1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0+
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * rcar_du_encoder.c -- R-Car Display Unit Encoder
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2013-2014 Renesas Electronics Corporation
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/export.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <drm/drm_bridge.h>
13*4882a593Smuzhiyun #include <drm/drm_crtc.h>
14*4882a593Smuzhiyun #include <drm/drm_modeset_helper_vtables.h>
15*4882a593Smuzhiyun #include <drm/drm_panel.h>
16*4882a593Smuzhiyun #include <drm/drm_simple_kms_helper.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include "rcar_du_drv.h"
19*4882a593Smuzhiyun #include "rcar_du_encoder.h"
20*4882a593Smuzhiyun #include "rcar_du_kms.h"
21*4882a593Smuzhiyun #include "rcar_lvds.h"
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun /* -----------------------------------------------------------------------------
24*4882a593Smuzhiyun * Encoder
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun
rcar_du_encoder_count_ports(struct device_node * node)27*4882a593Smuzhiyun static unsigned int rcar_du_encoder_count_ports(struct device_node *node)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct device_node *ports;
30*4882a593Smuzhiyun struct device_node *port;
31*4882a593Smuzhiyun unsigned int num_ports = 0;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun ports = of_get_child_by_name(node, "ports");
34*4882a593Smuzhiyun if (!ports)
35*4882a593Smuzhiyun ports = of_node_get(node);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun for_each_child_of_node(ports, port) {
38*4882a593Smuzhiyun if (of_node_name_eq(port, "port"))
39*4882a593Smuzhiyun num_ports++;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun of_node_put(ports);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return num_ports;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
rcar_du_encoder_init(struct rcar_du_device * rcdu,enum rcar_du_output output,struct device_node * enc_node)47*4882a593Smuzhiyun int rcar_du_encoder_init(struct rcar_du_device *rcdu,
48*4882a593Smuzhiyun enum rcar_du_output output,
49*4882a593Smuzhiyun struct device_node *enc_node)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun struct rcar_du_encoder *renc;
52*4882a593Smuzhiyun struct drm_encoder *encoder;
53*4882a593Smuzhiyun struct drm_bridge *bridge;
54*4882a593Smuzhiyun int ret;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
57*4882a593Smuzhiyun if (renc == NULL)
58*4882a593Smuzhiyun return -ENOMEM;
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun renc->output = output;
61*4882a593Smuzhiyun encoder = rcar_encoder_to_drm_encoder(renc);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
64*4882a593Smuzhiyun enc_node, output);
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun /*
67*4882a593Smuzhiyun * Locate the DRM bridge from the DT node. For the DPAD outputs, if the
68*4882a593Smuzhiyun * DT node has a single port, assume that it describes a panel and
69*4882a593Smuzhiyun * create a panel bridge.
70*4882a593Smuzhiyun */
71*4882a593Smuzhiyun if ((output == RCAR_DU_OUTPUT_DPAD0 ||
72*4882a593Smuzhiyun output == RCAR_DU_OUTPUT_DPAD1) &&
73*4882a593Smuzhiyun rcar_du_encoder_count_ports(enc_node) == 1) {
74*4882a593Smuzhiyun struct drm_panel *panel = of_drm_find_panel(enc_node);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun if (IS_ERR(panel)) {
77*4882a593Smuzhiyun ret = PTR_ERR(panel);
78*4882a593Smuzhiyun goto done;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun bridge = devm_drm_panel_bridge_add_typed(rcdu->dev, panel,
82*4882a593Smuzhiyun DRM_MODE_CONNECTOR_DPI);
83*4882a593Smuzhiyun if (IS_ERR(bridge)) {
84*4882a593Smuzhiyun ret = PTR_ERR(bridge);
85*4882a593Smuzhiyun goto done;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun } else {
88*4882a593Smuzhiyun bridge = of_drm_find_bridge(enc_node);
89*4882a593Smuzhiyun if (!bridge) {
90*4882a593Smuzhiyun ret = -EPROBE_DEFER;
91*4882a593Smuzhiyun goto done;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun if (output == RCAR_DU_OUTPUT_LVDS0 ||
95*4882a593Smuzhiyun output == RCAR_DU_OUTPUT_LVDS1)
96*4882a593Smuzhiyun rcdu->lvds[output - RCAR_DU_OUTPUT_LVDS0] = bridge;
97*4882a593Smuzhiyun }
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun /*
100*4882a593Smuzhiyun * On Gen3 skip the LVDS1 output if the LVDS1 encoder is used as a
101*4882a593Smuzhiyun * companion for LVDS0 in dual-link mode.
102*4882a593Smuzhiyun */
103*4882a593Smuzhiyun if (rcdu->info->gen >= 3 && output == RCAR_DU_OUTPUT_LVDS1) {
104*4882a593Smuzhiyun if (rcar_lvds_dual_link(bridge)) {
105*4882a593Smuzhiyun ret = -ENOLINK;
106*4882a593Smuzhiyun goto done;
107*4882a593Smuzhiyun }
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun
110*4882a593Smuzhiyun ret = drm_simple_encoder_init(rcdu->ddev, encoder,
111*4882a593Smuzhiyun DRM_MODE_ENCODER_NONE);
112*4882a593Smuzhiyun if (ret < 0)
113*4882a593Smuzhiyun goto done;
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun /*
116*4882a593Smuzhiyun * Attach the bridge to the encoder. The bridge will create the
117*4882a593Smuzhiyun * connector.
118*4882a593Smuzhiyun */
119*4882a593Smuzhiyun ret = drm_bridge_attach(encoder, bridge, NULL, 0);
120*4882a593Smuzhiyun if (ret) {
121*4882a593Smuzhiyun drm_encoder_cleanup(encoder);
122*4882a593Smuzhiyun return ret;
123*4882a593Smuzhiyun }
124*4882a593Smuzhiyun
125*4882a593Smuzhiyun done:
126*4882a593Smuzhiyun if (ret < 0) {
127*4882a593Smuzhiyun if (encoder->name)
128*4882a593Smuzhiyun encoder->funcs->destroy(encoder);
129*4882a593Smuzhiyun devm_kfree(rcdu->dev, renc);
130*4882a593Smuzhiyun }
131*4882a593Smuzhiyun
132*4882a593Smuzhiyun return ret;
133*4882a593Smuzhiyun }
134