schedutil: Allow CPU frequency changes to be amended before they're set

If the last CPU frequency selected isn't set before a new CPU frequency
selection arrives, then use the new selection immediately to avoid using a
stale frequency choice. This improves both performance and energy by more
closely tracking the scheduler's latest decisions.

Signed-off-by: Sultan Alsawaf <[email protected]>
Signed-off-by: Tashfin Shakeer Rhythm <[email protected]>
Signed-off-by: NotZeetaa <[email protected]>

kernel/sched/cpufreq_schedutil.c

@@ -119,6 +119,10 @@ static bool sugov_should_update_freq(struct sugov_policy *sg_policy, u64 time)
 		return true;
 	}
 
+	/* If the last frequency wasn't set yet then we can still amend it */
+	if (sg_policy->work_in_progress)
+		return true;
+
 	/* No need to recalculate next freq for min_rate_limit_us
 	 * at least. However we might still decide to further rate
 	 * limit once frequency change direction is decided, according