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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2023 Loongson Technology Corporation Limited
*/
#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>
#include "lsdc_drv.h"
#include "lsdc_output.h"
/*
* The display controller in the LS7A1000 exports two DVO interfaces, thus
* external encoder is required, except connected to the DPI panel directly.
*
* ___________________ _________
* | -------| | |
* | CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Display |
* | _ _ -------| ^ ^ |_________|
* | | | | | +------+ | | |
* | |_| |_| | i2c6 | <--------+-------------+
* | +------+ |
* | |
* | DC in LS7A1000 |
* | |
* | _ _ +------+ |
* | | | | | | i2c7 | <--------+-------------+
* | |_| |_| +------+ | | | _________
* | -------| | | | |
* | CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> | Panel |
* | -------| |_________|
* |___________________|
*
* Currently, we assume the external encoders connected to the DVO are
* transparent. Loongson's DVO interface can directly drive RGB888 panels.
*
* TODO: Add support for non-transparent encoders
*/
static int ls7a1000_dpi_connector_get_modes(struct drm_connector *conn)
{
int num;
if (conn->ddc) {
const struct drm_edid *drm_edid;
drm_edid = drm_edid_read(conn);
drm_edid_connector_update(conn, drm_edid);
num = drm_edid_connector_add_modes(conn);
drm_edid_free(drm_edid);
return num;
}
num = drm_add_modes_noedid(conn, 1920, 1200);
drm_set_preferred_mode(conn, 1024, 768);
return num;
}
static struct drm_encoder *
ls7a1000_dpi_connector_get_best_encoder(struct drm_connector *connector,
struct drm_atomic_state *state)
{
struct lsdc_output *output = connector_to_lsdc_output(connector);
return &output->encoder;
}
static const struct drm_connector_helper_funcs
ls7a1000_dpi_connector_helpers = {
.atomic_best_encoder = ls7a1000_dpi_connector_get_best_encoder,
.get_modes = ls7a1000_dpi_connector_get_modes,
};
static enum drm_connector_status
ls7a1000_dpi_connector_detect(struct drm_connector *connector, bool force)
{
struct i2c_adapter *ddc = connector->ddc;
if (ddc) {
if (drm_probe_ddc(ddc))
return connector_status_connected;
return connector_status_disconnected;
}
return connector_status_unknown;
}
static const struct drm_connector_funcs ls7a1000_dpi_connector_funcs = {
.detect = ls7a1000_dpi_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state
};
static void ls7a1000_pipe0_encoder_reset(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
struct lsdc_device *ldev = to_lsdc(ddev);
/*
* We need this for S3 support, screen will not lightup if don't set
* this register correctly.
*/
lsdc_wreg32(ldev, LSDC_CRTC0_DVO_CONF_REG,
PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN);
}
static void ls7a1000_pipe1_encoder_reset(struct drm_encoder *encoder)
{
struct drm_device *ddev = encoder->dev;
struct lsdc_device *ldev = to_lsdc(ddev);
/*
* We need this for S3 support, screen will not lightup if don't set
* this register correctly.
*/
/* DVO */
lsdc_wreg32(ldev, LSDC_CRTC1_DVO_CONF_REG,
BIT(31) | PHY_CLOCK_POL | PHY_CLOCK_EN | PHY_DATA_EN);
}
static const struct drm_encoder_funcs ls7a1000_encoder_funcs[2] = {
{
.reset = ls7a1000_pipe0_encoder_reset,
.destroy = drm_encoder_cleanup,
},
{
.reset = ls7a1000_pipe1_encoder_reset,
.destroy = drm_encoder_cleanup,
},
};
int ls7a1000_output_init(struct drm_device *ddev,
struct lsdc_display_pipe *dispipe,
struct i2c_adapter *ddc,
unsigned int index)
{
struct lsdc_output *output = &dispipe->output;
struct drm_encoder *encoder = &output->encoder;
struct drm_connector *connector = &output->connector;
int ret;
ret = drm_encoder_init(ddev, encoder, &ls7a1000_encoder_funcs[index],
DRM_MODE_ENCODER_TMDS, "encoder-%u", index);
if (ret)
return ret;
encoder->possible_crtcs = BIT(index);
ret = drm_connector_init_with_ddc(ddev, connector,
&ls7a1000_dpi_connector_funcs,
DRM_MODE_CONNECTOR_DPI, ddc);
if (ret)
return ret;
drm_info(ddev, "display pipe-%u has a DVO\n", index);
drm_connector_helper_add(connector, &ls7a1000_dpi_connector_helpers);
drm_connector_attach_encoder(connector, encoder);
connector->polled = DRM_CONNECTOR_POLL_CONNECT |
DRM_CONNECTOR_POLL_DISCONNECT;
connector->interlace_allowed = 0;
connector->doublescan_allowed = 0;
return 0;
}
|
