disallow gfxoff until GC IP blocks complete s2idle resume

On Thu, Oct 20, 2022 at 10:30 PM Prike Liang <Prike.Liang at amd.com> wrote:
>
> In the S2idle suspend/resume phase the gfxoff is keeping functional so
> some IP blocks will be likely to reinitialize at gfxoff entry and that
> will result in failing to program GC registers.Therefore, let disallow
> gfxoff until AMDGPU IPs reinitialized completely.
>
> Signed-off-by: Prike Liang <Prike.Liang at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++++
> drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c  | 5 +++++
>  2 files changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index e0445e8cc342..1624ed15fbc4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4185,6 +4185,10 @@ int amdgpu_device_resume(struct drm_device *dev, bool fbcon)
>         /* Make sure IB tests flushed */
>         flush_delayed_work(&adev->delayed_init_work);
>
> +       if (adev->in_s0ix) {
> +               amdgpu_gfx_off_ctrl(adev, true);
> +               DRM_DEBUG("will enable gfxoff for the mission mode\n");
> +       }
>         if (fbcon)
>
> drm_fb_helper_set_suspend_unlocked(adev_to_drm(adev)->fb_helper,
> false);
>
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> index 4fe75dd2b329..3948dc5b1d6a 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
> @@ -1664,6 +1664,11 @@ static int smu_resume(void *handle)
>
>         dev_info(adev->dev, "SMU is resumed successfully!\n");
>
> +       if (adev->in_s0ix) {
> +               amdgpu_gfx_off_ctrl(adev, false);
> +               dev_dbg(adev->dev, "will disable gfxoff for re-initializing other blocks\n");
> +       }
> +

I think it would be better to put this in amdgpu_device.c so it's clear where its match is.  Also for raven based boards this will get missed because they still use the powerplay power code.

Alex

[Prike] I miss this amdgpu_gfx_off_ctrl() is a generic upper layer function but that should also work on Rave series, since on the Rave series will use another message PPSMC_MSG_GpuChangeState exit gfxoff. But it makes sense unify the operation of exiting gfxoff at an upper layer in amdgpu_device.c and I will update it at patch v2.

Thanks,
Prike
>         return 0;
>  }
>
> --
> 2.25.1
>