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
|
/*
* Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
*
* 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/of_irq.h>
#include "hdmi.h"
void init_ddc(struct hdmi *hdmi)
{
uint32_t ddc_speed;
hdmi_write(hdmi, REG_HDMI_DDC_CTRL,
HDMI_DDC_CTRL_SW_STATUS_RESET);
hdmi_write(hdmi, REG_HDMI_DDC_CTRL,
HDMI_DDC_CTRL_SOFT_RESET);
ddc_speed = hdmi_read(hdmi, REG_HDMI_DDC_SPEED);
ddc_speed |= HDMI_DDC_SPEED_THRESHOLD(2);
ddc_speed |= HDMI_DDC_SPEED_PRESCALE(12);
hdmi_write(hdmi, REG_HDMI_DDC_SPEED,
ddc_speed);
hdmi_write(hdmi, REG_HDMI_DDC_SETUP,
HDMI_DDC_SETUP_TIMEOUT(0xff));
/* enable reference timer for 19us */
hdmi_write(hdmi, REG_HDMI_DDC_REF,
HDMI_DDC_REF_REFTIMER_ENABLE |
HDMI_DDC_REF_REFTIMER(19));
}
int ddc_clear_irq(struct hdmi *hdmi)
{
struct hdmi_i2c_adapter *hdmi_i2c = to_hdmi_i2c_adapter(hdmi->i2c);
struct drm_device *dev = hdmi->dev;
uint32_t retry = 0xffff;
uint32_t ddc_int_ctrl;
do {
--retry;
hdmi_write(hdmi, REG_HDMI_DDC_INT_CTRL,
HDMI_DDC_INT_CTRL_SW_DONE_ACK |
HDMI_DDC_INT_CTRL_SW_DONE_MASK);
ddc_int_ctrl = hdmi_read(hdmi, REG_HDMI_DDC_INT_CTRL);
} while ((ddc_int_ctrl & HDMI_DDC_INT_CTRL_SW_DONE_INT) && retry);
if (!retry) {
dev_err(dev->dev, "timeout waiting for DDC\n");
return -ETIMEDOUT;
}
hdmi_i2c->sw_done = false;
return 0;
}
int hdmi_ddc_read(struct hdmi *hdmi, u16 addr, u8 offset,
u8 *data, u16 data_len, bool self_retry)
{
int rc;
int retry = 10;
struct i2c_msg msgs[] = {
{
.addr = addr >> 1,
.flags = 0,
.len = 1,
.buf = &offset,
}, {
.addr = addr >> 1,
.flags = I2C_M_RD,
.len = data_len,
.buf = data,
}
};
DBG("Start DDC read");
retry:
rc = i2c_transfer(hdmi->i2c, msgs, 2);
retry--;
if (rc == 2)
rc = 0;
else if (self_retry && (retry > 0))
goto retry;
else
rc = -EIO;
DBG("End DDC read %d", rc);
return rc;
}
#define HDCP_DDC_WRITE_MAX_BYTE_NUM 1024
int hdmi_ddc_write(struct hdmi *hdmi, u16 addr, u8 offset,
u8 *data, u16 data_len, bool self_retry)
{
int rc;
int retry = 10;
u8 buf[HDCP_DDC_WRITE_MAX_BYTE_NUM];
struct i2c_msg msgs[] = {
{
.addr = addr >> 1,
.flags = 0,
.len = 1,
}
};
pr_debug("TESTING ! REMOVE RETRY Start DDC write");
if (data_len > (HDCP_DDC_WRITE_MAX_BYTE_NUM - 1)) {
pr_err("%s: write size too big\n", __func__);
return -ERANGE;
}
buf[0] = offset;
memcpy(&buf[1], data, data_len);
msgs[0].buf = buf;
msgs[0].len = data_len + 1;
retry:
rc = i2c_transfer(hdmi->i2c, msgs, 1);
retry--;
if (rc == 1)
rc = 0;
else if (self_retry && (retry > 0))
goto retry;
else
rc = -EIO;
DBG("End DDC write %d", rc);
return rc;
}
|
