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>
11 #include <linux/slab.h>
13 #include <drm/drm_bridge.h>
14 #include <drm/drm_bridge_connector.h>
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_managed.h>
17 #include <drm/drm_modeset_helper_vtables.h>
18 #include <drm/drm_panel.h>
20 #include "rcar_du_drv.h"
21 #include "rcar_du_encoder.h"
22 #include "rcar_du_kms.h"
23 #include "rcar_lvds.h"
25 /* -----------------------------------------------------------------------------
29 static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
31 struct device_node *ports;
32 struct device_node *port;
33 unsigned int num_ports = 0;
35 ports = of_get_child_by_name(node, "ports");
37 ports = of_node_get(node);
39 for_each_child_of_node(ports, port) {
40 if (of_node_name_eq(port, "port"))
49 static const struct drm_encoder_funcs rcar_du_encoder_funcs = {
52 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
53 enum rcar_du_output output,
54 struct device_node *enc_node)
56 struct rcar_du_encoder *renc;
57 struct drm_connector *connector;
58 struct drm_bridge *bridge;
62 * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
63 * DT node has a single port, assume that it describes a panel and
64 * create a panel bridge.
66 if ((output == RCAR_DU_OUTPUT_DPAD0 ||
67 output == RCAR_DU_OUTPUT_DPAD1) &&
68 rcar_du_encoder_count_ports(enc_node) == 1) {
69 struct drm_panel *panel = of_drm_find_panel(enc_node);
72 return PTR_ERR(panel);
74 bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
75 DRM_MODE_CONNECTOR_DPI);
77 return PTR_ERR(bridge);
79 bridge = of_drm_find_bridge(enc_node);
83 if (output == RCAR_DU_OUTPUT_LVDS0 ||
84 output == RCAR_DU_OUTPUT_LVDS1)
85 rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
89 * Create and initialize the encoder. On Gen3, skip the LVDS1 output if
90 * the LVDS1 encoder is used as a companion for LVDS0 in dual-link
91 * mode, or any LVDS output if it isn't connected. The latter may happen
92 * on D3 or E3 as the LVDS encoders are needed to provide the pixel
93 * clock to the DU, even when the LVDS outputs are not used.
95 if (rcdu->info->gen >= 3) {
96 if (output == RCAR_DU_OUTPUT_LVDS1 &&
97 rcar_lvds_dual_link(bridge))
100 if ((output == RCAR_DU_OUTPUT_LVDS0 ||
101 output == RCAR_DU_OUTPUT_LVDS1) &&
102 !rcar_lvds_is_connected(bridge))
106 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %s\n",
107 enc_node, rcar_du_output_name(output));
109 renc = drmm_encoder_alloc(&rcdu->ddev, struct rcar_du_encoder, base,
110 &rcar_du_encoder_funcs, DRM_MODE_ENCODER_NONE,
115 renc->output = output;
117 /* Attach the bridge to the encoder. */
118 ret = drm_bridge_attach(&renc->base, bridge, NULL,
119 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
122 "failed to attach bridge %pOF for output %s (%d)\n",
123 bridge->of_node, rcar_du_output_name(output), ret);
127 /* Create the connector for the chain of bridges. */
128 connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
129 if (IS_ERR(connector)) {
131 "failed to created connector for output %s (%ld)\n",
132 rcar_du_output_name(output), PTR_ERR(connector));
133 return PTR_ERR(connector);
136 return drm_connector_attach_encoder(connector, &renc->base);