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

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);
 	}