linux-kernel - Re: [PATCH] mtd: cfi_cmdset_0001.c: fix resume for LH28F640BF chips

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Message-ID: <20141030015459.GG23619@ld-irv-0074>
Date:	Wed, 29 Oct 2014 18:54:59 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Andrea Adami <andrea.adami@...il.com>
Cc:	linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	Christian Riesch <christian.riesch@...cron.at>,
	Jingoo Han <jg1.han@...sung.com>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: cfi_cmdset_0001.c: fix resume for LH28F640BF chips

On Thu, Oct 23, 2014 at 01:23:01AM +0200, Andrea Adami wrote:
> After '#echo mem > /sys/power/state' some devices can not be properly resumed
> because apparently the MTD Partition Configuration Register has been reset
> to default thus the rootfs cannot be mounted cleanly on resume.
> An example of this can be found in the SA-1100 Developer's Manual at 9.5.3.3
> where the second step of the Sleep Shutdown Sequence is described:
> "An internal reset is applied to the SA-1100. All units are reset...".
> 
> As workaround we refresh the PCR value as done initially on chip setup.
> 
> This behavior and the fix are confirmed by our tests done on 2 different Zaurus
> collie units with kernel 3.17.
> 
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> Signed-off-by: Andrea Adami <andrea.adami@...il.com>

Pushed to l2-mtd.git/for-3.18. Changed the author to Dmitry and added
the following:

Fixes: 812c5fa82bae: ("mtd: cfi_cmdset_0001.c: add support for Sharp LH28F640BF NOR")
Cc: <stable@...r.kernel.org> # 3.16+

Thanks,
Brian
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