linux-kernel - RE: [PATCH] regulator: twl-regulator

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Message-ID: <4892AA4CA40C485CBF3C8BD5F3B35016@india.ti.com>
Date:	Thu, 4 Nov 2010 15:00:55 +0530
From:	"Lesly Arackal Manuel" <leslyam@...com>
To:	"'Nayak, Rajendra'" <rnayak@...com>,
	"'Liam Girdwood'" <lrg@...mlogic.co.uk>
Cc:	"'Axel Lin'" <axel.lin@...il.com>,
	"'linux-kernel'" <linux-kernel@...r.kernel.org>,
	"'Juha Keski-Saari'" <ext-juha.1.keski-saari@...ia.com>,
	"'Mark Brown'" <broonie@...nsource.wolfsonmicro.com>
Subject: RE: [PATCH] regulator: twl-regulator - fix twlreg_set_mode


I have tested it with MMC card inserted on OMAP3630SDP board (using OMAP3
integration tree).

The changes seem to be valid.

The i2c_transfer() returns '1' on success and the twl_i2c_write() which
calls i2c_transfer returns '0' if success and err value if it fails.

After writing the MSB if it returns with check:
if (status >= 0)
	return status;
It is not writing the LSB.

So it should be:
if (status < 0)
	return status;

Regards,
Lesly AM

> -----Original Message-----
> From: Nayak, Rajendra [mailto:rnayak@...com]
> Sent: Tuesday, October 26, 2010 3:40 PM
> To: Liam Girdwood
> Cc: Axel Lin; linux-kernel; Juha Keski-Saari; Mark Brown; Manuel, Lesly
> Arackal
> Subject: RE: [PATCH] regulator: twl-regulator - fix twlreg_set_mode
> 
> 
> 
> > -----Original Message-----
> > From: Liam Girdwood [mailto:lrg@...mlogic.co.uk]
> > Sent: Saturday, October 23, 2010 7:17 PM
> > To: Nayak, Rajendra
> > Cc: Axel Lin; linux-kernel; Juha Keski-Saari; Mark Brown
> > Subject: Re: [PATCH] regulator: twl-regulator - fix twlreg_set_mode
> >
> > On Fri, 2010-10-22 at 08:30 -0700, Mark Brown wrote:
> > > On Fri, Oct 22, 2010 at 04:38:22PM +0800, Axel Lin wrote:
> > > > The Singular Message is 16 bits:
> > > >         DEV_GRP[15:13] MT[12]  RES_ID[11:4]  RES_STATE[3:0]
> > > >
> > > > Current implementation return immedially after sucessfuly write MSB
> part.
> > > > To properly set mode, we need to write the complete message ( MSB
> and LSB ).
> > > >
> > > > In twl.h, now we have defines for PM Master module register offsets,
> > > > use it instead of hard coded 0x15/0x16.
> > > >
> > > > Use "message & 0xff" to ensure we send correct value for LSB.
> > > >
> > > > Signed-off-by: Axel Lin <axel.lin@...il.com>
> > >
> > > Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> > >
> > > > I don't have this hardware handy, I appreciate if someone who has
> the
> > > > hardware can test this patch.
> > >
> > > I beleive Liam has appropriate hardware.
> >
> > Rejendra, care to test this ?
> 
> Sure, either me or Lesly will test this on one of the twl4030 based
> platforms
> and update.
> 
> >
> > Thanks
> >
> > Liam
> > --
> > Freelance Developer, SlimLogic Ltd
> > ASoC and Voltage Regulator Maintainer.
> > http://www.slimlogic.co.uk


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