| Dirk Eibach | 762d3df | 2013-06-26 15:55:17 +0200 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2012 |
| 3 | * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc |
| 4 | * |
| Tom Rini | be314fa | 2013-07-26 15:32:59 -0400 | [diff] [blame] | 5 | * SPDX-License-Identifier: GPL-2.0+ |
| Dirk Eibach | 762d3df | 2013-06-26 15:55:17 +0200 | [diff] [blame] | 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 | i2c_reg_write(addr, 0x24, 0xc0); /* SDR mode 0, ext. H/VSYNC */ |
| 64 | i2c_reg_write(addr + 2, 0x24, 0x02); /* clock input single ended */ |
| 65 | |
| 66 | if (dp501_detect_cable_adapter(addr)) { |
| 67 | printf("DVI/HDMI cable adapter detected\n"); |
| 68 | i2c_reg_write(addr, 0x5e, 0x04); /* enable 4 channel */ |
| 69 | dp501_clrbits(addr, 0x00, 0x08); /* DVI/HDMI HDCP operation */ |
| 70 | } else { |
| 71 | printf("no DVI/HDMI cable adapter detected\n"); |
| 72 | i2c_reg_write(addr + 2, 0x00, 0x18); /* driving strength */ |
| 73 | i2c_reg_write(addr + 2, 0x03, 0x06); /* driving strength */ |
| 74 | i2c_reg_write(addr, 0x2c, 0x00); /* configure N value */ |
| 75 | i2c_reg_write(addr, 0x2d, 0x00); /* configure N value */ |
| 76 | i2c_reg_write(addr, 0x2e, 0x0c); /* configure N value */ |
| 77 | i2c_reg_write(addr, 0x76, 0xff); /* clear all interrupt */ |
| 78 | dp501_setbits(addr, 0x78, 0x03); /* clear all interrupt */ |
| 79 | i2c_reg_write(addr, 0x75, 0xf8); /* aux channel reset */ |
| 80 | i2c_reg_write(addr, 0x75, 0x00); /* clear aux channel reset */ |
| 81 | i2c_reg_write(addr, 0x87, 0x70); /* set retry counter as 7 */ |
| 82 | dp501_setbits(addr, 0x00, 0x08); /* for DP HDCP operation */ |
| 83 | |
| 84 | dp501_link_training(addr); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | void dp501_powerdown(u8 addr) |
| 89 | { |
| 90 | dp501_setbits(addr, 0x0a, 0x30); /* power down encoder, standby mode */ |
| 91 | } |