On Fri, Sep 28, 2018 at 4:04 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > 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. Really? It's part of the UFS spec. The document I have specifies that I shouldn't reproduce without permission, but it's in JESD220A section 7.2.4 UFS-Sleep Power Mode. -Evan
