linux-kernel - RE: [PATCH v7 1/8] scsi: ufs: enable WriteBooster on some pre-3.1 UFS devices

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Message-ID: <SN6PR04MB4640F483F0821F76DF6C344AFCA20@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Fri, 8 May 2020 07:35:43 +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 v7 1/8] scsi: ufs: enable WriteBooster on some pre-3.1 UFS
 devices

> 
> WriteBooster feature can be supported by some pre-3.1 UFS devices
> by upgrading firmware.
> 
> To enable WriteBooster feature in such devices, introduce a device
> quirk to 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 all conditions are
> satisfied,
> 
> 1. Host enables WriteBooster capability
> 2. UFS 3.1 device or UFS pre-3.1 device with quirk
>    UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES enabled
> 3. The device descriptor shall have
>    DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP field
> 4. WriteBooster support is specified in above field
> 
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
Reviewed-by: Avri Altman <avri.altman@....com>