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mtd: cfi_cmdset_0001.c: fix resume for LH28F640BF chips

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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.

Fixes: 812c5fa82bae: ("mtd: cfi_cmdset_0001.c: add support for Sharp LH28F640BF NOR")
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Cc: <stable@vger.kernel.org> # 3.16+
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Dmitry Eremin-Solenikov 2014-10-23 01:23:01 +02:00 committed by Brian Norris
parent 0c53b4e7e2
commit 89cf38dd53
1 changed files with 2 additions and 0 deletions
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2
drivers/mtd/chips/cfi_cmdset_0001.c
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@ -2590,6 +2590,8 @@ static void cfi_intelext_resume(struct mtd_info *mtd)
/* Go to known state. Chip may have been power cycled */
if (chip->state == FL_PM_SUSPENDED) {
/* Refresh LH28F640BF Partition Config. Register */
fixup_LH28F640BF(mtd);
map_write(map, CMD(0xFF), cfi->chips[i].start);
chip->oldstate = chip->state = FL_READY;
wake_up(&chip->wq);