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 
18 #include "rockchip_drm_drv.h"
19 #include "rockchip_drm_vop.h"
20 
21 #define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
22 
23 struct rockchip_rgb {
24 	struct device *dev;
25 	struct drm_device *drm_dev;
26 	struct drm_bridge *bridge;
27 	struct drm_encoder encoder;
28 	int output_mode;
29 };
30 
31 static int
32 rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
33 				   struct drm_crtc_state *crtc_state,
34 				   struct drm_connector_state *conn_state)
35 {
36 	struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
37 	struct drm_connector *connector = conn_state->connector;
38 	struct drm_display_info *info = &connector->display_info;
39 	u32 bus_format;
40 
41 	if (info->num_bus_formats)
42 		bus_format = info->bus_formats[0];
43 	else
44 		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
45 
46 	switch (bus_format) {
47 	case MEDIA_BUS_FMT_RGB666_1X18:
48 		s->output_mode = ROCKCHIP_OUT_MODE_P666;
49 		break;
50 	case MEDIA_BUS_FMT_RGB565_1X16:
51 		s->output_mode = ROCKCHIP_OUT_MODE_P565;
52 		break;
53 	case MEDIA_BUS_FMT_RGB888_1X24:
54 	case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
55 	default:
56 		s->output_mode = ROCKCHIP_OUT_MODE_P888;
57 		break;
58 	}
59 
60 	s->output_type = DRM_MODE_CONNECTOR_LVDS;
61 
62 	return 0;
63 }
64 
65 static const
66 struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
67 	.atomic_check = rockchip_rgb_encoder_atomic_check,
68 };
69 
70 static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = {
71 	.destroy = drm_encoder_cleanup,
72 };
73 
74 struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
75 				       struct drm_crtc *crtc,
76 				       struct drm_device *drm_dev)
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 
86 	rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
87 	if (!rgb)
88 		return ERR_PTR(-ENOMEM);
89 
90 	rgb->dev = dev;
91 	rgb->drm_dev = drm_dev;
92 
93 	port = of_graph_get_port_by_id(dev->of_node, 0);
94 	if (!port)
95 		return ERR_PTR(-EINVAL);
96 
97 	for_each_child_of_node(port, endpoint) {
98 		if (of_property_read_u32(endpoint, "reg", &endpoint_id))
99 			endpoint_id = 0;
100 
101 		/* if subdriver (> 0) or error case (< 0), ignore entry */
102 		if (rockchip_drm_endpoint_is_subdriver(endpoint) != 0)
103 			continue;
104 
105 		child_count++;
106 		ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
107 						  &panel, &bridge);
108 		if (!ret) {
109 			of_node_put(endpoint);
110 			break;
111 		}
112 	}
113 
114 	of_node_put(port);
115 
116 	/* if the rgb output is not connected to anything, just return */
117 	if (!child_count)
118 		return NULL;
119 
120 	if (ret < 0) {
121 		if (ret != -EPROBE_DEFER)
122 			DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
123 		return ERR_PTR(ret);
124 	}
125 
126 	encoder = &rgb->encoder;
127 	encoder->possible_crtcs = drm_crtc_mask(crtc);
128 
129 	ret = drm_encoder_init(drm_dev, encoder, &rockchip_rgb_encoder_funcs,
130 			       DRM_MODE_ENCODER_NONE, NULL);
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, 0);
149 	if (ret) {
150 		DRM_DEV_ERROR(drm_dev->dev,
151 			      "failed to attach bridge: %d\n", ret);
152 		goto err_free_encoder;
153 	}
154 
155 	return rgb;
156 
157 err_free_encoder:
158 	drm_encoder_cleanup(encoder);
159 	return ERR_PTR(ret);
160 }
161 EXPORT_SYMBOL_GPL(rockchip_rgb_init);
162 
163 void rockchip_rgb_fini(struct rockchip_rgb *rgb)
164 {
165 	drm_panel_bridge_remove(rgb->bridge);
166 	drm_encoder_cleanup(&rgb->encoder);
167 }
168 EXPORT_SYMBOL_GPL(rockchip_rgb_fini);
169