linux-kernel - [PATCH 4.4 29/42] ARM: dts: da850-evm: fix read access to SPI flash

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Message-Id: <20170124075510.526196814@linuxfoundation.org>
Date:   Tue, 24 Jan 2017 08:55:39 +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 4.4 29/42] ARM: dts: da850-evm: fix read access to SPI flash

4.4-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
@@ -85,6 +85,7 @@
 				#size-cells = <1>;
 				compatible = "m25p64";
 				spi-max-frequency = <30000000>;
+				m25p,fast-read;
 				reg = <0>;
 				partition@0 {
 					label = "U-Boot-SPL";