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 static void dp501_setbits(u8 addr, u8 reg, u8 mask) 16 { 17 u8 val; 18 19 val = i2c_reg_read(addr, reg); 20 setbits_8(&val, mask); 21 i2c_reg_write(addr, reg, val); 22 } 23 24 static void dp501_clrbits(u8 addr, u8 reg, u8 mask) 25 { 26 u8 val; 27 28 val = i2c_reg_read(addr, reg); 29 clrbits_8(&val, mask); 30 i2c_reg_write(addr, reg, val); 31 } 32 33 static int dp501_detect_cable_adapter(u8 addr) 34 { 35 u8 val = i2c_reg_read(addr, 0x00); 36 37 return !(val & 0x04); 38 } 39 40 static void dp501_link_training(u8 addr) 41 { 42 u8 val; 43 44 val = i2c_reg_read(addr, 0x51); 45 i2c_reg_write(addr, 0x5d, val); /* set link_bw */ 46 val = i2c_reg_read(addr, 0x52); 47 i2c_reg_write(addr, 0x5e, val); /* set lane_cnt */ 48 val = i2c_reg_read(addr, 0x53); 49 i2c_reg_write(addr, 0x5c, val); /* set downspread_ctl */ 50 51 i2c_reg_write(addr, 0x5f, 0x0d); /* start training */ 52 } 53 54 void dp501_powerup(u8 addr) 55 { 56 dp501_clrbits(addr, 0x0a, 0x30); /* power on encoder */ 57 i2c_reg_write(addr, 0x27, 0x30); /* Hardware auto detect DVO timing */ 58 dp501_setbits(addr, 0x72, 0x80); /* DPCD read enable */ 59 dp501_setbits(addr, 0x30, 0x20); /* RS polynomial select */ 60 i2c_reg_write(addr, 0x71, 0x20); /* Enable Aux burst write */ 61 dp501_setbits(addr, 0x78, 0x30); /* Disable HPD2 IRQ */ 62 dp501_clrbits(addr, 0x2f, 0x40); /* Link FIFO reset selection */ 63 64 #ifdef CONFIG_SYS_DP501_VCAPCTRL0 65 i2c_reg_write(addr, 0x24, CONFIG_SYS_DP501_VCAPCTRL0); 66 #else 67 i2c_reg_write(addr, 0x24, 0xc0); /* SDR mode 0, ext. H/VSYNC */ 68 #endif 69 70 #ifdef CONFIG_SYS_DP501_DIFFERENTIAL 71 i2c_reg_write(addr + 2, 0x24, 0x10); /* clock input differential */ 72 i2c_reg_write(addr + 2, 0x25, 0x04); 73 i2c_reg_write(addr + 2, 0x26, 0x10); 74 #else 75 i2c_reg_write(addr + 2, 0x24, 0x02); /* clock input single ended */ 76 #endif 77 78 i2c_reg_write(addr + 2, 0x00, 0x18); /* driving strength */ 79 i2c_reg_write(addr + 2, 0x03, 0x06); /* driving strength */ 80 i2c_reg_write(addr, 0x2c, 0x00); /* configure N value */ 81 i2c_reg_write(addr, 0x2d, 0x00); /* configure N value */ 82 i2c_reg_write(addr, 0x2e, 0x0c); /* configure N value */ 83 i2c_reg_write(addr, 0x76, 0xff); /* clear all interrupt */ 84 dp501_setbits(addr, 0x78, 0x03); /* clear all interrupt */ 85 i2c_reg_write(addr, 0x75, 0xf8); /* aux channel reset */ 86 i2c_reg_write(addr, 0x75, 0x00); /* clear aux channel reset */ 87 i2c_reg_write(addr, 0x87, 0x70); /* set retry counter as 7 */ 88 89 if (dp501_detect_cable_adapter(addr)) { 90 printf("DVI/HDMI cable adapter detected\n"); 91 i2c_reg_write(addr, 0x5e, 0x04); /* enable 4 channel */ 92 dp501_clrbits(addr, 0x00, 0x08); /* DVI/HDMI HDCP operation */ 93 } else { 94 printf("no DVI/HDMI cable adapter detected\n"); 95 dp501_setbits(addr, 0x00, 0x08); /* for DP HDCP operation */ 96 97 dp501_link_training(addr); 98 } 99 } 100 101 void dp501_powerdown(u8 addr) 102 { 103 dp501_setbits(addr, 0x0a, 0x30); /* power down encoder, standby mode */ 104 } 105