linux-kernel - Re: [PATCH v1] scsi: ufs-mediatek: Enable UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH

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Date:   Wed, 23 Dec 2020 12:41:08 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com, jejb@...ux.ibm.com,
        beanhuo@...ron.com, asutoshd@...eaurora.org,
        matthias.bgg@...il.com, bvanassche@....org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, andy.teng@...iatek.com,
        chaotian.jing@...iatek.com, cc.chou@...iatek.com,
        jiajie.hao@...iatek.com, alice.chao@...iatek.com
Subject: Re: [PATCH v1] scsi: ufs-mediatek: Enable
 UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL

On 2020-12-23 12:19, Stanley Chu wrote:
> Hi Can,
> 
> On Tue, 2020-12-22 at 19:34 +0800, Can Guo wrote:
>> On 2020-12-22 15:29, Stanley Chu wrote:
>> > Flush during hibern8 is sufficient on MediaTek platforms, thus
>> > enable UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL to skip enabling
>> > fWriteBoosterBufferFlush during WriteBooster initialization.
>> >
>> > Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
>> > ---
>> >  drivers/scsi/ufs/ufs-mediatek.c | 1 +
>> >  1 file changed, 1 insertion(+)
>> >
>> > diff --git a/drivers/scsi/ufs/ufs-mediatek.c
>> > b/drivers/scsi/ufs/ufs-mediatek.c
>> > index 80618af7c872..c55202b92a43 100644
>> > --- a/drivers/scsi/ufs/ufs-mediatek.c
>> > +++ b/drivers/scsi/ufs/ufs-mediatek.c
>> > @@ -661,6 +661,7 @@ static int ufs_mtk_init(struct ufs_hba *hba)
>> >
>> >  	/* Enable WriteBooster */
>> >  	hba->caps |= UFSHCD_CAP_WB_EN;
>> > +	hba->quirks |= UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL;
>> >  	hba->vps->wb_flush_threshold = UFS_WB_BUF_REMAIN_PERCENT(80);
>> >
>> >  	if (host->caps & UFS_MTK_CAP_DISABLE_AH8)
>> 
>> I guess we need it too...
> 
> AHHA, if you decide to add this in your platform too later, maybe we
> could change the way it does: Keep manual flush disabled by default and
> remove this quirk.
> 

Yeah... I will get back with an answer later.

Thanks,

Can Guo.

> Thanks,
> Stanley Chu
>> 
>> Change LGTM.
>> 
>> Regards,
>> 
>> Can Guo.