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PM: EM: Force device drivers to provide power in uW

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The EM only supports power in uW. Make sure that it is not possible to
register some downstream driver which doesn't provide power in uW.
The only exception is artificial EM, but that EM is ignored by the rest of
kernel frameworks (thermal, powercap, etc).

Reported-by: PoShao Chen <poshao.chen@mediatek.com>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2024-03-08 12:32:03 +00:00 committed by Rafael J. Wysocki
parent 07abb19a9b
commit 3acec69a94
1 changed files with 11 additions and 0 deletions
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11
kernel/power/energy_model.c
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@ -612,6 +612,17 @@ int em_dev_register_perf_domain(struct device *dev, unsigned int nr_states,
else if (cb->get_cost)
flags |= EM_PERF_DOMAIN_ARTIFICIAL;
/*
* EM only supports uW (exception is artificial EM).
* Therefore, check and force the drivers to provide
* power in uW.
*/
if (!microwatts && !(flags & EM_PERF_DOMAIN_ARTIFICIAL)) {
dev_err(dev, "EM: only supports uW power values\n");
ret = -EINVAL;
goto unlock;
}
ret = em_create_pd(dev, nr_states, cb, cpus, flags);
if (ret)
goto unlock;