From: Fabien Parent <fparent@baylibre.com>
Date: Tue, 17 Jan 2017 12:57:42 +0000 (+0100)
Subject: ARM: dts: da850-evm: fix read access to SPI flash
X-Git-Tag: v3.12.70~46
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=983a8a1c922c603f6b5a8a4433a3cd17cd2fd83c;p=thirdparty%2Fkernel%2Fstable.git

ARM: dts: da850-evm: fix read access to SPI flash

commit 43849785e1079f6606a31cb7fda92d1200849728 upstream.

Read access to the SPI flash are broken on da850-evm, i.e. the data
read is not what is actually programmed on the flash.
According to the datasheet for the M25P64 part present on the da850-evm,
if the SPI frequency is higher than 20MHz then the READ command is not
usable anymore and only the FAST_READ command can be used to read data.

This commit specifies in the DTS that we should use FAST_READ command
instead of the READ command.

Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Fabien Parent <fparent@baylibre.com>
[nsekhar@ti.com: subject line adjustment]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

Signed-off-by: Olof Johansson <olof@lixom.net>
---

diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index 588ce58a2959f..bd81f1da17a66 100644
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -59,6 +59,7 @@
 				#size-cells = <1>;
 				compatible = "m25p64";
 				spi-max-frequency = <30000000>;
+				m25p,fast-read;
 				reg = <0>;
 				partition@0 {
 					label = "U-Boot-SPL";