linux-kernel - RE: [PATCH v1 1/1] scsi: ufshcd: Allow zero value setting to Auto-Hibernate Timer

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Message-ID: <1599183556.10649.24.camel@mtkswgap22>
Date:   Fri, 4 Sep 2020 09:39:16 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Avri Altman <Avri.Altman@....com>
CC:     "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "Alim Akhtar" <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Nitin Rawat <nitirawa@...eaurora.org>,
        Bean Huo <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 1/1] scsi: ufshcd: Allow zero value setting to
 Auto-Hibernate Timer

On Wed, 2020-09-02 at 05:10 +0000, Avri Altman wrote:
> > 
> > On 2020-08-29 00:32, Avri Altman wrote:
> > >>
> > >> The zero value Auto-Hibernate Timer is a valid setting, and it
> > >> indicates the Auto-Hibernate feature being disabled. Correctly
> > > Right. So " ufshcd_auto_hibern8_enable" is no longer an appropriate
> > > name.
> > > Maybe ufshcd_auto_hibern8_set instead?
> > Thanks for your comment. I am ok with the name change suggestion.
> > >
> > > Also, did you verified that no other platform relies on its non-zero
> > > value?
> > I only tested the change on Qualcomm's platform. I do not have other
> > platforms to do the test.
> > The UFS host controller spec JESD220E, Section 5.2.5 says
> > "Software writes “0” to disable Auto-Hibernate Idle Timer". So the spec
> > supports this zero value.
> > Some options:
> > - We could add a hba->caps so that we only apply the change for
> > Qualcomm's platforms.
> > This is not preferred because it is following the spec implementations.
> > - Or other platforms that do not support the zero value needs a caps.
> Yeah, I don't think another caps is required,
> Maybe just an ack from Stanley.

Looks good to me.

Acked-by: Stanley Chu <stanley.chu@...iatek.com>

> 
> Thanks,
> Avri