This is a note to let you know that I've just added the patch titled
ARM: dts: da850-evm: fix read access to SPI flash
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-dts-da850-evm-fix-read-access-to-spi-flash.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 43849785e1079f6606a31cb7fda92d1200849728 Mon Sep 17 00:00:00 2001
From: Fabien Parent <fparent@xxxxxxxxxxxx>
Date: Tue, 17 Jan 2017 13:57:42 +0100
Subject: ARM: dts: da850-evm: fix read access to SPI flash
From: Fabien Parent <fparent@xxxxxxxxxxxx>
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@xxxxxxxxxxxx>
Signed-off-by: Fabien Parent <fparent@xxxxxxxxxxxx>
[nsekhar@xxxxxx: subject line adjustment]
Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
---
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
@@ -85,6 +85,7 @@
#size-cells = <1>;
compatible = "m25p64";
spi-max-frequency = <30000000>;
+ m25p,fast-read;
reg = <0>;
partition@0 {
label = "U-Boot-SPL";
Patches currently in stable-queue which might be from fparent@xxxxxxxxxxxx are
queue-4.4/arm-dts-da850-evm-fix-read-access-to-spi-flash.patch
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