linux-kernel - RE: [PATCH RESEND v3 4/4] scsi: ufs-mediatek: gate ref-clk during Auto-Hibern8

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Date:   Sat, 1 Feb 2020 09:45:16 +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>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "andy.teng@...iatek.com" <andy.teng@...iatek.com>,
        "chun-hung.wu@...iatek.com" <chun-hung.wu@...iatek.com>,
        "kuohong.wang@...iatek.com" <kuohong.wang@...iatek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>
Subject: RE: [PATCH RESEND v3 4/4] scsi: ufs-mediatek: gate ref-clk during
 Auto-Hibern8

Hi Avri,

On Fri, 2020-01-31 at 18:48 +0000, Avri Altman wrote:
> > 
> > +static u32 ufs_mtk_link_get_state(struct ufs_hba *hba)
> > +{
> > +       u32 val;
> > +
> > +       ufshcd_writel(hba, 0x20, REG_UFS_DEBUG_SEL);
> > +       val = ufshcd_readl(hba, REG_UFS_PROBE);
> > +       val = val >> 28;
> > +
> > +       return val;
> > +}
> A little bit strange that you are relying on debug registers to setup your ref-clock.
> Is this this debug info is always available?
> 

Yes, this register is only for this purpose now (query link state) and
always existed in MediaTek UFS host.

Thanks,
Stanley