diff --git a/drivers/iio/adc/aspeed_adc.c b/drivers/iio/adc/aspeed_adc.c
index 3ff24474f394..a1a6296d3003 100644
--- a/drivers/iio/adc/aspeed_adc.c
+++ b/drivers/iio/adc/aspeed_adc.c
@@ -259,7 +259,7 @@ static int aspeed_adc_compensation(struct iio_dev *indio_dev)
 	 * After enable compensating sensing mode need to wait some time for ADC stable
 	 * Experiment result is 1ms.
 	 */
-	mdelay(1);
+	fsleep(1000);
 
 	for (index = 0; index < 16; index++) {
 		/*
@@ -314,10 +314,10 @@ static int aspeed_adc_read_raw(struct iio_dev *indio_dev,
 				       ASPEED_ADC_BAT_SENSING_ENABLE,
 			       data->base + ASPEED_REG_ENGINE_CONTROL);
 			/*
-			 * After enable battery sensing mode need to wait some time for adc stable
+			 * After enable battery sensing mode need to wait some time for ADC stable
 			 * Experiment result is 1ms.
 			 */
-			mdelay(1);
+			fsleep(1000);
 			*val = readw(data->base + chan->address);
 			*val = (*val * data->battery_mode_gain.mult) /
 			       data->battery_mode_gain.div;