1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
// SPDX-License-Identifier: GPL-2.0
/*
* THC63LVD1024 LVDS to parallel data DRM bridge driver.
*
* Copyright (C) 2018 Jacopo Mondi <jacopo+renesas@jmondi.org>
*/
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <drm/drm_bridge.h>
#include <drm/drm_panel.h>
enum thc63_ports {
THC63_LVDS_IN0,
THC63_LVDS_IN1,
THC63_RGB_OUT0,
THC63_RGB_OUT1,
};
struct thc63_dev {
struct device *dev;
struct regulator *vcc;
struct gpio_desc *pdwn;
struct gpio_desc *oe;
struct drm_bridge bridge;
struct drm_bridge *next;
struct drm_bridge_timings timings;
};
static inline struct thc63_dev *to_thc63(struct drm_bridge *bridge)
{
return container_of(bridge, struct thc63_dev, bridge);
}
static int thc63_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct thc63_dev *thc63 = to_thc63(bridge);
return drm_bridge_attach(bridge->encoder, thc63->next, bridge, flags);
}
static enum drm_mode_status thc63_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,
const struct drm_display_mode *mode)
{
struct thc63_dev *thc63 = to_thc63(bridge);
unsigned int min_freq;
unsigned int max_freq;
/*
* The THC63LVD1024 pixel rate range is 8 to 135 MHz in all modes but
* dual-in, single-out where it is 40 to 150 MHz. As dual-in, dual-out
* isn't supported by the driver yet, simply derive the limits from the
* input mode.
*/
if (thc63->timings.dual_link) {
min_freq = 40000;
max_freq = 150000;
} else {
min_freq = 8000;
max_freq = 135000;
}
if (mode->clock < min_freq)
return MODE_CLOCK_LOW;
if (mode->clock > max_freq)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static void thc63_enable(struct drm_bridge *bridge)
{
struct thc63_dev *thc63 = to_thc63(bridge);
int ret;
ret = regulator_enable(thc63->vcc);
if (ret) {
dev_err(thc63->dev,
"Failed to enable regulator \"vcc\": %d\n", ret);
return;
}
gpiod_set_value(thc63->pdwn, 0);
gpiod_set_value(thc63->oe, 1);
}
static void thc63_disable(struct drm_bridge *bridge)
{
struct thc63_dev *thc63 = to_thc63(bridge);
int ret;
gpiod_set_value(thc63->oe, 0);
gpiod_set_value(thc63->pdwn, 1);
ret = regulator_disable(thc63->vcc);
if (ret)
dev_err(thc63->dev,
"Failed to disable regulator \"vcc\": %d\n", ret);
}
static const struct drm_bridge_funcs thc63_bridge_func = {
.attach = thc63_attach,
.mode_valid = thc63_mode_valid,
.enable = thc63_enable,
.disable = thc63_disable,
};
static int thc63_parse_dt(struct thc63_dev *thc63)
{
struct device_node *endpoint;
struct device_node *remote;
remote = of_graph_get_remote_node(thc63->dev->of_node,
THC63_RGB_OUT0, -1);
if (!remote) {
dev_err(thc63->dev, "No remote endpoint for port@%u\n",
THC63_RGB_OUT0);
return -ENODEV;
}
thc63->next = of_drm_find_bridge(remote);
of_node_put(remote);
if (!thc63->next)
return -EPROBE_DEFER;
endpoint = of_graph_get_endpoint_by_regs(thc63->dev->of_node,
THC63_LVDS_IN1, -1);
if (endpoint) {
remote = of_graph_get_remote_port_parent(endpoint);
of_node_put(endpoint);
if (remote) {
if (of_device_is_available(remote))
thc63->timings.dual_link = true;
of_node_put(remote);
}
}
dev_dbg(thc63->dev, "operating in %s-link mode\n",
thc63->timings.dual_link ? "dual" : "single");
return 0;
}
static int thc63_gpio_init(struct thc63_dev *thc63)
{
thc63->oe = devm_gpiod_get_optional(thc63->dev, "oe", GPIOD_OUT_LOW);
if (IS_ERR(thc63->oe)) {
dev_err(thc63->dev, "Unable to get \"oe-gpios\": %ld\n",
PTR_ERR(thc63->oe));
return PTR_ERR(thc63->oe);
}
thc63->pdwn = devm_gpiod_get_optional(thc63->dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(thc63->pdwn)) {
dev_err(thc63->dev, "Unable to get \"powerdown-gpios\": %ld\n",
PTR_ERR(thc63->pdwn));
return PTR_ERR(thc63->pdwn);
}
return 0;
}
static int thc63_probe(struct platform_device *pdev)
{
struct thc63_dev *thc63;
int ret;
thc63 = devm_kzalloc(&pdev->dev, sizeof(*thc63), GFP_KERNEL);
if (!thc63)
return -ENOMEM;
thc63->dev = &pdev->dev;
platform_set_drvdata(pdev, thc63);
thc63->vcc = devm_regulator_get(thc63->dev, "vcc");
if (IS_ERR(thc63->vcc)) {
if (PTR_ERR(thc63->vcc) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_err(thc63->dev, "Unable to get \"vcc\" supply: %ld\n",
PTR_ERR(thc63->vcc));
return PTR_ERR(thc63->vcc);
}
ret = thc63_gpio_init(thc63);
if (ret)
return ret;
ret = thc63_parse_dt(thc63);
if (ret)
return ret;
thc63->bridge.driver_private = thc63;
thc63->bridge.of_node = pdev->dev.of_node;
thc63->bridge.funcs = &thc63_bridge_func;
thc63->bridge.timings = &thc63->timings;
drm_bridge_add(&thc63->bridge);
return 0;
}
static void thc63_remove(struct platform_device *pdev)
{
struct thc63_dev *thc63 = platform_get_drvdata(pdev);
drm_bridge_remove(&thc63->bridge);
}
static const struct of_device_id thc63_match[] = {
{ .compatible = "thine,thc63lvd1024", },
{ },
};
MODULE_DEVICE_TABLE(of, thc63_match);
static struct platform_driver thc63_driver = {
.probe = thc63_probe,
.remove_new = thc63_remove,
.driver = {
.name = "thc63lvd1024",
.of_match_table = thc63_match,
},
};
module_platform_driver(thc63_driver);
MODULE_AUTHOR("Jacopo Mondi <jacopo@jmondi.org>");
MODULE_DESCRIPTION("Thine THC63LVD1024 LVDS decoder DRM bridge driver");
MODULE_LICENSE("GPL v2");
|
