[PATCH] drm/amd/powerplay: clear VBIOS scratchs on baco exit

[Quan, Evan]

Hi Xiaojie,

This was reported by Zhigang team.  Under their special use case, scratch register 7 has be to 0 to perform asic init(@Luo, Zhigang right?).
And considering old asics(vega20/10) also applied this change.
So, I think it's reasonable(and recommend by SMU fw team) to apply this on the new ASICs also.

Regards,
Evan
> -----Original Message-----
> From: Yuan, Xiaojie <Xiaojie.Yuan at amd.com>
> Sent: Friday, December 6, 2019 12:20 PM
> To: Quan, Evan <Evan.Quan at amd.com>
> Cc: amd-gfx at lists.freedesktop.org; Luo, Zhigang <Zhigang.Luo at amd.com>
> Subject: Re: [PATCH] drm/amd/powerplay: clear VBIOS scratchs on baco exit
> 
> Hi Evan,
> 
> Just out of curiosity, may I know what issue are you trying to fix?
> I used to see vbios post failure (hangs in atombios init table) after baco exit
> occasionally on navi.
> 
> BR,
> Xiaojie
> 
> > On Dec 6, 2019, at 11:37 AM, Evan Quan <evan.quan at amd.com> wrote:
> >
> > This is needed for coming asic init on performing gpu reset.
> >
> > Change-Id: If3671a24d239e3d288665fadaa2c40c87d5da40b
> > Signed-off-by: Evan Quan <evan.quan at amd.com>
> > ---
> > drivers/gpu/drm/amd/powerplay/smu_v11_0.c | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
> b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
> > index 39ec06aee809..ab809df7bc35 100644
> > --- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
> > +++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
> > @@ -1659,6 +1659,12 @@ int smu_v11_0_baco_set_state(struct
> smu_context *smu, enum smu_baco_state state)
> >        }
> >    } else {
> >        ret = smu_send_smc_msg(smu, SMU_MSG_ExitBaco);
> > +        if (ret)
> > +            goto out;
> > +
> > +        WREG32_SOC15(NBIO, 0, mmBIOS_SCRATCH_6, 0);
> > +        WREG32_SOC15(NBIO, 0, mmBIOS_SCRATCH_7, 0);
> > +
> >        bif_doorbell_intr_cntl = REG_SET_FIELD(bif_doorbell_intr_cntl,
> >                        BIF_DOORBELL_INT_CNTL,
> >                        DOORBELL_INTERRUPT_DISABLE, 0);
> > --
> > 2.24.0
> >
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