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cpufreq: tegra194: add online/offline hooks

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[ Upstream commit a3aa97be69 ]

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: de0e85b29e ("cpufreq: tegra194: remove opp table in exit hook")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sumit Gupta 2023-08-25 16:49:20 +05:30 committed by Greg Kroah-Hartman
parent bf6b336cf2
commit 88dbf430b6
1 changed files with 17 additions and 0 deletions
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17
drivers/cpufreq/tegra194-cpufreq.c
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@ -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,
};