diff --git a/drivers/gpu/drm/display/drm_dp_cec.c b/drivers/gpu/drm/display/drm_dp_cec.c
index 007ceb281d00da65f5b4957cb8be66c2ea25d4e4..237f9a6a8077c62ff562d8f2d04cab3f079ed367 100644
--- a/drivers/gpu/drm/display/drm_dp_cec.c
+++ b/drivers/gpu/drm/display/drm_dp_cec.c
@@ -96,7 +96,7 @@ static int drm_dp_cec_adap_enable(struct cec_adapter *adap, bool enable)
 	u32 val = enable ? DP_CEC_TUNNELING_ENABLE : 0;
 	ssize_t err = 0;
 
-	err = drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_CONTROL, val);
+	err = drm_dp_dpcd_write_byte(aux, DP_CEC_TUNNELING_CONTROL, val);
 	return (enable && err < 0) ? err : 0;
 }
 
@@ -112,7 +112,7 @@ static int drm_dp_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
 		la_mask |= adap->log_addrs.log_addr_mask | (1 << addr);
 	mask[0] = la_mask & 0xff;
 	mask[1] = la_mask >> 8;
-	err = drm_dp_dpcd_write(aux, DP_CEC_LOGICAL_ADDRESS_MASK, mask, 2);
+	err = drm_dp_dpcd_write_data(aux, DP_CEC_LOGICAL_ADDRESS_MASK, mask, 2);
 	return (addr != CEC_LOG_ADDR_INVALID && err < 0) ? err : 0;
 }
 
@@ -123,15 +123,14 @@ static int drm_dp_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
 	unsigned int retries = min(5, attempts - 1);
 	ssize_t err;
 
-	err = drm_dp_dpcd_write(aux, DP_CEC_TX_MESSAGE_BUFFER,
-				msg->msg, msg->len);
+	err = drm_dp_dpcd_write_data(aux, DP_CEC_TX_MESSAGE_BUFFER,
+				     msg->msg, msg->len);
 	if (err < 0)
 		return err;
 
-	err = drm_dp_dpcd_writeb(aux, DP_CEC_TX_MESSAGE_INFO,
-				 (msg->len - 1) | (retries << 4) |
-				 DP_CEC_TX_MESSAGE_SEND);
-	return err < 0 ? err : 0;
+	return drm_dp_dpcd_write_byte(aux, DP_CEC_TX_MESSAGE_INFO,
+				      (msg->len - 1) | (retries << 4) |
+				      DP_CEC_TX_MESSAGE_SEND);
 }
 
 static int drm_dp_cec_adap_monitor_all_enable(struct cec_adapter *adap,
@@ -144,13 +143,13 @@ static int drm_dp_cec_adap_monitor_all_enable(struct cec_adapter *adap,
 	if (!(adap->capabilities & CEC_CAP_MONITOR_ALL))
 		return 0;
 
-	err = drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_CONTROL, &val);
-	if (err >= 0) {
+	err = drm_dp_dpcd_read_byte(aux, DP_CEC_TUNNELING_CONTROL, &val);
+	if (!err) {
 		if (enable)
 			val |= DP_CEC_SNOOPING_ENABLE;
 		else
 			val &= ~DP_CEC_SNOOPING_ENABLE;
-		err = drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_CONTROL, val);
+		err = drm_dp_dpcd_write_byte(aux, DP_CEC_TUNNELING_CONTROL, val);
 	}
 	return (enable && err < 0) ? err : 0;
 }
@@ -194,7 +193,7 @@ static int drm_dp_cec_received(struct drm_dp_aux *aux)
 	u8 rx_msg_info;
 	ssize_t err;
 
-	err = drm_dp_dpcd_readb(aux, DP_CEC_RX_MESSAGE_INFO, &rx_msg_info);
+	err = drm_dp_dpcd_read_byte(aux, DP_CEC_RX_MESSAGE_INFO, &rx_msg_info);
 	if (err < 0)
 		return err;
 
@@ -202,7 +201,7 @@ static int drm_dp_cec_received(struct drm_dp_aux *aux)
 		return 0;
 
 	msg.len = (rx_msg_info & DP_CEC_RX_MESSAGE_LEN_MASK) + 1;
-	err = drm_dp_dpcd_read(aux, DP_CEC_RX_MESSAGE_BUFFER, msg.msg, msg.len);
+	err = drm_dp_dpcd_read_data(aux, DP_CEC_RX_MESSAGE_BUFFER, msg.msg, msg.len);
 	if (err < 0)
 		return err;
 
@@ -215,7 +214,7 @@ static void drm_dp_cec_handle_irq(struct drm_dp_aux *aux)
 	struct cec_adapter *adap = aux->cec.adap;
 	u8 flags;
 
-	if (drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_IRQ_FLAGS, &flags) < 0)
+	if (drm_dp_dpcd_read_byte(aux, DP_CEC_TUNNELING_IRQ_FLAGS, &flags) < 0)
 		return;
 
 	if (flags & DP_CEC_RX_MESSAGE_INFO_VALID)
@@ -230,7 +229,7 @@ static void drm_dp_cec_handle_irq(struct drm_dp_aux *aux)
 		 (DP_CEC_TX_ADDRESS_NACK_ERROR | DP_CEC_TX_DATA_NACK_ERROR))
 		cec_transmit_attempt_done(adap, CEC_TX_STATUS_NACK |
 						CEC_TX_STATUS_MAX_RETRIES);
-	drm_dp_dpcd_writeb(aux, DP_CEC_TUNNELING_IRQ_FLAGS, flags);
+	drm_dp_dpcd_write_byte(aux, DP_CEC_TUNNELING_IRQ_FLAGS, flags);
 }
 
 /**
@@ -253,13 +252,13 @@ void drm_dp_cec_irq(struct drm_dp_aux *aux)
 	if (!aux->cec.adap)
 		goto unlock;
 
-	ret = drm_dp_dpcd_readb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1,
-				&cec_irq);
+	ret = drm_dp_dpcd_read_byte(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1,
+				    &cec_irq);
 	if (ret < 0 || !(cec_irq & DP_CEC_IRQ))
 		goto unlock;
 
 	drm_dp_cec_handle_irq(aux);
-	drm_dp_dpcd_writeb(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1, DP_CEC_IRQ);
+	drm_dp_dpcd_write_byte(aux, DP_DEVICE_SERVICE_IRQ_VECTOR_ESI1, DP_CEC_IRQ);
 unlock:
 	mutex_unlock(&aux->cec.lock);
 }
@@ -269,7 +268,7 @@ static bool drm_dp_cec_cap(struct drm_dp_aux *aux, u8 *cec_cap)
 {
 	u8 cap = 0;
 
-	if (drm_dp_dpcd_readb(aux, DP_CEC_TUNNELING_CAPABILITY, &cap) != 1 ||
+	if (drm_dp_dpcd_read_byte(aux, DP_CEC_TUNNELING_CAPABILITY, &cap) < 0 ||
 	    !(cap & DP_CEC_TUNNELING_CAPABLE))
 		return false;
 	if (cec_cap)
