linux-kernel - RE: [PATCH 3/4] scsi: ufs-mediatek: Fix flag of unipro low-power mode

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Date:   Tue, 27 Oct 2020 17:52:15 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Avri Altman <Avri.Altman@....com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kuohong.wang@...iatek.com" <kuohong.wang@...iatek.com>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
        "andy.teng@...iatek.com" <andy.teng@...iatek.com>,
        "chaotian.jing@...iatek.com" <chaotian.jing@...iatek.com>,
        "cc.chou@...iatek.com" <cc.chou@...iatek.com>
Subject: RE: [PATCH 3/4] scsi: ufs-mediatek: Fix flag of unipro low-power
 mode

Hi Avri,

On Sat, 2020-09-19 at 08:08 +0000, Avri Altman wrote:
> > 
> > Forcibly leave UniPro low-power mode if UIC commands is failed.
> > This makes hba_enable_delay_us as correct (default) value for
> > re-enabling the host.
> > 
> > At the same time, change type of parameter "lpm" in function
> > ufs_mtk_unipro_set_pm() to "bool".
> Semantically, better leave it u32 as its eventually assigned to the arg3 of the uic command 
> 

Thanks for reminding.
I will use specific u32 values while sending arg3 to fix this.

> > 
> > Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
> > ---
> >  drivers/scsi/ufs/ufs-mediatek.c | 20 ++++++++++++++------
> >  1 file changed, 14 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
> > index 887c03e8bcc0..feba74a72309 100644
> > --- a/drivers/scsi/ufs/ufs-mediatek.c
> > +++ b/drivers/scsi/ufs/ufs-mediatek.c
> > @@ -419,7 +419,7 @@ static int ufs_mtk_pwr_change_notify(struct ufs_hba
> > *hba,
> >         return ret;
> >  }
> > 
> > -static int ufs_mtk_unipro_set_pm(struct ufs_hba *hba, u32 lpm)
> > +static int ufs_mtk_unipro_set_pm(struct ufs_hba *hba, bool lpm)
> >  {
> >         int ret;
> >         struct ufs_mtk_host *host = ufshcd_get_variant(hba);
> > @@ -427,8 +427,14 @@ static int ufs_mtk_unipro_set_pm(struct ufs_hba
> > *hba, u32 lpm)
> >         ret = ufshcd_dme_set(hba,
> >                              UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
> >                              lpm);
> > -       if (!ret)
> > +       if (!ret || !lpm) {
> > +               /*
> > +                * Forcibly set as non-LPM mode if UIC commands is failed
> > +                * to use default hba_enable_delay_us value for re-enabling
> > +                * the host.
> > +                */
> >                 host->unipro_lpm = lpm;
> Maybe just host->unipro_lpm = false; instead

This statement shall stay like this for case: "lpm = true"

Thanks,
Stanley Chu