[3.11.y.z extended stable] Patch "clk: armada-370: fix tclk frequencies" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    clk: armada-370: fix tclk frequencies

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From b99c1fa7c3b231c7a4dc8cee404263646a38d09b Mon Sep 17 00:00:00 2001
From: Simon Guinot <simon.guinot at sequanux.org>
Date: Thu, 3 Oct 2013 12:05:02 +0200
Subject: clk: armada-370: fix tclk frequencies

commit 1022c75f5abd3a3b25e679bc8793d21bedd009b4 upstream.

This patch fixes the tclk frequency array for the Armada-370 SoC.
This bug has been introduced by commit 6b72333d
("clk: mvebu: add Armada 370 SoC-centric clock init").

A wrong tclk frequency affects the following drivers: mvsdio, mvneta,
i2c-mv64xxx and mvebu-devbus. This list may be incomplete.

About the mvneta Ethernet driver, note that the tclk frequency is used
to compute the Rx time coalescence. Then, this bug harms the coalescence
configuration and also degrades the networking performances with the
default values.

Signed-off-by: Simon Guinot <simon.guinot at sequanux.org>
Cc: Andrew Lunn <andrew at lunn.ch>
Cc: Gregory CLEMENT <gregory.clement at free-electrons.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth at gmail.com>
Acked-by: Jason Cooper <jason at lakedaemon.net>
Signed-off-by: Michael Turquette <mturquette at deferred.io>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/clk/mvebu/armada-370.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/mvebu/armada-370.c b/drivers/clk/mvebu/armada-370.c
index fc777bd..81a202d 100644
--- a/drivers/clk/mvebu/armada-370.c
+++ b/drivers/clk/mvebu/armada-370.c
@@ -39,8 +39,8 @@ static const struct coreclk_ratio a370_coreclk_ratios[] __initconst = {
 };

 static const u32 a370_tclk_freqs[] __initconst = {
-	16600000,
-	20000000,
+	166000000,
+	200000000,
 };

 static u32 __init a370_get_tclk_freq(void __iomem *sar)
--
1.8.3.2