From: Stanley Chu <stanley.chu@mediatek.com>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>,
"James E . J . Bottomley" <jejb@linux.ibm.com>,
<linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
Alim Akhtar <alim.akhtar@samsung.com>,
"Avri Altman" <avri.altman@wdc.com>, Bean Huo <huobean@gmail.com>,
Can Guo <cang@codeaurora.org>
Subject: Re: [PATCH V4 1/2] scsi: ufs: Add DeepSleep feature
Date: Thu, 5 Nov 2020 09:42:46 +0800 [thread overview]
Message-ID: <1604540566.13152.16.camel@mtkswgap22> (raw)
In-Reply-To: <20201103141403.2142-2-adrian.hunter@intel.com>
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@intel.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
next prev parent reply other threads:[~2020-11-05 1:43 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-03 14:14 [PATCH V4 0/2] scsi: ufs: Add DeepSleep feature Adrian Hunter
2020-11-03 14:14 ` [PATCH V4 1/2] " Adrian Hunter
2020-11-04 8:04 ` Can Guo
2020-11-04 8:29 ` Can Guo
2020-11-04 8:37 ` Adrian Hunter
2020-11-04 9:03 ` Can Guo
2020-11-04 10:57 ` Bean Huo
2020-11-04 11:55 ` Adrian Hunter
2020-11-04 13:19 ` Bean Huo
2020-11-04 16:35 ` Asutosh Das (asd)
2020-11-05 1:42 ` Stanley Chu [this message]
2020-11-03 14:14 ` [PATCH V4 2/2] scsi: ufs: Allow an error return value from ->device_reset() Adrian Hunter
2020-11-04 2:55 ` Stanley Chu
2020-11-04 8:05 ` Can Guo
2020-11-04 8:44 ` Bean Huo
2020-11-04 16:35 ` Asutosh Das (asd)
2020-11-05 4:06 ` [PATCH V4 0/2] scsi: ufs: Add DeepSleep feature Martin K. Petersen
2020-11-11 2:58 ` Martin K. Petersen
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