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>
16 #include <drm/drm_simple_kms_helper.h>
18 #include "rcar_du_drv.h"
19 #include "rcar_du_encoder.h"
20 #include "rcar_du_kms.h"
21 #include "rcar_lvds.h"
23 /* -----------------------------------------------------------------------------
27 static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
29 struct device_node *ports;
30 struct device_node *port;
31 unsigned int num_ports = 0;
33 ports = of_get_child_by_name(node, "ports");
35 ports = of_node_get(node);
37 for_each_child_of_node(ports, port) {
38 if (of_node_name_eq(port, "port"))
47 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
48 enum rcar_du_output output,
49 struct device_node *enc_node)
51 struct rcar_du_encoder *renc;
52 struct drm_encoder *encoder;
53 struct drm_bridge *bridge;
56 renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
60 renc->output = output;
61 encoder = rcar_encoder_to_drm_encoder(renc);
63 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
67 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
68 * DT node has a single port, assume that it describes a panel and
69 * create a panel bridge.
71 if ((output == RCAR_DU_OUTPUT_DPAD0 ||
72 output == RCAR_DU_OUTPUT_DPAD1) &&
73 rcar_du_encoder_count_ports(enc_node) == 1) {
74 struct drm_panel *panel = of_drm_find_panel(enc_node);
81 bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
82 DRM_MODE_CONNECTOR_DPI);
84 ret = PTR_ERR(bridge);
88 bridge = of_drm_find_bridge(enc_node);
94 if (output == RCAR_DU_OUTPUT_LVDS0 ||
95 output == RCAR_DU_OUTPUT_LVDS1)
96 rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
100 * On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
101 * companion for LVDS0 in dual-link mode.
103 if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
104 if (rcar_lvds_dual_link(bridge)) {
110 ret = drm_simple_encoder_init(rcdu->ddev, encoder,
111 DRM_MODE_ENCODER_NONE);
116 * Attach the bridge to the encoder. The bridge will create the
119 ret = drm_bridge_attach(encoder, bridge, NULL, 0);
121 drm_encoder_cleanup(encoder);
128 encoder->funcs->destroy(encoder);
129 devm_kfree(rcdu->dev, renc);