linux-kernel - Re: [Patch v1 1/1] mfd: fix for i2c issue DA9052/53 PMIC

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Date:	Mon, 26 Nov 2012 00:14:07 +0100
From:	Samuel Ortiz <sameo@...ux.intel.com>
To:	Ashish Jangam <ashish.jangam@...tcummins.com>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Axel Lin <axel.lin@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, David Dajun Chen <dchen@...semi.com>
Subject: Re: [Patch v1 1/1] mfd: fix for i2c issue DA9052/53 PMIC

Hi Ashish,

On Fri, Nov 02, 2012 at 04:17:26PM +0530, Ashish Jangam wrote:
> There is an issue where the DA9052/53-AA/BA/BB PMIC either locks up or fails to
> respond following a system Reset. This could result in a second write
> in which the bus writes the current content of the write buffer to address
> of the last I2C access.
> 
> The failure case is where this unwanted write transfers incorrect data to
> a critical register.
> 
> This patch fixes this issue by following any read or write with a dummy read
> to a safe register address. A safe register address is one where the contents
> will not affect the operation of the system.
> 
> Signed-off-by: David Dajun Chen <dchen@...semi.com>
> Signed-off-by: Ashish Jangam <ashish.jangam@...tcummins.com>
> ---
>  drivers/mfd/da9052-i2c.c          |   56 +++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/da9052/da9052.h |   47 ++++++++++++++++++++++++++++--
>  include/linux/mfd/da9052/reg.h    |    3 ++
>  3 files changed, 102 insertions(+), 4 deletions(-)
Applied to my for-linus branch.

Cheers,
Samuel.

-- 
Intel Open Source Technology Centre
http://oss.intel.com/
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