This is a note to let you know that I've just added the patch titled
mtd: cfi_cmdset_0001.c: fix resume for LH28F640BF chips
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mtd-cfi_cmdset_0001.c-fix-resume-for-lh28f640bf-chips.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 89cf38dd536a7301d6b5f5ddd73f42074c01bfaa Mon Sep 17 00:00:00 2001
From: Dmitry Eremin-Solenikov <[email protected]>
Date: Thu, 23 Oct 2014 01:23:01 +0200
Subject: mtd: cfi_cmdset_0001.c: fix resume for LH28F640BF chips
From: Dmitry Eremin-Solenikov <[email protected]>
commit 89cf38dd536a7301d6b5f5ddd73f42074c01bfaa upstream.
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 <[email protected]>
Signed-off-by: Andrea Adami <[email protected]>
Signed-off-by: Brian Norris <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/mtd/chips/cfi_cmdset_0001.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/mtd/chips/cfi_cmdset_0001.c
+++ b/drivers/mtd/chips/cfi_cmdset_0001.c
@@ -2590,6 +2590,8 @@ static void cfi_intelext_resume(struct m
/* 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);
Patches currently in stable-queue which might be from [email protected] are
queue-3.17/spi-pxa2xx-toggle-clocks-on-suspend-if-not-disabled-by-runtime-pm.patch
queue-3.17/mtd-cfi_cmdset_0001.c-fix-resume-for-lh28f640bf-chips.patch
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