1 /*
2 * (C) Copyright 2012
3 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 /* Parade Technologies Inc. DP501 DisplayPort DVI/HDMI Transmitter */
9
10 #include <common.h>
11 #include <asm/io.h>
12 #include <errno.h>
13 #include <i2c.h>
14
15 #define DP501_I2C_ADDR 0x08
16
17 #ifdef CONFIG_SYS_DP501_I2C
18 int dp501_i2c[] = CONFIG_SYS_DP501_I2C;
19 #endif
20
21 #ifdef CONFIG_SYS_DP501_BASE
22 int dp501_base[] = CONFIG_SYS_DP501_BASE;
23 #endif
24
dp501_setbits(u8 addr,u8 reg,u8 mask)25 static void dp501_setbits(u8 addr, u8 reg, u8 mask)
26 {
27 u8 val;
28
29 val = i2c_reg_read(addr, reg);
30 setbits_8(&val, mask);
31 i2c_reg_write(addr, reg, val);
32 }
33
dp501_clrbits(u8 addr,u8 reg,u8 mask)34 static void dp501_clrbits(u8 addr, u8 reg, u8 mask)
35 {
36 u8 val;
37
38 val = i2c_reg_read(addr, reg);
39 clrbits_8(&val, mask);
40 i2c_reg_write(addr, reg, val);
41 }
42
dp501_detect_cable_adapter(u8 addr)43 static int dp501_detect_cable_adapter(u8 addr)
44 {
45 u8 val = i2c_reg_read(addr, 0x00);
46
47 return !(val & 0x04);
48 }
49
dp501_link_training(u8 addr)50 static void dp501_link_training(u8 addr)
51 {
52 u8 val;
53 u8 link_bw;
54 u8 max_lane_cnt;
55 u8 lane_cnt;
56
57 val = i2c_reg_read(addr, 0x51);
58 if (val >= 0x0a)
59 link_bw = 0x0a;
60 else
61 link_bw = 0x06;
62 if (link_bw != val)
63 printf("DP sink supports %d Mbps link rate, set to %d Mbps\n",
64 val * 270, link_bw * 270);
65 i2c_reg_write(addr, 0x5d, link_bw); /* set link_bw */
66 val = i2c_reg_read(addr, 0x52);
67 max_lane_cnt = val & 0x1f;
68 if (max_lane_cnt >= 4)
69 lane_cnt = 4;
70 else
71 lane_cnt = max_lane_cnt;
72 if (lane_cnt != max_lane_cnt)
73 printf("DP sink supports %d lanes, set to %d lanes\n",
74 max_lane_cnt, lane_cnt);
75 i2c_reg_write(addr, 0x5e, lane_cnt | (val & 0x80)); /* set lane_cnt */
76 val = i2c_reg_read(addr, 0x53);
77 i2c_reg_write(addr, 0x5c, val); /* set downspread_ctl */
78
79 i2c_reg_write(addr, 0x5f, 0x0d); /* start training */
80 }
81
dp501_powerup(u8 addr)82 void dp501_powerup(u8 addr)
83 {
84 dp501_clrbits(addr, 0x0a, 0x30); /* power on encoder */
85 dp501_setbits(addr, 0x0a, 0x0e); /* block HDCP and MCCS on I2C bride*/
86 i2c_reg_write(addr, 0x27, 0x30); /* Hardware auto detect DVO timing */
87 dp501_setbits(addr, 0x72, 0x80); /* DPCD read enable */
88 dp501_setbits(addr, 0x30, 0x20); /* RS polynomial select */
89 i2c_reg_write(addr, 0x71, 0x20); /* Enable Aux burst write */
90 dp501_setbits(addr, 0x78, 0x30); /* Disable HPD2 IRQ */
91 dp501_clrbits(addr, 0x2f, 0x40); /* Link FIFO reset selection */
92 dp501_clrbits(addr, 0x60, 0x20); /* Enable scrambling */
93
94 #ifdef CONFIG_SYS_DP501_VCAPCTRL0
95 i2c_reg_write(addr, 0x24, CONFIG_SYS_DP501_VCAPCTRL0);
96 #else
97 i2c_reg_write(addr, 0x24, 0xc0); /* SDR mode 0, ext. H/VSYNC */
98 #endif
99
100 #ifdef CONFIG_SYS_DP501_DIFFERENTIAL
101 i2c_reg_write(addr + 2, 0x24, 0x10); /* clock input differential */
102 i2c_reg_write(addr + 2, 0x25, 0x04);
103 i2c_reg_write(addr + 2, 0x26, 0x10);
104 #else
105 i2c_reg_write(addr + 2, 0x24, 0x02); /* clock input single ended */
106 #endif
107
108 i2c_reg_write(addr + 2, 0x1a, 0x04); /* SPDIF input method TTL */
109
110 i2c_reg_write(addr + 2, 0x00, 0x18); /* driving strength */
111 i2c_reg_write(addr + 2, 0x03, 0x06); /* driving strength */
112 i2c_reg_write(addr, 0x2c, 0x00); /* configure N value */
113 i2c_reg_write(addr, 0x2d, 0x00); /* configure N value */
114 i2c_reg_write(addr, 0x2e, 0x0c); /* configure N value */
115 i2c_reg_write(addr, 0x76, 0xff); /* clear all interrupt */
116 dp501_setbits(addr, 0x78, 0x03); /* clear all interrupt */
117 i2c_reg_write(addr, 0x75, 0xf8); /* aux channel reset */
118 i2c_reg_write(addr, 0x75, 0x00); /* clear aux channel reset */
119 i2c_reg_write(addr, 0x87, 0x7f); /* set retry counter as 7
120 retry interval 400us */
121
122 if (dp501_detect_cable_adapter(addr)) {
123 printf("DVI/HDMI cable adapter detected\n");
124 i2c_reg_write(addr, 0x5e, 0x04); /* enable 4 channel */
125 dp501_clrbits(addr, 0x00, 0x08); /* DVI/HDMI HDCP operation */
126 } else {
127 printf("no DVI/HDMI cable adapter detected\n");
128 dp501_setbits(addr, 0x00, 0x08); /* for DP HDCP operation */
129
130 dp501_link_training(addr);
131 }
132 }
133
dp501_powerdown(u8 addr)134 void dp501_powerdown(u8 addr)
135 {
136 dp501_setbits(addr, 0x0a, 0x30); /* power down encoder, standby mode */
137 }
138
139
dp501_probe(unsigned screen,bool power)140 int dp501_probe(unsigned screen, bool power)
141 {
142 #ifdef CONFIG_SYS_DP501_BASE
143 uint8_t dp501_addr = dp501_base[screen];
144 #else
145 uint8_t dp501_addr = DP501_I2C_ADDR;
146 #endif
147
148 #ifdef CONFIG_SYS_DP501_I2C
149 i2c_set_bus_num(dp501_i2c[screen]);
150 #endif
151
152 if (i2c_probe(dp501_addr))
153 return -1;
154
155 dp501_powerup(dp501_addr);
156
157 return 0;
158 }
159