From: Christoph Hellwig <hch@infradead.org>
To: Evan Green <evgreen@chromium.org>
Cc: Vinayak Holikatti <vinholikatti@gmail.com>,
"James E.J. Bottomley" <jejb@linux.vnet.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Stanislav Nijnikov <stanislav.nijnikov@wdc.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
Douglas Anderson <dianders@chromium.org>,
Gwendal Grignou <gwendal@chromium.org>
Subject: Re: [PATCH v2 2/2] scsi: ufs: Execute START_STOP_UNIT during init
Date: Fri, 28 Sep 2018 16:04:16 -0700 [thread overview]
Message-ID: <20180928230416.GA30772@infradead.org> (raw)
In-Reply-To: <20180928230203.905-3-evgreen@chromium.org>
On Fri, Sep 28, 2018 at 04:02:03PM -0700, Evan Green wrote:
> For UFS devices that are provisioned to have an initial power mode
> (bInitPowerMode) of "sleep", Linux will currently fail to enumerate
> the device. This is because the UFS specification says that the
> device must get a START_STOP_UNIT SCSI command to wake the unit
> up before other common initialization features like the device
> descriptor will be available to be read.
Yikes, this is just completely broken in terms of scsi compliance.
I think we should simply not support such devices.
next prev parent reply other threads:[~2018-09-28 23:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-28 23:02 [PATCH v2 0/2] scsi: ufs: Enable bInitPowerMode of sleep Evan Green
2018-09-28 23:02 ` [PATCH v2 1/2] scsi: ufs: Allow SCSI commands early during init Evan Green
2018-09-28 23:02 ` [PATCH v2 2/2] scsi: ufs: Execute START_STOP_UNIT " Evan Green
2018-09-28 23:04 ` Christoph Hellwig [this message]
2018-09-28 23:09 ` Evan Green
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