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
|
/*
* Copyright (C) 2014 Traphandler
* Copyright (C) 2014 Free Electrons
* Copyright (C) 2014 Atmel
*
* Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/media-bus-format.h>
#include <linux/of_graph.h>
#include <drm/drm_encoder.h>
#include <drm/drm_of.h>
#include <drm/drm_bridge.h>
#include "atmel_hlcdc_dc.h"
struct atmel_hlcdc_rgb_output {
struct drm_encoder encoder;
int bus_fmt;
};
static const struct drm_encoder_funcs atmel_hlcdc_panel_encoder_funcs = {
.destroy = drm_encoder_cleanup,
};
static struct atmel_hlcdc_rgb_output *
atmel_hlcdc_encoder_to_rgb_output(struct drm_encoder *encoder)
{
return container_of(encoder, struct atmel_hlcdc_rgb_output, encoder);
}
int atmel_hlcdc_encoder_get_bus_fmt(struct drm_encoder *encoder)
{
struct atmel_hlcdc_rgb_output *output;
output = atmel_hlcdc_encoder_to_rgb_output(encoder);
return output->bus_fmt;
}
static int atmel_hlcdc_of_bus_fmt(const struct device_node *ep)
{
u32 bus_width;
int ret;
ret = of_property_read_u32(ep, "bus-width", &bus_width);
if (ret == -EINVAL)
return 0;
if (ret)
return ret;
switch (bus_width) {
case 12:
return MEDIA_BUS_FMT_RGB444_1X12;
case 16:
return MEDIA_BUS_FMT_RGB565_1X16;
case 18:
return MEDIA_BUS_FMT_RGB666_1X18;
case 24:
return MEDIA_BUS_FMT_RGB888_1X24;
default:
return -EINVAL;
}
}
static int atmel_hlcdc_attach_endpoint(struct drm_device *dev, int endpoint)
{
struct atmel_hlcdc_rgb_output *output;
struct device_node *ep;
struct drm_panel *panel;
struct drm_bridge *bridge;
int ret;
ep = of_graph_get_endpoint_by_regs(dev->dev->of_node, 0, endpoint);
if (!ep)
return -ENODEV;
ret = drm_of_find_panel_or_bridge(dev->dev->of_node, 0, endpoint,
&panel, &bridge);
if (ret) {
of_node_put(ep);
return ret;
}
output = devm_kzalloc(dev->dev, sizeof(*output), GFP_KERNEL);
if (!output) {
of_node_put(ep);
return -ENOMEM;
}
output->bus_fmt = atmel_hlcdc_of_bus_fmt(ep);
of_node_put(ep);
if (output->bus_fmt < 0) {
dev_err(dev->dev, "endpoint %d: invalid bus width\n", endpoint);
return -EINVAL;
}
ret = drm_encoder_init(dev, &output->encoder,
&atmel_hlcdc_panel_encoder_funcs,
DRM_MODE_ENCODER_NONE, NULL);
if (ret)
return ret;
output->encoder.possible_crtcs = 0x1;
if (panel) {
bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_Unknown);
if (IS_ERR(bridge))
return PTR_ERR(bridge);
}
if (bridge) {
ret = drm_bridge_attach(&output->encoder, bridge, NULL);
if (!ret)
return 0;
if (panel)
drm_panel_bridge_remove(bridge);
}
drm_encoder_cleanup(&output->encoder);
return ret;
}
int atmel_hlcdc_create_outputs(struct drm_device *dev)
{
int endpoint, ret = 0;
int attached = 0;
/*
* Always scan the first few endpoints even if we get -ENODEV,
* but keep going after that as long as we keep getting hits.
*/
for (endpoint = 0; !ret || endpoint < 4; endpoint++) {
ret = atmel_hlcdc_attach_endpoint(dev, endpoint);
if (ret == -ENODEV)
continue;
if (ret)
break;
attached++;
}
/* At least one device was successfully attached.*/
if (ret == -ENODEV && attached)
return 0;
return ret;
}
|
