This is a note to let you know that I've just added the patch titled
cpufreq: st: enable selective initialization based on the platform
to the 4.5-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:
cpufreq-st-enable-selective-initialization-based-on-the-platform.patch
and it can be found in the queue-4.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2482bc31ca8096241b8fa97610ef23154ce55f45 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <Sudeep.Holla@xxxxxxx>
Date: Wed, 27 Apr 2016 17:18:59 +0100
Subject: cpufreq: st: enable selective initialization based on the platform
From: Sudeep Holla <Sudeep.Holla@xxxxxxx>
commit 2482bc31ca8096241b8fa97610ef23154ce55f45 upstream.
The sti-cpufreq does unconditional registration of the cpufreq-dt driver
which causes issue on an multi-platform build. For example, on Vexpress
TC2 platform, we get the following error on boot:
cpu cpu0: OPP-v2 not supported
cpu cpu0: Not doing voltage scaling
cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table
for cpu:0, -19
cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6)
...
arm_big_little: bL_cpufreq_register: Failed registering platform driver:
vexpress-spc, err: -17
The actual driver fails to initialise as cpufreq-dt is probed
successfully, which is incorrect. This issue can happen to any platform
not using cpufreq-dt in a multi-platform build.
This patch adds a check to do selective initialization of the driver.
Fixes: ab0ea257fc58 (cpufreq: st: Provide runtime initialised driver for ST's platforms)
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/sti-cpufreq.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/cpufreq/sti-cpufreq.c
+++ b/drivers/cpufreq/sti-cpufreq.c
@@ -259,6 +259,10 @@ static int sti_cpufreq_init(void)
{
int ret;
+ if ((!of_machine_is_compatible("st,stih407")) &&
+ (!of_machine_is_compatible("st,stih410")))
+ return -ENODEV;
+
ddata.cpu = get_cpu_device(0);
if (!ddata.cpu) {
dev_err(ddata.cpu, "Failed to get device for CPU0\n");
Patches currently in stable-queue which might be from Sudeep.Holla@xxxxxxx are
queue-4.5/cpufreq-st-enable-selective-initialization-based-on-the-platform.patch
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