From: Graf Yang <graf.yang@analog.com>
Date: Thu, 24 Sep 2009 19:46:22 +0000 (-0400)
Subject: mtd: m25p80: disable SST software protection bits by default
X-Git-Tag: v2.6.33-rc1~66^2~72
X-Git-Url: https://bbs.cooldavid.org/git/?a=commitdiff_plain;h=ea60658a08f8f3511a70587b27f12cd7e0ac5ae3;p=net-next-2.6.git

mtd: m25p80: disable SST software protection bits by default

The SST SPI flashes is like Atmel SPI flashes in that the software
protection bits are set by default at power up, so clear them at init
time.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
---

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 379c316f329..933267a7a2a 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -775,11 +775,12 @@ static int __devinit m25p_probe(struct spi_device *spi)
 	dev_set_drvdata(&spi->dev, flash);
 
 	/*
-	 * Atmel serial flash tend to power up
-	 * with the software protection bits set
+	 * Atmel and SST serial flash tend to power
+	 * up with the software protection bits set
 	 */
 
-	if (info->jedec_id >> 16 == 0x1f) {
+	if (info->jedec_id >> 16 == 0x1f ||
+	    info->jedec_id >> 16 == 0xbf) {
 		write_enable(flash);
 		write_sr(flash, 0);
 	}