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

[Brian Norris <computersforpeace@gmail.com>]

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@gmail.com>
> Signed-off-by: Andrea Adami <andrea.adami@gmail.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@vger.kernel.org> # 3.16+

Thanks,
Brian