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Date:   Mon, 5 Oct 2020 09:51:08 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>
Subject: RE: [PATCH 1/2] scsi: ufs: Add DeepSleep feature

> 
> 
> On 5/10/20 11:02 am, Avri Altman wrote:
> > HI,
> >
> >> Drivers that wish to support DeepSleep need to set a new capability flag
> >> UFSHCD_CAP_DEEPSLEEP and provide a hardware reset via the existing
> >>  ->device_reset() callback.
> > I would expect that this capability controls sending SSU 4, but it only controls
> the sysfs entry?
> 
> The sysfs entry is the only way to request DeepSleep.
Some chipset vendors use their own modules, or even the device tree
to set their default rpm_lvl / spm_lvl.

Thanks,
Avri

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