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Message-Id: <20170124075537.731027736@linuxfoundation.org>
Date: Tue, 24 Jan 2017 08:55:08 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Kevin Hilman <khilman@...libre.com>,
Fabien Parent <fparent@...libre.com>,
Sekhar Nori <nsekhar@...com>, Olof Johansson <olof@...om.net>
Subject: [PATCH 4.9 068/130] ARM: dts: da850-evm: fix read access to SPI flash
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Olof Johansson <olof@...om.net>
---
arch/arm/boot/dts/da850-evm.dts | 1 +
1 file changed, 1 insertion(+)
--- a/arch/arm/boot/dts/da850-evm.dts
+++ b/arch/arm/boot/dts/da850-evm.dts
@@ -99,6 +99,7 @@
#size-cells = <1>;
compatible = "m25p64";
spi-max-frequency = <30000000>;
+ m25p,fast-read;
reg = <0>;
partition@0 {
label = "U-Boot-SPL";
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