From a3aa97be69a7cc14ddc2bb0add0b9c51cb74bf83 Mon Sep 17 00:00:00 2001
From: Sumit Gupta <sumitg@nvidia.com>
Date: Fri, 25 Aug 2023 16:49:20 +0530
Subject: [PATCH] cpufreq: tegra194: add online/offline hooks
Git-commit: a3aa97be69a7cc14ddc2bb0add0b9c51cb74bf83
Patch-mainline: v6.6-rc1
References: git-fixes
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@linaro.org>
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Link: https://lore.kernel.org/lkml/20230816033402.3abmugb5goypvllm@vireshk-i7/
[ Viresh: Fixed rebase conflict ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/cpufreq/tegra194-cpufreq.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/cpufreq/tegra194-cpufreq.c b/drivers/cpufreq/tegra194-cpufreq.c
index c90b30469165..88df7e5a0573 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,
};
--
2.35.3