1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4 * Author:
5 * Sandy Huang <hjc@rock-chips.com>
6 */
7
8 #include <linux/component.h>
9 #include <linux/of_graph.h>
10
11 #include <drm/drm_atomic_helper.h>
12 #include <drm/drm_bridge.h>
13 #include <drm/drm_dp_helper.h>
14 #include <drm/drm_of.h>
15 #include <drm/drm_panel.h>
16 #include <drm/drm_probe_helper.h>
17 #include <drm/drm_simple_kms_helper.h>
18
19 #include "rockchip_drm_drv.h"
20 #include "rockchip_drm_vop.h"
21 #include "rockchip_rgb.h"
22
23 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
24
25 struct rockchip_rgb {
26 struct device *dev;
27 struct drm_device *drm_dev;
28 struct drm_bridge *bridge;
29 struct drm_encoder encoder;
30 int output_mode;
31 };
32
33 static int
rockchip_rgb_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)34 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
35 struct drm_crtc_state *crtc_state,
36 struct drm_connector_state *conn_state)
37 {
38 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
39 struct drm_connector *connector = conn_state->connector;
40 struct drm_display_info *info = &connector->display_info;
41 u32 bus_format;
42
43 if (info->num_bus_formats)
44 bus_format = info->bus_formats[0];
45 else
46 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
47
48 switch (bus_format) {
49 case MEDIA_BUS_FMT_RGB666_1X18:
50 s->output_mode = ROCKCHIP_OUT_MODE_P666;
51 break;
52 case MEDIA_BUS_FMT_RGB565_1X16:
53 s->output_mode = ROCKCHIP_OUT_MODE_P565;
54 break;
55 case MEDIA_BUS_FMT_RGB888_1X24:
56 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
57 default:
58 s->output_mode = ROCKCHIP_OUT_MODE_P888;
59 break;
60 }
61
62 s->output_type = DRM_MODE_CONNECTOR_LVDS;
63
64 return 0;
65 }
66
67 static const
68 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
69 .atomic_check = rockchip_rgb_encoder_atomic_check,
70 };
71
rockchip_rgb_init(struct device * dev,struct drm_crtc * crtc,struct drm_device * drm_dev)72 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
73 struct drm_crtc *crtc,
74 struct drm_device *drm_dev)
75 {
76 struct rockchip_rgb *rgb;
77 struct drm_encoder *encoder;
78 struct device_node *port, *endpoint;
79 u32 endpoint_id;
80 int ret = 0, child_count = 0;
81 struct drm_panel *panel;
82 struct drm_bridge *bridge;
83
84 rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
85 if (!rgb)
86 return ERR_PTR(-ENOMEM);
87
88 rgb->dev = dev;
89 rgb->drm_dev = drm_dev;
90
91 port = of_graph_get_port_by_id(dev->of_node, 0);
92 if (!port)
93 return ERR_PTR(-EINVAL);
94
95 for_each_child_of_node(port, endpoint) {
96 if (of_property_read_u32(endpoint, "reg", &endpoint_id))
97 endpoint_id = 0;
98
99 /* if subdriver (> 0) or error case (< 0), ignore entry */
100 if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
101 continue;
102
103 child_count++;
104 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
105 &panel, &bridge);
106 if (!ret) {
107 of_node_put(endpoint);
108 break;
109 }
110 }
111
112 of_node_put(port);
113
114 /* if the rgb output is not connected to anything, just return */
115 if (!child_count)
116 return NULL;
117
118 if (ret < 0) {
119 if (ret != -EPROBE_DEFER)
120 DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
121 return ERR_PTR(ret);
122 }
123
124 encoder = &rgb->encoder;
125 encoder->possible_crtcs = drm_crtc_mask(crtc);
126
127 ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
128 if (ret < 0) {
129 DRM_DEV_ERROR(drm_dev->dev,
130 "failed to initialize encoder: %d\n", ret);
131 return ERR_PTR(ret);
132 }
133
134 drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
135
136 if (panel) {
137 bridge = drm_panel_bridge_add_typed(panel,
138 DRM_MODE_CONNECTOR_LVDS);
139 if (IS_ERR(bridge))
140 return ERR_CAST(bridge);
141 }
142
143 rgb->bridge = bridge;
144
145 ret = drm_bridge_attach(encoder, rgb->bridge, NULL, 0);
146 if (ret)
147 goto err_free_encoder;
148
149 return rgb;
150
151 err_free_encoder:
152 drm_encoder_cleanup(encoder);
153 return ERR_PTR(ret);
154 }
155 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
156
rockchip_rgb_fini(struct rockchip_rgb * rgb)157 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
158 {
159 drm_panel_bridge_remove(rgb->bridge);
160 drm_encoder_cleanup(&rgb->encoder);
161 }
162 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);
163