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/ --- 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 66a9c23544db..09582696b83d 100644 --- a/drivers/cpufreq/tegra194-cpufreq.c +++ b/drivers/cpufreq/tegra194-cpufreq.c @@ -510,6 +510,21 @@ 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_exit(struct cpufreq_policy *policy) { struct device *cpu_dev = get_cpu_device(policy->cpu); @@ -548,6 +563,8 @@ static struct cpufreq_driver tegra194_cpufreq_driver = { .get = tegra194_get_speed, .init = tegra194_cpufreq_init, .exit = tegra194_cpufreq_exit, + .online = tegra194_cpufreq_online, + .offline = tegra194_cpufreq_offline, .attr = cpufreq_generic_attr, }; -- 2.17.1
