tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <drm/drmP.h>
18#include <drm/drm_atomic_helper.h>
19#include <drm/drm_crtc_helper.h>
20#include <drm/drm_dp_helper.h>
21#include <drm/drm_panel.h>
22#include <drm/drm_of.h>
23
24#include <linux/component.h>
25#include <linux/of_graph.h>
26
27#include "rockchip_drm_drv.h"
28#include "rockchip_drm_vop.h"
29
30#define encoder_to_rgb(c) container_of(c, struct rockchip_rgb, encoder)
31
32struct rockchip_rgb {
33 struct device *dev;
34 struct drm_device *drm_dev;
35 struct drm_bridge *bridge;
36 struct drm_encoder encoder;
37 int output_mode;
38};
39
40static int
41rockchip_rgb_encoder_atomic_check(struct drm_encoder *encoder,
42 struct drm_crtc_state *crtc_state,
43 struct drm_connector_state *conn_state)
44{
45 struct rockchip_crtc_state *s = to_rockchip_crtc_state(crtc_state);
46 struct drm_connector *connector = conn_state->connector;
47 struct drm_display_info *info = &connector->display_info;
48 u32 bus_format;
49
50 if (info->num_bus_formats)
51 bus_format = info->bus_formats[0];
52 else
53 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
54
55 switch (bus_format) {
56 case MEDIA_BUS_FMT_RGB666_1X18:
57 s->output_mode = ROCKCHIP_OUT_MODE_P666;
58 break;
59 case MEDIA_BUS_FMT_RGB565_1X16:
60 s->output_mode = ROCKCHIP_OUT_MODE_P565;
61 break;
62 case MEDIA_BUS_FMT_RGB888_1X24:
63 case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
64 default:
65 s->output_mode = ROCKCHIP_OUT_MODE_P888;
66 break;
67 }
68
69 s->output_type = DRM_MODE_CONNECTOR_LVDS;
70
71 return 0;
72}
73
74static const
75struct drm_encoder_helper_funcs rockchip_rgb_encoder_helper_funcs = {
76 .atomic_check = rockchip_rgb_encoder_atomic_check,
77};
78
79static const struct drm_encoder_funcs rockchip_rgb_encoder_funcs = {
80 .destroy = drm_encoder_cleanup,
81};
82
83struct rockchip_rgb *rockchip_rgb_init(struct device *dev,
84 struct drm_crtc *crtc,
85 struct drm_device *drm_dev)
86{
87 struct rockchip_rgb *rgb;
88 struct drm_encoder *encoder;
89 struct device_node *port, *endpoint;
90 u32 endpoint_id;
91 int ret = 0, child_count = 0;
92 struct drm_panel *panel;
93 struct drm_bridge *bridge;
94
95 rgb = devm_kzalloc(dev, sizeof(*rgb), GFP_KERNEL);
96 if (!rgb)
97 return ERR_PTR(-ENOMEM);
98
99 rgb->dev = dev;
100 rgb->drm_dev = drm_dev;
101
102 port = of_graph_get_port_by_id(dev->of_node, 0);
103 if (!port)
104 return ERR_PTR(-EINVAL);
105
106 for_each_child_of_node(port, endpoint) {
107 if (of_property_read_u32(endpoint, "reg", &endpoint_id))
108 endpoint_id = 0;
109
110 if (rockchip_drm_endpoint_is_subdriver(endpoint) > 0)
111 continue;
112
113 child_count++;
114 ret = drm_of_find_panel_or_bridge(dev->of_node, 0, endpoint_id,
115 &panel, &bridge);
116 if (!ret) {
117 of_node_put(endpoint);
118 break;
119 }
120 }
121
122 of_node_put(port);
123
124 /* if the rgb output is not connected to anything, just return */
125 if (!child_count)
126 return NULL;
127
128 if (ret < 0) {
129 if (ret != -EPROBE_DEFER)
130 DRM_DEV_ERROR(dev, "failed to find panel or bridge %d\n", ret);
131 return ERR_PTR(ret);
132 }
133
134 encoder = &rgb->encoder;
135 encoder->possible_crtcs = drm_crtc_mask(crtc);
136
137 ret = drm_encoder_init(drm_dev, encoder, &rockchip_rgb_encoder_funcs,
138 DRM_MODE_ENCODER_NONE, NULL);
139 if (ret < 0) {
140 DRM_DEV_ERROR(drm_dev->dev,
141 "failed to initialize encoder: %d\n", ret);
142 return ERR_PTR(ret);
143 }
144
145 drm_encoder_helper_add(encoder, &rockchip_rgb_encoder_helper_funcs);
146
147 if (panel) {
148 bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_LVDS);
149 if (IS_ERR(bridge))
150 return ERR_CAST(bridge);
151 }
152
153 rgb->bridge = bridge;
154
155 ret = drm_bridge_attach(encoder, rgb->bridge, NULL);
156 if (ret) {
157 DRM_DEV_ERROR(drm_dev->dev,
158 "failed to attach bridge: %d\n", ret);
159 goto err_free_encoder;
160 }
161
162 return rgb;
163
164err_free_encoder:
165 drm_encoder_cleanup(encoder);
166 return ERR_PTR(ret);
167}
168EXPORT_SYMBOL_GPL(rockchip_rgb_init);
169
170void rockchip_rgb_fini(struct rockchip_rgb *rgb)
171{
172 drm_panel_bridge_remove(rgb->bridge);
173 drm_encoder_cleanup(&rgb->encoder);
174}
175EXPORT_SYMBOL_GPL(rockchip_rgb_fini);