ITE: soc/riscv/ite: policy: Add minimum residency time to enter sleep

Adding this condition will limit the minimum residency time to enter
sleep mode. This will fix tests in test\kernel\sleep\usleep.c causing
longer than expected test times due to going into sleep mode with no
time limit.

Signed-off-by: Tim Lin <[email protected]>

Author: GTLin08

soc/riscv/riscv-ite/common/policy.c

@@ -17,14 +17,22 @@ __weak const struct pm_state_info *pm_policy_next_state(uint8_t cpu, int32_t tic
 
 	for (int16_t i = (int16_t)num_cpu_states - 1; i >= 0; i--) {
 		const struct pm_state_info *state = &cpu_states[i];
+		uint32_t min_residency;
 
 		/* check if there is a lock on state + substate */
 		if (pm_policy_state_lock_is_active(
 			state->state, state->substate_id)) {
 			continue;
 		}
 
-		return state;
+		min_residency = k_us_to_ticks_ceil32(state->min_residency_us);
+		/*
+		 * The tick interval for the system to enter sleep mode needs
+		 * to be longer than or equal to the minimum residency.
+		 */
+		if (ticks >= min_residency) {
+			return state;
+		}
 	}
 
 	return NULL;