thermal: devfreq_cooling: Fix perf state when calculate dfc res_util

The issue occurs when the devfreq cooling device uses the EM power model
and the get_real_power() callback is provided by the driver.

The EM power table is sorted ascending，can't index the table by cooling
device state，so convert cooling state to performance state by
dfc->max_state - dfc->capped_state.

Fixes: 615510f ("thermal: devfreq_cooling: remove old power model and use EM")
Cc: 5.11+ <[email protected]> # 5.11+
Signed-off-by: Ye Zhang <[email protected]>
Reviewed-by: Dhruva Gole <[email protected]>
Reviewed-by: Lukasz Luba <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: Ye Zhang

drivers/thermal/devfreq_cooling.c

@@ -214,7 +214,7 @@ static int devfreq_cooling_get_requested_power(struct thermal_cooling_device *cd
 
 		res = dfc->power_ops->get_real_power(df, power, freq, voltage);
 		if (!res) {
-			state = dfc->capped_state;
+			state = dfc->max_state - dfc->capped_state;
 
 			/* Convert EM power into milli-Watts first */
 			rcu_read_lock();