diff options
Diffstat (limited to 'roms/u-boot/board/gdsys/common/dp501.c')
| -rw-r--r-- | roms/u-boot/board/gdsys/common/dp501.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/roms/u-boot/board/gdsys/common/dp501.c b/roms/u-boot/board/gdsys/common/dp501.c new file mode 100644 index 000000000..9ca69ebcb --- /dev/null +++ b/roms/u-boot/board/gdsys/common/dp501.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2012 + * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc + */ + +/* Parade Technologies Inc. DP501 DisplayPort DVI/HDMI Transmitter */ + +#ifdef CONFIG_GDSYS_LEGACY_DRIVERS + +#include <common.h> +#include <asm/io.h> +#include <errno.h> +#include <i2c.h> + +#define DP501_I2C_ADDR 0x08 + +#ifdef CONFIG_SYS_DP501_I2C +int dp501_i2c[] = CONFIG_SYS_DP501_I2C; +#endif + +#ifdef CONFIG_SYS_DP501_BASE +int dp501_base[] = CONFIG_SYS_DP501_BASE; +#endif + +static void dp501_setbits(u8 addr, u8 reg, u8 mask) +{ + u8 val; + + val = i2c_reg_read(addr, reg); + setbits_8(&val, mask); + i2c_reg_write(addr, reg, val); +} + +static void dp501_clrbits(u8 addr, u8 reg, u8 mask) +{ + u8 val; + + val = i2c_reg_read(addr, reg); + clrbits_8(&val, mask); + i2c_reg_write(addr, reg, val); +} + +static int dp501_detect_cable_adapter(u8 addr) +{ + u8 val = i2c_reg_read(addr, 0x00); + + return !(val & 0x04); +} + +static void dp501_link_training(u8 addr) +{ + u8 val; + u8 link_bw; + u8 max_lane_cnt; + u8 lane_cnt; + + val = i2c_reg_read(addr, 0x51); + if (val >= 0x0a) + link_bw = 0x0a; + else + link_bw = 0x06; + if (link_bw != val) + printf("DP sink supports %d Mbps link rate, set to %d Mbps\n", + val * 270, link_bw * 270); + i2c_reg_write(addr, 0x5d, link_bw); /* set link_bw */ + val = i2c_reg_read(addr, 0x52); + max_lane_cnt = val & 0x1f; + if (max_lane_cnt >= 4) + lane_cnt = 4; + else + lane_cnt = max_lane_cnt; + if (lane_cnt != max_lane_cnt) + printf("DP sink supports %d lanes, set to %d lanes\n", + max_lane_cnt, lane_cnt); + i2c_reg_write(addr, 0x5e, lane_cnt | (val & 0x80)); /* set lane_cnt */ + val = i2c_reg_read(addr, 0x53); + i2c_reg_write(addr, 0x5c, val); /* set downspread_ctl */ + + i2c_reg_write(addr, 0x5f, 0x0d); /* start training */ +} + +void dp501_powerup(u8 addr) +{ + dp501_clrbits(addr, 0x0a, 0x30); /* power on encoder */ + dp501_setbits(addr, 0x0a, 0x0e); /* block HDCP and MCCS on I2C bride*/ + i2c_reg_write(addr, 0x27, 0x30); /* Hardware auto detect DVO timing */ + dp501_setbits(addr, 0x72, 0x80); /* DPCD read enable */ + dp501_setbits(addr, 0x30, 0x20); /* RS polynomial select */ + i2c_reg_write(addr, 0x71, 0x20); /* Enable Aux burst write */ + dp501_setbits(addr, 0x78, 0x30); /* Disable HPD2 IRQ */ + dp501_clrbits(addr, 0x2f, 0x40); /* Link FIFO reset selection */ + dp501_clrbits(addr, 0x60, 0x20); /* Enable scrambling */ + +#ifdef CONFIG_SYS_DP501_VCAPCTRL0 + i2c_reg_write(addr, 0x24, CONFIG_SYS_DP501_VCAPCTRL0); +#else + i2c_reg_write(addr, 0x24, 0xc0); /* SDR mode 0, ext. H/VSYNC */ +#endif + +#ifdef CONFIG_SYS_DP501_DIFFERENTIAL + i2c_reg_write(addr + 2, 0x24, 0x10); /* clock input differential */ + i2c_reg_write(addr + 2, 0x25, 0x04); + i2c_reg_write(addr + 2, 0x26, 0x10); +#else + i2c_reg_write(addr + 2, 0x24, 0x02); /* clock input single ended */ +#endif + + i2c_reg_write(addr + 2, 0x1a, 0x04); /* SPDIF input method TTL */ + + i2c_reg_write(addr + 2, 0x00, 0x18); /* driving strength */ + i2c_reg_write(addr + 2, 0x03, 0x06); /* driving strength */ + i2c_reg_write(addr, 0x2c, 0x00); /* configure N value */ + i2c_reg_write(addr, 0x2d, 0x00); /* configure N value */ + i2c_reg_write(addr, 0x2e, 0x0c); /* configure N value */ + i2c_reg_write(addr, 0x76, 0xff); /* clear all interrupt */ + dp501_setbits(addr, 0x78, 0x03); /* clear all interrupt */ + i2c_reg_write(addr, 0x75, 0xf8); /* aux channel reset */ + i2c_reg_write(addr, 0x75, 0x00); /* clear aux channel reset */ + i2c_reg_write(addr, 0x87, 0x7f); /* set retry counter as 7 + retry interval 400us */ + + if (dp501_detect_cable_adapter(addr)) { + printf("DVI/HDMI cable adapter detected\n"); + i2c_reg_write(addr, 0x5e, 0x04); /* enable 4 channel */ + dp501_clrbits(addr, 0x00, 0x08); /* DVI/HDMI HDCP operation */ + } else { + printf("no DVI/HDMI cable adapter detected\n"); + dp501_setbits(addr, 0x00, 0x08); /* for DP HDCP operation */ + + dp501_link_training(addr); + } +} + +void dp501_powerdown(u8 addr) +{ + dp501_setbits(addr, 0x0a, 0x30); /* power down encoder, standby mode */ +} + + +int dp501_probe(unsigned screen, bool power) +{ +#ifdef CONFIG_SYS_DP501_BASE + uint8_t dp501_addr = dp501_base[screen]; +#else + uint8_t dp501_addr = DP501_I2C_ADDR; +#endif + +#ifdef CONFIG_SYS_DP501_I2C + i2c_set_bus_num(dp501_i2c[screen]); +#endif + + if (i2c_probe(dp501_addr)) + return -1; + + dp501_powerup(dp501_addr); + + return 0; +} + +#endif /* CONFIG_GDSYS_LEGACY_DRIVERS */ |