This is a note to let you know that I've just added the patch titled
ARM: at91: sama5d3: reduce TWI internal clock frequency
to the 3.12-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-at91-sama5d3-reduce-twi-internal-clock-frequency.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 58e7b1d5826ac6a64b1101d8a70162bc084a7d1e Mon Sep 17 00:00:00 2001
From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Date: Fri, 22 Nov 2013 17:08:43 +0100
Subject: ARM: at91: sama5d3: reduce TWI internal clock frequency
From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
commit 58e7b1d5826ac6a64b1101d8a70162bc084a7d1e upstream.
With some devices, transfer hangs during I2C frame transmission. This issue
disappears when reducing the internal frequency of the TWI IP. Even if it is
indicated that internal clock max frequency is 66MHz, it seems we have
oversampling on I2C signals making TWI believe that a transfer in progress
is done.
This fix has no impact on the I2C bus frequency.
Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Acked-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-at91/sama5d3.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/arm/mach-at91/sama5d3.c
+++ b/arch/arm/mach-at91/sama5d3.c
@@ -95,19 +95,19 @@ static struct clk twi0_clk = {
.name = "twi0_clk",
.pid = SAMA5D3_ID_TWI0,
.type = CLK_TYPE_PERIPHERAL,
- .div = AT91_PMC_PCR_DIV2,
+ .div = AT91_PMC_PCR_DIV8,
};
static struct clk twi1_clk = {
.name = "twi1_clk",
.pid = SAMA5D3_ID_TWI1,
.type = CLK_TYPE_PERIPHERAL,
- .div = AT91_PMC_PCR_DIV2,
+ .div = AT91_PMC_PCR_DIV8,
};
static struct clk twi2_clk = {
.name = "twi2_clk",
.pid = SAMA5D3_ID_TWI2,
.type = CLK_TYPE_PERIPHERAL,
- .div = AT91_PMC_PCR_DIV2,
+ .div = AT91_PMC_PCR_DIV8,
};
static struct clk mmc0_clk = {
.name = "mci0_clk",
Patches currently in stable-queue which might be from ludovic.desroches@xxxxxxxxx are
queue-3.12/arm-at91-sama5d3-reduce-twi-internal-clock-frequency.patch
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