This is a note to let you know that I've just added the patch titled
ARM: i.MX35: enable MAX clock
to the 3.8-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-i.mx35-enable-max-clock.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 5dc2eb7da1e387e31ce54f54af580c6a6f512ca6 Mon Sep 17 00:00:00 2001
From: Sascha Hauer <[email protected]>
Date: Tue, 26 Feb 2013 10:55:18 +0100
Subject: ARM: i.MX35: enable MAX clock
From: Sascha Hauer <[email protected]>
commit 5dc2eb7da1e387e31ce54f54af580c6a6f512ca6 upstream.
The i.MX35 has two bits per clock gate which are decoded as follows:
0b00 -> clock off
0b01 -> clock is on in run mode, off in wait/doze
0b10 -> clock is on in run/wait mode, off in doze
0b11 -> clock is always on
The reset value for the MAX clock is 0b10.
The MAX clock is needed by the SoC, yet unused in the Kernel, so the
common clock framework will disable it during late init time. It will
only disable clocks though which it detects as being turned on. This
detection is made depending on the lower bit of the gate. If the reset
value has been altered by the bootloader to 0b11 the clock framework
will detect the clock as turned on, yet unused, hence it will turn it
off and the system locks up.
This patch turns the MAX clock on unconditionally making the Kernel
independent of the bootloader.
Signed-off-by: Sascha Hauer <[email protected]>
Cc: Lingzhu Xiang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm/mach-imx/clk-imx35.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/arm/mach-imx/clk-imx35.c
+++ b/arch/arm/mach-imx/clk-imx35.c
@@ -265,6 +265,7 @@ int __init mx35_clocks_init()
clk_prepare_enable(clk[gpio3_gate]);
clk_prepare_enable(clk[iim_gate]);
clk_prepare_enable(clk[emi_gate]);
+ clk_prepare_enable(clk[max_gate]);
/*
* SCC is needed to boot via mmc after a watchdog reset. The clock code
Patches currently in stable-queue which might be from [email protected] are
queue-3.8/arm-clk-imx35-bugfix-iomux-clock.patch
queue-3.8/arm-i.mx35-enable-max-clock.patch
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