Use stopwatch_wait_until_expired where applicable

Change-Id: I4d6c6810b91294a7e401a4a1a446218c04c98e55
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/21590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>

src/drivers/i2c/rx6110sa/rx6110sa.c

@@ -149,8 +149,7 @@ static void rx6110sa_init(struct device *dev)
 	 * Take the needed delay after a reset sequence into account before the
 	 * VLF-bit can be cleared.
 	 */
-	while (!stopwatch_expired(&sw))
+	stopwatch_wait_until_expired(&sw);
-		;
 	flags &= ~VLF_BIT;
 	rx6110sa_write(dev, FLAG_REGISTER, flags);
 

src/ec/google/chromeec/ec_spi.c

@@ -51,8 +51,9 @@ static int crosec_spi_io(size_t req_size, size_t resp_size, void *context)
 	struct spi_slave *slave = (struct spi_slave *)context;
 	int ret = 0;
 
-	while (!stopwatch_expired(&cs_cooldown_sw))
+	/* Wait minimum delay between CS assertions. */
-		/* Wait minimum delay between CS assertions. */;
+	stopwatch_wait_until_expired(&cs_cooldown_sw);
+
 	spi_claim_bus(slave);
 
 	 /* Allow EC to ramp up clock after being awaken.

src/lib/timer.c

@@ -34,7 +34,5 @@ void udelay(unsigned int usec)
 		return;
 
 	stopwatch_init_usecs_expire(&sw, usec);
-
+	stopwatch_wait_until_expired(&sw);
-	while (!stopwatch_expired(&sw))
-		;
 }

src/mainboard/google/oak/romstage.c

@@ -55,8 +55,7 @@ void main(void)
 	/* init memory */
 	mt_mem_init(get_sdram_config());
 
-	while (!stopwatch_expired(&sw))
+	stopwatch_wait_until_expired(&sw);
-		;
 
 	/* Set to maximum frequency */
 	if (board_id() + CONFIG_BOARD_ID_ADJUSTMENT < 5)

src/mainboard/siemens/mc_apl1/mainboard.c

@@ -165,8 +165,7 @@ static void wait_for_legacy_dev(void *unused)
 	stopwatch_init_msecs_expire(&sw, (legacy_delay - us_since_boot) / 1000);
 	printk(BIOS_NOTICE, "Wait remaining %d of %d us for legacy devices...",
 			legacy_delay - us_since_boot, legacy_delay);
-	while (!stopwatch_expired(&sw))
+	stopwatch_wait_until_expired(&sw);
-		;
 	printk(BIOS_NOTICE, "done!\n");
 }