PM: EM: Fix incorrect description of the cost field in struct em_perf_state

[ Upstream commit 54b603f2db6b95495bc33a8f2bde80f044baff9a ]

Due to commit 1b600da51073 ("PM: EM: Optimize em_cpu_energy() and remove
division"), the logic for energy consumption calculation has been modified.
The actual calculation of cost is 10 * power * max_frequency / frequency
instead of power * max_frequency / frequency.

Therefore, the comment for cost has been updated to reflect the correct
content.

Fixes: 1b600da51073 ("PM: EM: Optimize em_cpu_energy() and remove division")
Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
[ rjw: Added Fixes: tag ]
Link: https://patch.msgid.link/20251230061534.816894-1-tianyaxiong@kylinos.cn
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/linux/energy_model.h b/include/linux/energy_model.h
index 34498652f780270c71a383aae2c6b0d635a8f883..09ce3dc4eab5c91b6b8c3df76280fc7bf048de52 100644 (file)
--- a/include/linux/energy_model.h
+++ b/include/linux/energy_model.h
@@ -18,7 +18,7 @@
  * @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
+ *             energy calculation. Equal to: 10 * power * max_frequency / frequency
  * @flags:     see "em_perf_state flags" description below.
  */
 struct em_perf_state {