[MTD] NOR: leave Intel chips in read-array mode on suspend

During some testing with several samsung s3c24xx based
devices it was discovered that often the
cfi_cmdset_0001.c would not leave the chip in
read-array mode on suspend. this is an issue if the
same flash chip is used for the bootloader that needs
to be read on resume.

Signed-off-by: David Anders <danders@amltd.com>
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c
index 7ea49a0d5ec3..e24973636e61 100644
--- a/drivers/mtd/chips/cfi_cmdset_0001.c
+++ b/drivers/mtd/chips/cfi_cmdset_0001.c
@@ -2224,6 +2224,8 @@ static int cfi_intelext_suspend(struct mtd_info *mtd)
                 case FL_CFI_QUERY:
                 case FL_JEDEC_QUERY:
                         if (chip->oldstate == FL_READY) {
+                                /* place the chip in a known state before suspend */
+                                map_write(map, CMD(0xFF), cfi->chips[i].start);
                                 chip->oldstate = chip->state;
                                 chip->state = FL_PM_SUSPENDED;
                                 /* No need to wake_up() on this state change -