linux-kernel - RE: [PATCH v2 1/5] scsi: ufs: allow legacy UFS devices to enable WriteBooster

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Date:   Thu, 30 Apr 2020 07:44:44 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Stanley Chu <stanley.chu@...iatek.com>,
        "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>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>
CC:     "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "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 1/5] scsi: ufs: allow legacy UFS devices to enable
 WriteBooster

Hi Stanley,
 
> 
> WriteBooster feature may be supported by some legacy UFS devices
> (i.e., < 3.1) by upgrading firmware.
> 
> To enable WriteBooster feature in such devices, relax the entrance
> condition of ufshcd_wb_probe() to allow host driver to check those
> devices' WriteBooster capability.
> 
> WriteBooster feature can be available if below both conditions are
> satisfied,
> 
> 1. Device descriptor has dExtendedUFSFeaturesSupport field.
> 2. WriteBooster support is specified in above field.
> 
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
> Reviewed-by: Bean Huo <beanhuo@...ron.com>
WB was first introduced as part of UFS3.1, and lately as part of UFS2.2.
Any non-standard behavior should be classified as a quirk.

Thanks,
Avri