linux-kernel - [PATCH 3.10 105/268] ARM: dts: da850-evm: fix read access to SPI flash

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Date:   Mon, 19 Jun 2017 20:30:04 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Fabien Parent <fparent@...libre.com>, Sekhar Nori <nsekhar@...com>,
        Jiri Slaby <jslaby@...e.cz>, Olof Johansson <olof@...om.net>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 105/268] ARM: dts: da850-evm: fix read access to SPI flash

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

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>
Signed-off-by: Willy Tarreau <w@....eu>
---
 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 c914357..d3c206e 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";
-- 
2.8.0.rc2.1.gbe9624a