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

[Pan, Xinhui]

Prike
I hit this issue too. reboot hung with my vega10.  it is ok with navi10.
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Liang, Prike <Prike.Liang at amd.com>
Sent: Sunday, April 12, 2020 11:49:39 AM
To: Johannes Hirte <johannes.hirte at datenkhaos.de>
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Huang, Ray <Ray.Huang at amd.com>; Quan, Evan <Evan.Quan at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Subject: RE: [PATCH v2] drm/amdgpu: fix gfx hang during suspend with video playback (v2)

Thanks update and verify. Could you give more detail information and error log message
about you observed issue?

Thanks,
Prike
> -----Original Message-----
> From: Johannes Hirte <johannes.hirte at datenkhaos.de>
> Sent: Sunday, April 12, 2020 7:56 AM
> 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>;
> Quan, Evan <Evan.Quan at amd.com>
> Subject: Re: [PATCH v2] drm/amdgpu: fix gfx hang during suspend with video
> playback (v2)
>
> 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

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