This is a note to let you know that I've just added the patch titled
cpufreq: tegra194: add online/offline hooks
to the 6.4-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-tegra194-add-online-offline-hooks.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e9a3bb3952076fd2ddb51d830838cac6f8d62fb5
Author: Sumit Gupta <sumitg@xxxxxxxxxx>
Date: Fri Aug 25 16:49:20 2023 +0530
cpufreq: tegra194: add online/offline hooks
[ Upstream commit a3aa97be69a7cc14ddc2bb0add0b9c51cb74bf83 ]
Implement the light-weight tear down and bring up helpers to reduce the
amount of work to do on CPU offline/online operation.
This change helps to make the hotplugging paths much faster.
Suggested-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Sumit Gupta <sumitg@xxxxxxxxxx>
Link: https://lore.kernel.org/lkml/20230816033402.3abmugb5goypvllm@vireshk-i7/
[ Viresh: Fixed rebase conflict ]
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Stable-dep-of: de0e85b29edf ("cpufreq: tegra194: remove opp table in exit hook")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c
index 36dad5ea59475..4f572eb7842f5 100644
--- a/drivers/cpufreq/tegra194-cpufreq.c
+++ b/drivers/cpufreq/tegra194-cpufreq.c
@@ -508,6 +508,21 @@ static int tegra194_cpufreq_init(struct cpufreq_policy *policy)
return 0;
}
+static int tegra194_cpufreq_online(struct cpufreq_policy *policy)
+{
+ /* We did light-weight tear down earlier, nothing to do here */
+ return 0;
+}
+
+static int tegra194_cpufreq_offline(struct cpufreq_policy *policy)
+{
+ /*
+ * Preserve policy->driver_data and don't free resources on light-weight
+ * tear down.
+ */
+ return 0;
+}
+
static int tegra194_cpufreq_set_target(struct cpufreq_policy *policy,
unsigned int index)
{
@@ -535,6 +550,8 @@ static struct cpufreq_driver tegra194_cpufreq_driver = {
.target_index = tegra194_cpufreq_set_target,
.get = tegra194_get_speed,
.init = tegra194_cpufreq_init,
+ .online = tegra194_cpufreq_online,
+ .offline = tegra194_cpufreq_offline,
.attr = cpufreq_generic_attr,
};
