Commit 60641029 authored by Liu Ying's avatar Liu Ying Committed by Dmitry Baryshkov
Browse files

drm: of: Add drm_of_lvds_get_dual_link_pixel_order_sink() 



drm_of_lvds_get_dual_link_pixel_order() gets LVDS dual-link source pixel
order.  Similar to it, add it's counterpart function
drm_of_lvds_get_dual_link_pixel_order_sink() to get LVDS dual-link sink
pixel order.

Suggested-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: default avatarLiu Ying <victor.liu@nxp.com>
Reviewed-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20241104032806.611890-7-victor.liu@nxp.com


Signed-off-by: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
parent 34902c2d

drivers/gpu/drm/drm_of.c

+65 −11
Original line number Diff line number Diff line
@@ -341,8 +341,23 @@ static int drm_of_lvds_get_remote_pixels_type( 
	return pixels_type;

}



static int __drm_of_lvds_get_dual_link_pixel_order(int p1_pt, int p2_pt)

{

	/*

	 * A valid dual-lVDS bus is found when one port is marked with

	 * "dual-lvds-even-pixels", and the other port is marked with

	 * "dual-lvds-odd-pixels", bail out if the markers are not right.

	 */

	if (p1_pt + p2_pt != DRM_OF_LVDS_EVEN + DRM_OF_LVDS_ODD)

		return -EINVAL;



	return p1_pt == DRM_OF_LVDS_EVEN ?

		DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS :

		DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;

}



/**

 * drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link pixel order

 * drm_of_lvds_get_dual_link_pixel_order - Get LVDS dual-link source pixel order

 * @port1: First DT port node of the Dual-link LVDS source

 * @port2: Second DT port node of the Dual-link LVDS source

 *
@@ -387,19 +402,58 @@ int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1, 
	if (remote_p2_pt < 0)

		return remote_p2_pt;



	/*

	 * A valid dual-lVDS bus is found when one remote port is marked with

	 * "dual-lvds-even-pixels", and the other remote port is marked with

	 * "dual-lvds-odd-pixels", bail out if the markers are not right.

	return __drm_of_lvds_get_dual_link_pixel_order(remote_p1_pt, remote_p2_pt);

}

EXPORT_SYMBOL_GPL(drm_of_lvds_get_dual_link_pixel_order);



/**

 * drm_of_lvds_get_dual_link_pixel_order_sink - Get LVDS dual-link sink pixel order

 * @port1: First DT port node of the Dual-link LVDS sink

 * @port2: Second DT port node of the Dual-link LVDS sink

 *

 * An LVDS dual-link connection is made of two links, with even pixels

 * transitting on one link, and odd pixels on the other link. This function

 * returns, for two ports of an LVDS dual-link sink, which port shall transmit

 * the even and odd pixels, based on the requirements of the sink.

 *

 * The pixel order is determined from the dual-lvds-even-pixels and

 * dual-lvds-odd-pixels properties in the sink's DT port nodes. If those

 * properties are not present, or if their usage is not valid, this function

 * returns -EINVAL.

 *

 * If either port is not connected, this function returns -EPIPE.

 *

 * @port1 and @port2 are typically DT sibling nodes, but may have different

 * parents when, for instance, two separate LVDS decoders receive the even and

 * odd pixels.

 *

 * Return:

 * * DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS - @port1 receives even pixels and @port2

 *   receives odd pixels

 * * DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS - @port1 receives odd pixels and @port2

 *   receives even pixels

 * * -EINVAL - @port1 or @port2 are NULL

 * * -EPIPE - when @port1 or @port2 are not connected

 */

	if (remote_p1_pt + remote_p2_pt != DRM_OF_LVDS_EVEN + DRM_OF_LVDS_ODD)

int drm_of_lvds_get_dual_link_pixel_order_sink(struct device_node *port1,

					       struct device_node *port2)

{

	int sink_p1_pt, sink_p2_pt;



	if (!port1 || !port2)

		return -EINVAL;



	return remote_p1_pt == DRM_OF_LVDS_EVEN ?

		DRM_LVDS_DUAL_LINK_EVEN_ODD_PIXELS :

		DRM_LVDS_DUAL_LINK_ODD_EVEN_PIXELS;

	sink_p1_pt = drm_of_lvds_get_port_pixels_type(port1);

	if (!sink_p1_pt)

		return -EPIPE;



	sink_p2_pt = drm_of_lvds_get_port_pixels_type(port2);

	if (!sink_p2_pt)

		return -EPIPE;



	return __drm_of_lvds_get_dual_link_pixel_order(sink_p1_pt, sink_p2_pt);

}

EXPORT_SYMBOL_GPL(drm_of_lvds_get_dual_link_pixel_order);

EXPORT_SYMBOL_GPL(drm_of_lvds_get_dual_link_pixel_order_sink);



/**

 * drm_of_lvds_get_data_mapping - Get LVDS data mapping

include/drm/drm_of.h

+9 −0
Original line number Diff line number Diff line
@@ -52,6 +52,8 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, 
				struct drm_bridge **bridge);

int drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1,

					  const struct device_node *port2);

int drm_of_lvds_get_dual_link_pixel_order_sink(struct device_node *port1,

					       struct device_node *port2);

int drm_of_lvds_get_data_mapping(const struct device_node *port);

int drm_of_get_data_lanes_count(const struct device_node *endpoint,

				const unsigned int min, const unsigned int max);
@@ -109,6 +111,13 @@ drm_of_lvds_get_dual_link_pixel_order(const struct device_node *port1, 
	return -EINVAL;

}



static inline int

drm_of_lvds_get_dual_link_pixel_order_sink(struct device_node *port1,

					   struct device_node *port2)

{

	return -EINVAL;

}



static inline int

drm_of_lvds_get_data_mapping(const struct device_node *port)

{