media: atomisp: Rename __get_mipi_port() to atomisp_port_to_mipi_port()

Rename __get_mipi_port() to atomisp_port_to_mipi_port(), this is not a
private (not static) function so its name should be properly prefixed.

While at is also cleanup the weird handling of ATOMISP_CAMERA_PORT_TERTIARY
this seems to be a left over from when the driver also supported CSI
receivers with only 2 ports, but those are not supported by the current
code base, so this can be cleaned up now.

Link: https://lore.kernel.org/r/20230518153733.195306-5-hdegoede@redhat.comReviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

@@ -3893,7 +3893,7 @@ int atomisp_try_fmt(struct video_device *vdev, struct v4l2_pix_format *f)
 	return 0;
 }
 
-enum mipi_port_id __get_mipi_port(struct atomisp_device *isp,
+enum mipi_port_id atomisp_port_to_mipi_port(struct atomisp_device *isp,
 					    enum atomisp_camera_port port)
 {
 	switch (port) {
@@ -3902,9 +3902,7 @@ enum mipi_port_id __get_mipi_port(struct atomisp_device *isp,
 	case ATOMISP_CAMERA_PORT_SECONDARY:
 		return MIPI_PORT1_ID;
 	case ATOMISP_CAMERA_PORT_TERTIARY:
-		if (MIPI_PORT1_ID + 1 != N_MIPI_PORT_ID)
-			return MIPI_PORT1_ID + 1;
-		fallthrough;
+		return MIPI_PORT2_ID;
 	default:
 		dev_err(isp->dev, "unsupported port: %d\n", port);
 		return MIPI_PORT0_ID;
@@ -3980,7 +3978,7 @@ static inline int atomisp_set_sensor_mipi_to_isp(
 		return -EINVAL;
 	input_format = fc->atomisp_in_fmt;
 	atomisp_css_input_configure_port(asd,
-					 __get_mipi_port(asd->isp, mipi_info->port),
+					 atomisp_port_to_mipi_port(asd->isp, mipi_info->port),
 					 mipi_info->num_lanes,
 					 0xffff4, mipi_freq,
 					 input_format,

drivers/staging/media/atomisp/pci/atomisp_cmd.h

@@ -285,7 +285,7 @@ void atomisp_buf_done(struct atomisp_sub_device *asd, int error,
 /* Events. Only one event has to be exported for now. */
 void atomisp_eof_event(struct atomisp_sub_device *asd, uint8_t exp_id);
 
-enum mipi_port_id __get_mipi_port(struct atomisp_device *isp,
+enum mipi_port_id atomisp_port_to_mipi_port(struct atomisp_device *isp,
 					    enum atomisp_camera_port port);
 
 void atomisp_apply_css_parameters(