From: Bean Huo <huobean@gmail.com>
To: Adrian Hunter <adrian.hunter@intel.com>,
alim.akhtar@samsung.com, avri.altman@wdc.com,
asutoshd@codeaurora.org, jejb@linux.ibm.com,
martin.petersen@oracle.com, stanley.chu@mediatek.com,
beanhuo@micron.com, bvanassche@acm.org, tomas.winkler@intel.com,
cang@codeaurora.org
Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 1/6] scsi: ufs: Add "wb_on" sysfs node to control WB on/off
Date: Tue, 19 Jan 2021 17:31:45 +0100 [thread overview]
Message-ID: <0fb16957375cc5916b61aa6ea2c13c64455f1d35.camel@gmail.com> (raw)
In-Reply-To: <9ad2cf1a-68df-47ef-9fe7-01954d2d6181@intel.com>
On Tue, 2021-01-19 at 12:00 +0200, Adrian Hunter wrote:
> > > Is it so, that after a full reset, WB is always enabled again?
> > > Is
> > > that
> > > intended?
> >
> > Hello Adrian
> > Good questions. yes, after a full reset, the UFS device side by
> > default
> > is wb disabled, then WB will be always enabled agaion in
> > ufshcd_wb_config(hba). but, for the platform which
> > supports UFSHCD_CAP_CLK_SCALING, wb will be disabled again while
> > clk
> > scaling down and enabled while clk scaling up.
> >
> > Regarding the last question, I think OEM wants to do that. maybe
> > they
> > suppose there will be a lot of writing after reset?? From the UFS
> > device's point of view, the control of WB is up to the user.
>
> If it is by design enabled after reset, then perhaps it should be
> mentioned
> in the sysfs documentation.
ok, will add it in the next version.
thanks,
Bean
next prev parent reply other threads:[~2021-01-19 18:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 20:10 [PATCH v6 0/6] Several changes for UFS WriteBooster Bean Huo
2021-01-18 20:10 ` [PATCH v6 1/6] scsi: ufs: Add "wb_on" sysfs node to control WB on/off Bean Huo
2021-01-19 7:01 ` Adrian Hunter
2021-01-19 9:33 ` Bean Huo
2021-01-19 10:00 ` Adrian Hunter
2021-01-19 16:31 ` Bean Huo [this message]
2021-01-18 20:10 ` [PATCH v6 2/6] docs: ABI: Add wb_on documentation for UFS sysfs Bean Huo
2021-01-18 20:10 ` [PATCH v6 3/6] scsi: ufs: Changes comment in the function ufshcd_wb_probe() Bean Huo
2021-01-18 20:10 ` [PATCH v6 4/6] scsi: ufs: Remove two WB related fields from struct ufs_dev_info Bean Huo
2021-01-18 20:10 ` [PATCH v6 5/6] scsi: ufs: Group UFS WB related flags to " Bean Huo
2021-01-18 20:10 ` [PATCH v6 6/6] scsi: ufs: Cleanup WB buffer flush toggle implementation Bean Huo
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