From: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx> cpuidle accounts the idle time for the C-state it was trying to enter and not to the actual state that the driver eventually entered. The driver may select a different state than the one chosen by cpuidle due to constraints like bus-mastering, etc. Change the time acounting code to look at the dev->last_state after returning from target_state->enter(). Driver can modify dev->last_state internally, inside the enter routine to reflect the actual C-state entered. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx> Tested-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Len Brown <len.brown@xxxxxxxxx> --- drivers/cpuidle/cpuidle.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 5ce07b5..eb2cade 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -67,8 +67,11 @@ static void cpuidle_idle_call(void) target_state = &dev->states[next_state]; /* enter the state and update stats */ - dev->last_residency = target_state->enter(dev, target_state); dev->last_state = target_state; + dev->last_residency = target_state->enter(dev, target_state); + if (dev->last_state) + target_state = dev->last_state; + target_state->time += (unsigned long long)dev->last_residency; target_state->usage++; -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
