linux-kernel - Re: [PATCH v5 14/15] scsi: ufs: add device quirk delay before putting UFS rails in LPM

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Message-ID: <56D54B5F.9070204@suse.de>
Date:	Tue, 1 Mar 2016 15:57:19 +0800
From:	Hannes Reinecke <hare@...e.de>
To:	Yaniv Gardi <ygardi@...eaurora.org>,
	James.Bottomley@...senPartnership.com
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org,
	Subhash Jadavani <subhashj@...eaurora.org>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v5 14/15] scsi: ufs: add device quirk delay before putting
 UFS rails in LPM

On 02/28/2016 09:32 PM, Yaniv Gardi wrote:
> We put the UFS device in sleep state & UFS link in hibern8 state during
> runtime suspaned. After this we put all the UFS rails in low power
> modes immediately but it seems some devices may still draw more than
> sleep current from UFS rails (especially from VCCQ rail) atleast for
> 500us.
> To avoid this situation, this change adds 2ms delay before putting
> these UFS rails in LPM mode.
> 
> Reviewed-by: Gilad Broner <gbroner@...eaurora.org>
> Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
> 
> ---
>  drivers/scsi/ufs/ufs_quirks.c |  4 ++++
>  drivers/scsi/ufs/ufs_quirks.h | 11 ++++++++++-
>  drivers/scsi/ufs/ufshcd.c     | 10 ++++++++++
>  3 files changed, 24 insertions(+), 1 deletion(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)