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
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Siemens AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* 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, write to the Free Software
* Foundation, Inc.
*/
#include <console/console.h>
#include "baytrail/i2c.h"
#include "ptn3460.h"
/** \brief This functions sets up the DP2LVDS-converter to be used with the
* appropriate lcd panel
* @param lcd_type Type of LCD we should set up the converter for
* @param *sib Pointer to short info block structure
* @param *eib Pointer to EDID info block structure
* @return 0 on success or error code
*/
int ptn3460_init(char lcd_type, struct edidinfo *eib, struct shortinfo *sib)
{
struct ptn_3460_config cfg;
int status;
status = i2c_init(PTN_I2C_CONTROLER);
if (status)
return (PTN_BUS_ERROR | status);
/* If we are here, we have all the desired information for setting up */
/* DP2LVDS converter. In addition, the information matches the connected */
/* LCD-panel and therefore, we do not have to distinguish between */
/* different panels here for the timing. Inside the converter, table 6 */
/* will be used for the timings. */
status = ptn3460_write_edid(6, eib->edid);
if (status)
return status;
/* Select this table to be emulated */
ptn_select_edid(6);
/* Read PTN configuration data */
status = i2c_read(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF,
(u8*)&cfg, PTN_CONFIG_LEN);
if (status)
return (PTN_BUS_ERROR | status);
/* Set up configuration data according to the information blocks we get */
cfg.dp_interface_ctrl = 0;
cfg.lvds_interface_ctrl1 = 0x00;
if (sib->panelFeatures[SIB_DISP_CON_IDX] == SIB_LVDS_DUAL_LANE)
cfg.lvds_interface_ctrl1 |= 0x0b; /* Turn on dual LVDS lane and clock */
if ((sib->panelFeatures[SIB_HWINIT_IDX] & 0x03) == SIB_COLOR_6BIT)
cfg.lvds_interface_ctrl1 |= 0x20; /* Use 18 bits per pixel */
cfg.lvds_interface_ctrl2 = 0x03; /* no clock spreading, 300 mV LVDS swing */
cfg.lvds_interface_ctrl3 = 0x00; /* no LVDS signal swap */
cfg.t2_delay = 1; /* Delay T2 (VDD to LVDS active) by 16 ms */
cfg.t3_timing = 5; /* 250 ms from LVDS to backlight active */
cfg.t12_timing = 20; /* 1 second re-power delay */
cfg.t4_timing = 3; /* 150 ms backlight off to LVDS inactive */
cfg.t5_delay = 1; /* Delay T5 (LVDS to VDD inactive) by 16 ms */
cfg.backlight_ctrl = 0; /* Enable backlight control */
/* Write back configuration data to PTN3460 */
status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF,
(u8*)&cfg, PTN_CONFIG_LEN);
if (status)
return (PTN_BUS_ERROR | status);
else
return PTN_NO_ERROR;
}
/** \brief This functions reads one desired EDID data structure from PTN3460
* @param edid_num Number of EDID that must be read (0..6)
* @param *data Pointer to a buffer where to store read data
* @return 0 on success or error code
*/
int ptn3460_read_edid(u8 edid_num, u8 *data)
{
int status;
if (edid_num > PTN_MAX_EDID_NUM)
return PTN_INVALID_EDID;
/* First enable access to the desired EDID table */
status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 5,
&edid_num, 1);
if (status)
return (PTN_BUS_ERROR | status);
/* Now we can simply read back EDID-data */
status = i2c_read(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_EDID_OFF,
data, PTN_EDID_LEN);
if (status)
return (PTN_BUS_ERROR | status);
else
return PTN_NO_ERROR;
}
/** \brief This functions writes one EDID data structure to PTN3460
* @param edid_num Number of EDID that must be written (0..6)
* @param *data Pointer to a buffer where data to write is stored in
* @return 0 on success or error code
*/
int ptn3460_write_edid(u8 edid_num, u8 *data)
{
int status;
if (edid_num > PTN_MAX_EDID_NUM)
return PTN_INVALID_EDID;
/* First enable access to the desired EDID table */
status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 5,
&edid_num, 1);
if (status)
return (PTN_BUS_ERROR | status);
/* Now we can simply write EDID-data to ptn3460 */
status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_EDID_OFF,
data, PTN_EDID_LEN);
if (status)
return (PTN_BUS_ERROR | status);
else
return PTN_NO_ERROR;
}
/** \brief This functions selects one of 7 EDID-tables inside PTN3460
* which should be emulated on display port and turn emulation ON
* @param edid_num Number of EDID to emulate (0..6)
* @return 0 on success or error code
*/
int ptn_select_edid (u8 edid_num)
{
int status;
u8 val;
if (edid_num > PTN_MAX_EDID_NUM)
return PTN_INVALID_EDID;
/* Enable emulation of the desired EDID table */
val = (edid_num << 1) | 1;
status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 4,
&val, 1);
if (status)
return (PTN_BUS_ERROR | status);
else
return PTN_NO_ERROR;
}
/** \brief This functions performs a flash operation which will write
* current configuration table (all the EDID-tables and the
* configuration space with a total amount of 1 KByte)
* to the internal flash of PTN3460
* @param none
* @return 0 on success or error code
*/
int ptn3460_flash_config(void)
{
int status;
struct ptn_3460_flash flash;
flash.cmd = 0x01; /* perform erase and flash cycle */
flash.magic = 0x7845; /* Magic number to protect flash operation */
flash.trigger = 0x56; /* This value starts flash operation */
status = i2c_write(PTN_I2C_CONTROLER, PTN_SLAVE_ADR, PTN_FLASH_CFG_OFF,
(u8*)&flash, PTN_FLASH_CFG_LEN);
if (status) {
return (PTN_BUS_ERROR | status);
} else {
/* To ensure the flash operation is finished, we have to wait 300 ms */
mdelay(300);
return PTN_NO_ERROR;
}
}
|
