linux-kernel - RE: [PATCH v2 1/3] scsi: ufs: add write booster feature support

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Message-ID: <SN6PR04MB4640D6EFA64A15E3624E081EFCD20@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Wed, 22 Apr 2020 10:28:55 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Asutosh Das <asutoshd@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Bean Huo <beanhuo@...ron.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Colin Ian King <colin.king@...onical.com>,
        Bart Van Assche <bvanassche@....org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 1/3] scsi: ufs: add write booster feature support


> +
> +       if (!hba->dev_info.b_presrv_uspc_en &&
> +           (avail_buf <= UFS_WB_10_PERCENT_BUF_REMAIN))
> +               return true;
If you are in reduced mode, but avail_buf > 10%,
you still get into ufshcd_wb_presrv_usrspc_keep_vcc_on(),
Which you don't want.

> +
> +       return ufshcd_wb_presrv_usrspc_keep_vcc_on(hba, avail_buf);
> +}
> +

Thanks,
Avri