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/media-bus-format.h>
10 #include <linux/of_graph.h>
11
12 #include <drm/display/drm_dp_helper.h>
13 #include <drm/drm_atomic_helper.h>
14 #include <drm/drm_bridge.h>
15 #include <drm/drm_bridge_connector.h>
16 #include <drm/drm_of.h>
17 #include <drm/drm_panel.h>
18 #include <drm/drm_probe_helper.h>
19 #include <drm/drm_simple_kms_helper.h>
20
21 #include "rockchip_drm_drv.h"
22 #include "rockchip_drm_vop.h"
23 #include "rockchip_rgb.h"
24
25 struct rockchip_rgb {
26 struct device *dev;
27 struct drm_device *drm_dev;
28 struct drm_bridge *bridge;
29 struct rockchip_encoder encoder;
30 struct drm_connector connector;
31 int output_mode;
32 };
33
34 static int
rockchip_rgb_encoder_atomic_check(struct drm_encoder * encoder,struct drm_crtc_state * crtc_state,struct drm_connector_state * conn_state)35 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
36 struct drm_crtc_state *crtc_state,
37 struct drm_connector_state *conn_state)
38 {
39 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
40 struct drm_connector *connector = conn_state->connector;
41 struct drm_display_info *info = &connector->display_info;
42 u32 bus_format;
43
44 if (info->num_bus_formats)
45 bus_format = info->bus_formats[0];
46 else
47 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
48
49 switch (bus_format) {
50 case MEDIA_BUS_FMT_RGB666_1X18:
51 s->output_mode = ROCKCHIP_OUT_MODE_P666;
52 break;
53 case MEDIA_BUS_FMT_RGB565_1X16:
54 s->output_mode = ROCKCHIP_OUT_MODE_P565;
55 break;
56 case MEDIA_BUS_FMT_RGB888_1X24:
57 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
58 default:
59 s->output_mode = ROCKCHIP_OUT_MODE_P888;
60 break;
61 }
62
63 s->output_type = DRM_MODE_CONNECTOR_LVDS;
64
65 return 0;
66 }
67
68 static const
69 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
70 .atomic_check = rockchip_rgb_encoder_atomic_check,
71 };
72
rockchip_rgb_init(struct device * dev,struct drm_crtc * crtc,struct drm_device * drm_dev,int video_port)73 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
74 struct drm_crtc *crtc,
75 struct drm_device *drm_dev,
76 int video_port)
77 {
78 struct rockchip_rgb *rgb;
79 struct drm_encoder *encoder;
80 struct device_node *port, *endpoint;
81 u32 endpoint_id;
82 int ret = 0, child_count = 0;
83 struct drm_panel *panel;
84 struct drm_bridge *bridge;
85 struct drm_connector *connector;
86
87 rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
88 if (!rgb)
89 return ERR_PTR(-ENOMEM);
90
91 rgb->dev = dev;
92 rgb->drm_dev = drm_dev;
93
94 port = of_graph_get_port_by_id(dev->of_node, video_port);
95 if (!port)
96 return ERR_PTR(-EINVAL);
97
98 for_each_child_of_node(port, endpoint) {
99 if (of_property_read_u32(endpoint, "reg", &endpoint_id))
100 endpoint_id = 0;
101
102 /* if subdriver (> 0) or error case (< 0), ignore entry */
103 if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
104 continue;
105
106 child_count++;
107 ret = drm_of_find_panel_or_bridge(dev->of_node, video_port,
108 endpoint_id, &panel, &bridge);
109 if (!ret) {
110 of_node_put(endpoint);
111 break;
112 }
113 }
114
115 of_node_put(port);
116
117 /* if the rgb output is not connected to anything, just return */
118 if (!child_count)
119 return NULL;
120
121 if (ret < 0) {
122 if (ret != -EPROBE_DEFER)
123 DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
124 return ERR_PTR(ret);
125 }
126
127 encoder = &rgb->encoder.encoder;
128 encoder->possible_crtcs = drm_crtc_mask(crtc);
129
130 ret = drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_NONE);
131 if (ret < 0) {
132 DRM_DEV_ERROR(drm_dev->dev,
133 "failed to initialize encoder: %d\n", ret);
134 return ERR_PTR(ret);
135 }
136
137 drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
138
139 if (panel) {
140 bridge = drm_panel_bridge_add_typed(panel,
141 DRM_MODE_CONNECTOR_LVDS);
142 if (IS_ERR(bridge))
143 return ERR_CAST(bridge);
144 }
145
146 rgb->bridge = bridge;
147
148 ret = drm_bridge_attach(encoder, rgb->bridge, NULL,
149 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
150 if (ret)
151 goto err_free_encoder;
152
153 connector = &rgb->connector;
154 connector = drm_bridge_connector_init(rgb->drm_dev, encoder);
155 if (IS_ERR(connector)) {
156 DRM_DEV_ERROR(drm_dev->dev,
157 "failed to initialize bridge connector: %pe\n",
158 connector);
159 ret = PTR_ERR(connector);
160 goto err_free_encoder;
161 }
162
163 rgb->encoder.crtc_endpoint_id = endpoint_id;
164
165 ret = drm_connector_attach_encoder(connector, encoder);
166 if (ret < 0) {
167 DRM_DEV_ERROR(drm_dev->dev,
168 "failed to attach encoder: %d\n", ret);
169 goto err_free_connector;
170 }
171
172 return rgb;
173
174 err_free_connector:
175 drm_connector_cleanup(connector);
176 err_free_encoder:
177 drm_encoder_cleanup(encoder);
178 return ERR_PTR(ret);
179 }
180 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
181
rockchip_rgb_fini(struct rockchip_rgb * rgb)182 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
183 {
184 drm_panel_bridge_remove(rgb->bridge);
185 drm_connector_cleanup(&rgb->connector);
186 drm_encoder_cleanup(&rgb->encoder.encoder);
187 }
188 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);
189