6.5-stable review patch. If anyone has any objections, please let me know.
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From: Sumit Gupta sumitg@nvidia.com
[ 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@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 Stable-dep-of: de0e85b29edf ("cpufreq: tegra194: remove opp table in exit hook") Signed-off-by: Sasha Levin sashal@kernel.org --- 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 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, };