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cpuidle: poll_state: Disregard disable idle states 

When computing the limit of time to spend in the loop in poll_idle(),
use the target residency of the first enabled idle state deeper than
state 0 instead of always using the target residency of state 1.

This helps when state 1 is disabled for diagnostics, for instance.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2018-12-03 13:32:53 +01:00
parent aa5eee355b
commit 800fb34a99
1 changed files with 10 additions and 1 deletions
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11
drivers/cpuidle/poll_state.c
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@ -20,8 +20,17 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
local_irq_enable(); local_irq_enable();
if (!current_set_polling_and_test()) { if (!current_set_polling_and_test()) {
u64 limit = (u64)drv->states[1].target_residency * NSEC_PER_USEC;
unsigned int loop_count = 0; unsigned int loop_count = 0;
u64 limit = TICK_USEC;
int i;
for (i = 1; i < drv->state_count; i++) {
if (drv->states[i].disabled || dev->states_usage[i].disable)
continue;
limit = (u64)drv->states[i].target_residency * NSEC_PER_USEC;
break;
}
while (!need_resched()) { while (!need_resched()) {
cpu_relax(); cpu_relax();