On Thu, Dec 14, 2023 at 12:43:02PM +0530, Nitin Rawat wrote:
>
>
> On 12/8/2023 6:59 PM, Nitin Rawat wrote:
> >
> >
> > On 12/8/2023 3:58 PM, Manivannan Sadhasivam wrote:
> > > On Fri, Dec 08, 2023 at 02:55:21PM +0530, Nitin Rawat wrote:
> > > >
> > > >
> > > > On 12/8/2023 12:28 PM, Manivannan Sadhasivam wrote:
> > > > > core_reset is optional, so there is no need to warn the user
> > > > > if it is not
> > > > > available.
> > > > >
> > > > > Reviewed-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
> > > > > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> > > > > ---
> > > > > drivers/ufs/host/ufs-qcom.c | 4 +---
> > > > > 1 file changed, 1 insertion(+), 3 deletions(-)
> > > > >
> > > > > diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
> > > > > index dc93b1c5ca74..d474de0739e4 100644
> > > > > --- a/drivers/ufs/host/ufs-qcom.c
> > > > > +++ b/drivers/ufs/host/ufs-qcom.c
> > > > > @@ -296,10 +296,8 @@ static int ufs_qcom_host_reset(struct
> > > > > ufs_hba *hba)
> > > > > struct ufs_qcom_host *host = ufshcd_get_variant(hba);
> > > > > bool reenable_intr;
> > > > > - if (!host->core_reset) {
> > > > > - dev_warn(hba->dev, "%s: reset control not set\n", __func__);
> > > > > + if (!host->core_reset)
> > > > > return 0;
> > > > > - }
> > > > > reenable_intr = hba->is_irq_enabled;
> > > > > disable_irq(hba->irq);
> > > >
> > > >
> > > > Hi Mani,
> > > >
> > > > I think core reset is not frequent. It happen during only probe ,error
> > > > handler.
> > > >
> > > > core reset is needed in kernel to cleanup UFS phy and controller
> > > > configuration before UFS HLOS operation starts as per HPG.
> > > >
> > >
> > > This sounds like core reset is not an optional property but a
> > > required one. I
> > > just checked the upstream DT files for all SoCs, and looks like
> > > pretty much all
> > > of them support core reset.
> > >
> > > Only MSM8996 doesn't have the reset property, but the reset is
> > > available in GCC.
> > > So we should be able to use it in dtsi.
> > >
> > > I also skimmed through the HPG and looks like core reset is not
> > > optional. Please
> > > confirm.
> > >
> > > - Mani
> >
> >
> > Hi Mani,
> >
> > Yes Core_reset is part of HPG sequence and is needed.
> >
> > Regards,
> > Nitin
>
>
> Hi Mani,
>
> I see this patch series is merged . So planning to keep the warn message
> based on above discussion.
>
No, you should not add that warning back. As per our discussion, we concluded
that core_reset is not optional, so devm_reset_control_get_exclusive() should be
used to acquire the reset.
If the reset property is not present in DT, then ufs_qcom_init() will fail. This
also means that we should fix the binding and DT of SoCs missing the reset
property.
- Mani
> Regards,
> Nitin
> >
> >
> > >
> > > > Having existing warn print can be used to to debug or atleast know
> > > > core_reset is missed in device tree to give indication complete
> > > > reset hasn't
> > > > been done and we could still be operating in bootloader configuration.
> > > >
> > > >
> > > > Regards,
> > > > Nitin
> > > >
> > >
> >
--
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