linux-kernel - RE: [PATCH] scsi: ufs: core: fix devfreq deadlocks

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Message-ID: <DM6PR04MB657555DBC49DF54716A98B6DFCF59@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Wed, 4 Jan 2023 08:24:24 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bart Van Assche <bvanassche@....org>,
        Johan Hovold <johan+linaro@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Can Guo <quic_cang@...cinc.com>
Subject: RE: [PATCH] scsi: ufs: core: fix devfreq deadlocks

 
> On 12/22/22 02:21, Johan Hovold wrote:
> > +     /* Enable Write Booster if we have scaled up else disable it */
> > +     if (ufshcd_enable_wb_if_scaling_up(hba))
> > +             ufshcd_wb_toggle(hba, scale_up);
> 
> Hi Asutosh,
> 
> This patch is the second complaint about the mechanism that toggles the
> WriteBooster during clock scaling. Can this mechanism be removed entirely?
commit 87bd05016a64 that introduced UFSHCD_CAP_WB_WITH_CLK_SCALING enables
the platform vendors and OEMs to maintain wb toggling - should they choose so.
Why remove it in its entirety?

Thanks,
Avri

> 
> I think this commit introduced that mechanism: 3d17b9b5ab11 ("scsi: ufs:
> Add write booster feature support"; v5.8).
> 
> Thanks,
> 
> Bart.