linux-kernel - [PATCH 1/3] mtd: m25p80: disable SST software protection bits by default

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Message-Id: <1254777289-32109-2-git-send-email-vapier@gentoo.org>
Date:	Mon,  5 Oct 2009 17:14:47 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
	David Woodhouse <dwmw2@...radead.org>,
	Graf Yang <graf.yang@...log.com>
Subject: [PATCH 1/3] mtd: m25p80: disable SST software protection bits by default

From: Graf Yang <graf.yang@...log.com>

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@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 drivers/mtd/devices/m25p80.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 379c316..933267a 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);
 	}
-- 
1.6.5.rc2

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