linux-kernel - Re: [PATCH 0/5] mmc: host: omap

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Message-ID: <20140424144822.GJ26661@saruman.home>
Date:	Thu, 24 Apr 2014 09:48:22 -0500
From:	Felipe Balbi <balbi@...com>
To:	Balaji T K <balajitk@...com>
CC:	<balbi@...com>, <chris@...ntf.net>, <ulf.hansson@...aro.org>,
	<linux-mmc@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/5] mmc: host: omap_hsmmc: a few improvements

On Thu, Apr 24, 2014 at 08:13:16PM +0530, Balaji T K wrote:
> On Thursday 24 April 2014 08:09 PM, Felipe Balbi wrote:
> >On Thu, Apr 24, 2014 at 08:01:19PM +0530, Balaji T K wrote:
> >>On Thursday 27 March 2014 05:34 AM, Felipe Balbi wrote:
> >>>Hi,
> >>>
> >>>this series lets us access the newer registers introduced
> >>>back in OMAP4 which give us some valid information about
> >>>the OMAP HSMMC IP like max block size, support for ADMA,
> >>>support for Retention.
> >>
> >>"Support for Retention" looks interesting, can you shed more lights on
> >>it
> >
> >HWINFO has a bit (bit 6) which tells you whether retention is supported,
> >it's in all TRMs since OMAP3630 or so.
> >
> >"6	RERETMODE		Retention mode generic parameter
> >				This bit field indicates whether the
> >				retention mode is supported using the
> >				pin PIRFFRET.
> >
> >				0x0: Retention mode disabled
> >				0x1: Retention mode enabled"
> >
> 
> I have seen that but just wondering how the driver can make use of it
> :-)

oh, perhaps you can use to conditionally save context. The difficulty is
knowing if we're going to RET or OFF, but that could be extrapolated
from pm_qos, perhaps ?!?

just a thought.

-- 
balbi

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