[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>

diff --git a/drivers/mtd/chips/cfi_cmdset_0001.c b/drivers/mtd/chips/cfi_cmdset_0001.c
index 7ea49a0..e249736 100644 (file)
--- 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 -