This is a note to let you know that I've just added the patch titled
ARM: integrator: deactivate timer0 on the Integrator/CP
to the 3.11-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-integrator-deactivate-timer0-on-the-integrator-cp.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 29114fd7db2fc82a34da8340d29b8fa413e03dca Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date: Mon, 7 Oct 2013 15:19:53 +0200
Subject: ARM: integrator: deactivate timer0 on the Integrator/CP
From: Linus Walleij <linus.walleij@xxxxxxxxxx>
commit 29114fd7db2fc82a34da8340d29b8fa413e03dca upstream.
This fixes a long-standing Integrator/CP regression from
commit 870e2928cf3368ca9b06bc925d0027b0a56bcd8e
"ARM: integrator-cp: convert use CLKSRC_OF for timer init"
When this code was introduced, the both aliases pointing the
system to use timer1 as primary (clocksource) and timer2
as secondary (clockevent) was ignored, and the system would
simply use the first two timers found as clocksource and
clockevent.
However this made the system timeline accelerate by a
factor x25, as it turns out that the way the clocking
actually works (totally undocumented and found after some
trial-and-error) is that timer0 runs @ 25MHz and timer1
and timer2 runs @ 1MHz. Presumably this divider setting
is a boot-on default and configurable albeit the way to
configure it is not documented.
So as a quick fix to the problem, let's mark timer0 as
disabled, so the code will chose timer1 and timer2 as it
used to.
This also deletes the two aliases for the primary and
secondary timer as they have been superceded by the
auto-selection
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Olof Johansson <olof@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/boot/dts/integratorcp.dts | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
--- a/arch/arm/boot/dts/integratorcp.dts
+++ b/arch/arm/boot/dts/integratorcp.dts
@@ -9,11 +9,6 @@
model = "ARM Integrator/CP";
compatible = "arm,integrator-cp";
- aliases {
- arm,timer-primary = &timer2;
- arm,timer-secondary = &timer1;
- };
-
chosen {
bootargs = "root=/dev/ram0 console=ttyAMA0,38400n8 earlyprintk";
};
@@ -24,14 +19,18 @@
};
timer0: timer@13000000 {
+ /* TIMER0 runs @ 25MHz */
compatible = "arm,integrator-cp-timer";
+ status = "disabled";
};
timer1: timer@13000100 {
+ /* TIMER1 runs @ 1MHz */
compatible = "arm,integrator-cp-timer";
};
timer2: timer@13000200 {
+ /* TIMER2 runs @ 1MHz */
compatible = "arm,integrator-cp-timer";
};
Patches currently in stable-queue which might be from linus.walleij@xxxxxxxxxx are
queue-3.11/gpio-lynxpoint-check-if-the-interrupt-is-enabled-in-irq-handler.patch
queue-3.11/arm-integrator-deactivate-timer0-on-the-integrator-cp.patch
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