[PATCH v2] drm/amdgpu: skipping SDMA hw_init and hw_fini for S0ix.

[Alex Deucher]

On Thu, Feb 10, 2022 at 9:04 AM Limonciello, Mario
<Mario.Limonciello at amd.com> wrote:
>
> [Public]
>
>
>
> > -----Original Message-----
> > From: Mahapatra, Rajib <Rajib.Mahapatra at amd.com>
> > Sent: Thursday, February 10, 2022 07:35
> > To: Liang, Prike <Prike.Liang at amd.com>; Limonciello, Mario
> > <Mario.Limonciello at amd.com>; Deucher, Alexander
> > <Alexander.Deucher at amd.com>
> > Cc: amd-gfx at lists.freedesktop.org; S, Shirish <Shirish.S at amd.com>;
> > Mahapatra, Rajib <Rajib.Mahapatra at amd.com>
> > Subject: [PATCH v2] drm/amdgpu: skipping SDMA hw_init and hw_fini for S0ix.
> >
> > [Why]
> > SDMA ring buffer test failed if suspend is aborted during
> > S0i3 resume.
> >
> > [How]
> > If suspend is aborted for some reason during S0i3 resume
> > cycle, it follows SDMA ring test failing and errors in amdgpu
> > resume. For RN/CZN/Picasso, SMU saves and restores SDMA
> > registers during S0ix cycle. So, skipping SDMA suspend and
> > resume from driver solves the issue. This time, the system
> > is able to resume gracefully even the suspend is aborted.
> >
> > v2: add changes on sdma_v4, skipping SDMA hw_init and hw_fini.
>
> This line in the commit message should be "below" the ---
>
> Besides that the code is better.
>
> Reviewed-by: Mario Limonciello <mario.limonciello at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

I presume sdma_v5.2.c needs a similar fix?

Alex


>
> > Signed-off-by: Rajib Mahapatra <rajib.mahapatra at amd.com>
> > ---
> >  drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > index 06a7ceda4c87..02115d63b071 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> > @@ -2058,6 +2058,10 @@ static int sdma_v4_0_suspend(void *handle)
> >  {
> >       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> >
> > +     /* SMU saves SDMA state for us */
> > +     if (adev->in_s0ix)
> > +             return 0;
> > +
> >       return sdma_v4_0_hw_fini(adev);
> >  }
> >
> > @@ -2065,6 +2069,10 @@ static int sdma_v4_0_resume(void *handle)
> >  {
> >       struct amdgpu_device *adev = (struct amdgpu_device *)handle;
> >
> > +     /* SMU restores SDMA state for us */
> > +     if (adev->in_s0ix)
> > +             return 0;
> > +
> >       return sdma_v4_0_hw_init(adev);
> >  }
> >
> > --
> > 2.25.1