drm/i915: s/intel_dp_aux_ch/intel_dp_aux_xfer/

Rename intel_dp_aux_ch() to intel_dp_aux_xfer() to better convey
what it actually does.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180222181036.15251-6-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> #irc

drivers/gpu/drm/i915/intel_dp.c

@@ -1085,7 +1085,7 @@ static uint32_t intel_dp_get_aux_send_ctl(struct intel_dp *intel_dp,
 }
 
 static int
-intel_dp_aux_ch(struct intel_dp *intel_dp,
+intel_dp_aux_xfer(struct intel_dp *intel_dp,
 		  const uint8_t *send, int send_bytes,
 		  uint8_t *recv, int recv_size, bool aksv_write)
 {
@@ -1284,8 +1284,8 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 		if (msg->buffer)
 			memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
 
-		ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize,
-				      false);
+		ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
+					rxbuf, rxsize, false);
 		if (ret > 0) {
 			msg->reply = rxbuf[0] >> 4;
 
@@ -1307,8 +1307,8 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 		if (WARN_ON(rxsize > 20))
 			return -E2BIG;
 
-		ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize,
-				      false);
+		ret = intel_dp_aux_xfer(intel_dp, txbuf, txsize,
+					rxbuf, rxsize, false);
 		if (ret > 0) {
 			msg->reply = rxbuf[0] >> 4;
 			/*
@@ -5045,8 +5045,8 @@ int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *intel_dig_port,
 	txbuf[2] = DP_AUX_HDCP_AKSV & 0xff;
 	txbuf[3] = DRM_HDCP_KSV_LEN - 1;
 
-	ret = intel_dp_aux_ch(intel_dp, txbuf, sizeof(txbuf), rxbuf,
-			      sizeof(rxbuf), true);
+	ret = intel_dp_aux_xfer(intel_dp, txbuf, sizeof(txbuf),
+				rxbuf, sizeof(rxbuf), true);
 	if (ret < 0) {
 		DRM_ERROR("Write Aksv over DP/AUX failed (%d)\n", ret);
 		return ret;