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

[Hannes Reinecke]

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@xxxxxxxxxxxxxx>
> Signed-off-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
> Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
> 
> ---
>  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@xxxxxxx>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
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