[Public]
> -----Original Message-----
> From: Alex Deucher <alexdeucher@xxxxxxxxx>
> Sent: Thursday, February 10, 2022 09:28
> To: Limonciello, Mario <Mario.Limonciello@xxxxxxx>
> Cc: Mahapatra, Rajib <Rajib.Mahapatra@xxxxxxx>; Liang, Prike
> <Prike.Liang@xxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>;
> amd-gfx@xxxxxxxxxxxxxxxxxxxxx; S, Shirish <Shirish.S@xxxxxxx>
> Subject: Re: [PATCH v2] drm/amdgpu: skipping SDMA hw_init and hw_fini for
> S0ix.
>
> On Thu, Feb 10, 2022 at 9:04 AM Limonciello, Mario
> <Mario.Limonciello@xxxxxxx> wrote:
> >
> > [Public]
> >
> >
> >
> > > -----Original Message-----
> > > From: Mahapatra, Rajib <Rajib.Mahapatra@xxxxxxx>
> > > Sent: Thursday, February 10, 2022 07:35
> > > To: Liang, Prike <Prike.Liang@xxxxxxx>; Limonciello, Mario
> > > <Mario.Limonciello@xxxxxxx>; Deucher, Alexander
> > > <Alexander.Deucher@xxxxxxx>
> > > Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx; S, Shirish <Shirish.S@xxxxxxx>;
> > > Mahapatra, Rajib <Rajib.Mahapatra@xxxxxxx>
> > > 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@xxxxxxx>
>
> Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
>
> I presume sdma_v5.2.c needs a similar fix?
VG doesn't do s0i3 right?
No, YC should not take a similar fix. YC had an architectural change and to
avoid a "similar" problem takes 26db706a6d77b9e184feb11725e97e53b7a89519.
>
> Alex
>
>
> >
> > > Signed-off-by: Rajib Mahapatra <rajib.mahapatra@xxxxxxx>
> > > ---
> > > 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
