linux-kernel - RE: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability

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Message-ID: <DM6PR04MB65752AAE8DA57C715C5BE3ADFC349@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Sun, 30 Oct 2022 12:11:33 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bart Van Assche <bvanassche@....org>,
        Asutosh Das <quic_asutoshd@...cinc.com>,
        "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     "quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
        "quic_xiaosenh@...cinc.com" <quic_xiaosenh@...cinc.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "eddie.huang@...iatek.com" <eddie.huang@...iatek.com>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        "mani@...nel.org" <mani@...nel.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "quic_richardp@...cinc.com" <quic_richardp@...cinc.com>,
        "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>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue
 capability

> 
> On 10/20/22 11:03, Asutosh Das wrote:
> > +
> > +     /*
> > +      * This capability allows the host controller driver to turn on/off
> > +      * MCQ mode. MCQ mode may be used to increase performance.
> > +      */
> > +     UFSHCD_CAP_MCQ_EN                               = 1 << 12,
Needs rebase?
UFSHCD_CAP_WB_WITH_CLK_SCALING already occupies that bit.

Thanks,
Avri

> >   };
> 
> I prefer that the above flag would only be introduced after a need
> appears to disable MCQ, e.g. discovery of a host controller that is too
> broken to enable MCQ.
> 
> Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users
> have a way to disable MCQ, e.g. via a kernel module parameter?
> 
> Thanks,
> 
> Bart.