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thermal: gov_power_allocator: Granted power set to max when nobody request power

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When total_req_power is 0, divvy_up_power() will set granted_power to 0,
and cdev will be limited to the lowest performance. If our polling delay
is set to 200ms, it means that cdev cannot perform better within 200ms
even if cdev has a sudden load. This will affect the performance of cdev
and is not as expected.

For this reason, if nobody requests power, then set the granted power to
the max_power.

Signed-off-by: ZhengShaobo <zhengshaobo1@xiaomi.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/20241021121138.422-1-zhengshaobo1@xiaomi.com
[ rjw: Fixed up tags ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
ZhengShaobo 2024-10-21 20:11:38 +08:00 committed by Rafael J. Wysocki
parent 43bac1026f
commit 08eb0493f6
1 changed files with 13 additions and 5 deletions
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18
drivers/thermal/gov_power_allocator.c
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@ -354,11 +354,19 @@ static void divvy_up_power(struct power_actor *power, int num_actors,
u32 extra_power = 0;
int i;
/*
* Prevent division by 0 if none of the actors request power.
*/
if (!total_req_power)
total_req_power = 1;
if (!total_req_power) {
/*
* Nobody requested anything, just give everybody
* the maximum power
*/
for (i = 0; i < num_actors; i++) {
struct power_actor *pa = &power[i];
pa->granted_power = pa->max_power;
}
return;
}
for (i = 0; i < num_actors; i++) {
struct power_actor *pa = &power[i];