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PM: EM: update the comments related to power scale

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The Energy Model supports power values expressed in milli-Watts or in an
'abstract scale'. Update the related comments is the code to reflect that
state.

Reviewed-by: Quentin Perret <qperret@google.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 2020-11-03 09:05:59 +00:00 committed by Rafael J. Wysocki
parent 5a64f77569
commit f2c90b12e7
2 changed files with 6 additions and 7 deletions
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11
include/linux/energy_model.h
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@ -13,9 +13,8 @@
/**
* em_perf_state - Performance state of a performance domain
* @frequency: The frequency in KHz, for consistency with CPUFreq
* @power: The power consumed at this level, in milli-watts (by 1 CPU or
by a registered device). It can be a total power: static and
dynamic.
* @power: The power consumed at this level (by 1 CPU or by a registered
* device). It can be a total power: static and dynamic.
* @cost: The cost coefficient associated with this level, used during
* energy calculation. Equal to: power * max_frequency / frequency
*/
@ -58,7 +57,7 @@ struct em_data_callback {
/**
* active_power() - Provide power at the next performance state of
* a device
* @power : Active power at the performance state in mW
* @power : Active power at the performance state
* (modified)
* @freq : Frequency at the performance state in kHz
* (modified)
@ -69,8 +68,8 @@ struct em_data_callback {
* and frequency.
*
* In case of CPUs, the power is the one of a single CPU in the domain,
* expressed in milli-watts. It is expected to fit in the
* [0, EM_MAX_POWER] range.
* expressed in milli-Watts or an abstract scale. It is expected to
* fit in the [0, EM_MAX_POWER] range.
*
* Return 0 on success.
*/

2
kernel/power/energy_model.c
View File

@ -143,7 +143,7 @@ static int em_create_perf_table(struct device *dev, struct em_perf_domain *pd,
/*
* The power returned by active_state() is expected to be
* positive, in milli-watts and to fit into 16 bits.
* positive and to fit into 16 bits.
*/
if (!power || power > EM_MAX_POWER) {
dev_err(dev, "EM: invalid power: %lu\n",