[LEDE-DEV] [PATCH] mtd: Fix the soft reboot problem found on MediaTek devices with 32M Flash.

[L. D. Pinney]

This patch resets the spi to 3 byte mode needed for devices with more than 16M Flash.
Tested on the Onion Omega2+ (MT7688)

Signed-off-by: L. D. Pinney <ldpinney at gmail.com>
Tested-by: Nita Vesa <werecatf at gmail.com>

---

diff --git a/target/linux/ramips/patches-4.4/101-spi-reset-to-3-byte-mode.patch b/target/linux/ramips/patches-4.4/101-spi-reset-to-3-byte-mode.patch
new file mode 100644
index 0000000..b126411
--- /dev/null
+++ b/target/linux/ramips/patches-4.4/101-spi-reset-to-3-byte-mode.patch
@@ -0,0 +1,24 @@
+Index: linux-4.4.40/drivers/mtd/devices/m25p80.c
+===================================================================
+--- linux-4.4.40.orig/drivers/mtd/devices/m25p80.c
++++ linux-4.4.40/drivers/mtd/devices/m25p80.c
+@@ -261,6 +261,11 @@ static int m25p_remove(struct spi_device
+ {
+ 	struct m25p	*flash = spi_get_drvdata(spi);
+ 
++		flash->command[0] = 0x66;
++		spi_write(flash->spi, flash->command, 1);
++		flash->command[0] = 0x99;
++		spi_write(flash->spi, flash->command, 1);
++
+ 	/* Clean up MTD stuff. */
+ 	return mtd_device_unregister(&flash->spi_nor.mtd);
+ }
+@@ -328,6 +333,7 @@ static struct spi_driver m25p80_driver =
+ 	.id_table	= m25p_ids,
+ 	.probe	= m25p_probe,
+ 	.remove	= m25p_remove,
++	.shutdown = m25p_remove,
+ 
+ 	/* REVISIT: many of these chips have deep power-down modes, which
+ 	 * should clearly be entered on suspend() to minimize power use.