reset: sti: rely on regmap_field_read_poll_timeout for ack wait

Use regmap_field_read_poll_timeout function when waiting for the
ack bit upon performing the reset control.

Signed-off-by: Alain Volmat <avolmat@me.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Link: https://lore.kernel.org/r/20230210224332.98482-1-avolmat@me.com
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

Author: Alain Volmat

drivers/reset/sti/reset-syscfg.c

@@ -64,22 +64,12 @@ static int syscfg_reset_program_hw(struct reset_controller_dev *rcdev,
 		return err;
 
 	if (ch->ack) {
-		unsigned long timeout = jiffies + msecs_to_jiffies(1000);
 		u32 ack_val;
 
-		while (true) {
-			err = regmap_field_read(ch->ack, &ack_val);
-			if (err)
-				return err;
-
-			if (ack_val == ctrl_val)
-				break;
-
-			if (time_after(jiffies, timeout))
-				return -ETIME;
-
-			cpu_relax();
-		}
+		err = regmap_field_read_poll_timeout(ch->ack, ack_val, (ack_val == ctrl_val),
+						     100, USEC_PER_SEC);
+		if (err)
+			return err;
 	}
 
 	return 0;