linux-kernel - RE: [PATCH v2 2/2] scsi: ufs-mediatek: add error recovery for suspend and resume

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Date:   Fri, 27 Mar 2020 17:54:56 +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>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "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>
Subject: RE: [PATCH v2 2/2] scsi: ufs-mediatek: add error recovery for
 suspend and resume

Hi Avri,

On Fri, 2020-03-27 at 09:23 +0000, Avri Altman wrote:
> > 
> > Once fail happens during suspend and resume flow if the desired low
> > power link state is H8, link recovery is required for MediaTek UFS
> > controller.
> > 
> > For resume flow, since power and clocks are already enabled before
> > invoking vendor's resume callback, simply using ufshcd_link_recovery()
> > inside callback is fine.
> > 
> > For suspend flow, the device power enters low power mode or is disabled
> > before suspend callback, thus ufshcd_link_recovery() can not be directly
> > used in callback. To leverage host reset flow during ufshcd_suspend(),
> > set link as off state enforcedly 
> Not sure this is a proper English, but I'm not sure.
> 
> to let ufshcd_host_reset_and_restore()
> > be executed by ufshcd_suspend().

Thanks for your review! I will fix this sentence in next version.

Stanley Chu