cpufreq: tegra194: add online/offline hooks

[ Upstream commit a3aa97b ] 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 <[email protected]> Signed-off-by: Sumit Gupta <[email protected]> Link: https://lore.kernel.org/lkml/20230816033402.3abmugb5goypvllm@vireshk-i7/ [ Viresh: Fixed rebase conflict ] Signed-off-by: Viresh Kumar <[email protected]> Stable-dep-of: de0e85b ("cpufreq: tegra194: remove opp table in exit hook") Signed-off-by: Sasha Levin <[email protected]>
chewitt · Sep 13, 2023 · 88dbf43 · 88dbf43
1 parent bf6b336
commit 88dbf43
Showing 1 changed file with 17 additions and 0 deletions.
diff --git 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,
 };