From: David Anders <dave123_aml@yahoo.com>
To: linux-mtd <linux-mtd@lists.infradead.org>
Cc: nico@cam.org
Subject: patch to leave cfi in read-array on suspend(reposted)
Date: Thu, 19 Oct 2006 07:05:29 -0700 (PDT) [thread overview]
Message-ID: <20061019140534.10858.qmail@web54408.mail.yahoo.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 674 bytes --]
greetings,
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. attached is a patch generated
against the 2.6.18 kernel and has been tested with
several s3c24xx based devices as well as several sharp
lh79520 devices. your feedback would be appreciated.
Signed-off-by: David Anders <danders@amltd.com>
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[-- Attachment #2: 3238585821-cfi_cmdset_0001.patch --]
[-- Type: application/octet-stream, Size: 524 bytes --]
--- linux-2.6.18/drivers/mtd/chips/cfi_cmdset_0001.c 2006-09-19 23:42:06.000000000 -0400
+++ linux-2.6.18-m5900/drivers/mtd/chips/cfi_cmdset_0001.c 2006-09-22 09:16:21.000000000 -0400
@@ -2224,6 +2224,8 @@
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 -
next reply other threads:[~2006-10-19 14:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-19 14:05 David Anders [this message]
2006-10-19 14:21 ` patch to leave cfi in read-array on suspend(reposted) Nicolas Pitre
2006-10-19 14:26 ` Artem Bityutskiy
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