linux-kernel - Re: [PATCH V4 1/2] scsi: ufs: Add DeepSleep feature

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Date:   Thu, 5 Nov 2020 09:42:46 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
CC:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "Avri Altman" <avri.altman@....com>, Bean Huo <huobean@...il.com>,
        Can Guo <cang@...eaurora.org>
Subject: Re: [PATCH V4 1/2] scsi: ufs: Add DeepSleep feature

On Tue, 2020-11-03 at 16:14 +0200, Adrian Hunter wrote:
> DeepSleep is a UFS v3.1 feature that achieves the lowest power consumption
> of the device, apart from power off.
> 
> In DeepSleep mode, no commands are accepted, and the only way to exit is
> using a hardware reset or power cycle.
> 
> This patch assumes that if a power cycle was an option, then power off
> would be preferable, so only exit via a hardware reset is supported.
> 
> 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.
> 
> It is assumed that UFS devices with wspecversion >= 0x310 support
> DeepSleep.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>