linux-kernel - [PATCH 3.12 188/235] ARM: dts: da850-evm: fix read access to SPI flash

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Message-Id: <983a8a1c922c603f6b5a8a4433a3cd17cd2fd83c.1485514374.git.jslaby@suse.cz>
Date:   Fri, 27 Jan 2017 11:55:21 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Fabien Parent <fparent@...libre.com>,
        Sekhar Nori <nsekhar@...com>, Jiri Slaby <jslaby@...e.cz>,
        Olof Johansson <olof@...om.net>
Subject: [PATCH 3.12 188/235] ARM: dts: da850-evm: fix read access to SPI flash

From: Fabien Parent <fparent@...libre.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

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@...libre.com>
Signed-off-by: Fabien Parent <fparent@...libre.com>
[nsekhar@...com: subject line adjustment]
Signed-off-by: Sekhar Nori <nsekhar@...com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>

Signed-off-by: Olof Johansson <olof@...om.net>
---
 arch/arm/boot/dts/da850-evm.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/da850-evm.dts b/arch/arm/boot/dts/da850-evm.dts
index 588ce58a2959..bd81f1da17a6 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";
-- 
2.11.0