1 // SPDX-License-Identifier: GPL-2.0+
3 * rcar_du_encoder.c -- R-Car Display Unit Encoder
5 * Copyright (C) 2013-2014 Renesas Electronics Corporation
7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
10 #include <linux/export.h>
12 #include <drm/drm_bridge.h>
13 #include <drm/drm_crtc.h>
14 #include <drm/drm_modeset_helper_vtables.h>
15 #include <drm/drm_panel.h>
17 #include "rcar_du_drv.h"
18 #include "rcar_du_encoder.h"
19 #include "rcar_du_kms.h"
20 #include "rcar_lvds.h"
22 /* -----------------------------------------------------------------------------
26 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
29 static const struct drm_encoder_funcs encoder_funcs = {
30 .destroy = drm_encoder_cleanup,
33 static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
35 struct device_node *ports;
36 struct device_node *port;
37 unsigned int num_ports = 0;
39 ports = of_get_child_by_name(node, "ports");
41 ports = of_node_get(node);
43 for_each_child_of_node(ports, port) {
44 if (of_node_name_eq(port, "port"))
53 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
54 enum rcar_du_output output,
55 struct device_node *enc_node)
57 struct rcar_du_encoder *renc;
58 struct drm_encoder *encoder;
59 struct drm_bridge *bridge;
62 renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
66 rcdu->encoders[output] = renc;
67 renc->output = output;
68 encoder = rcar_encoder_to_drm_encoder(renc);
70 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
74 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
75 * DT node has a single port, assume that it describes a panel and
76 * create a panel bridge.
78 if ((output == RCAR_DU_OUTPUT_DPAD0 ||
79 output == RCAR_DU_OUTPUT_DPAD1) &&
80 rcar_du_encoder_count_ports(enc_node) == 1) {
81 struct drm_panel *panel = of_drm_find_panel(enc_node);
88 bridge = devm_drm_panel_bridge_add(rcdu->dev, panel,
89 DRM_MODE_CONNECTOR_DPI);
91 ret = PTR_ERR(bridge);
95 bridge = of_drm_find_bridge(enc_node);
103 * On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
104 * companion for LVDS0 in dual-link mode.
106 if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
107 if (rcar_lvds_dual_link(bridge)) {
113 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
114 DRM_MODE_ENCODER_NONE, NULL);
118 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
121 * Attach the bridge to the encoder. The bridge will create the
124 ret = drm_bridge_attach(encoder, bridge, NULL);
126 drm_encoder_cleanup(encoder);
133 encoder->funcs->destroy(encoder);
134 devm_kfree(rcdu->dev, renc);