/* SPDX-License-Identifier: GPL-2.0-only */ /* This file is part of the coreboot project. */ #include #include #include #include #include #include "chip.h" /* Chip commands */ #define RTD2132_COMMAND 0x01 #define RTD2132_DATA 0x00 #define RTD2132_FIRMWARE 0x80 #define RTD2132_FIRMWARE_START 0x00 #define RTD2132_FIRMWARE_STOP 0x01 /* Panel Power Sequence Timing Registers. */ #define RTD2132_COMMAND_PWR_SEQ_T1 0x32 /* 1ms units. */ #define RTD2132_COMMAND_PWR_SEQ_T2 0x33 /* 4ms units. */ #define RTD2132_COMMAND_PWR_SEQ_T3 0x34 /* 1ms units. */ #define RTD2132_COMMAND_PWR_SEQ_T4 0x35 /* 1ms units. */ #define RTD2132_COMMAND_PWR_SEQ_T5 0x36 /* 4ms units. */ #define RTD2132_COMMAND_PWR_SEQ_T6 0x37 /* 1ms units. */ #define RTD2132_COMMAND_PWR_SEQ_T7 0x38 /* 4ms units. */ /* Spread spectrum configuration */ #define RTD2132_COMMAND_SSCG_CONFIG_0 0x39 #define RTD2132_SSCG_ENABLE 0xa0 #define RTD2132_SSCG_DISABLE 0x20 #define RTD2132_COMMAND_SSCG_CONFIG_1 0x3a #define RTD2132_SSCG_CONFIG_DISABLED 0x01 /* DISABLED */ #define RTD2132_SSCG_CONFIG_0_5 0x07 /* 0.5% */ #define RTD2132_SSCG_CONFIG_1_0 0x0f /* 1.0% */ #define RTD2132_SSCG_CONFIG_1_5 0x16 /* 1.5% */ /* LVDS Swap */ #define RTD2132_COMMAND_LVDS_SWAP 0x3b #define RTD2132_LVDS_SWAP_DUAL 0x80 #define RTD2132_LVDS_SWAP_NORMAL 0x04 #define RTD2132_LVDS_SWAP_MIRROR 0x14 #define RTD2132_LVDS_SWAP_P_N 0x24 #define RTD2132_LVDS_SWAP_MIRROR_P_N 0x34 #define RTD2132_LVDS_SWAP_R_L 0x0c /* Configuration values from devicetree */ #define RTD2132_SSCG_PERCENT_0_0 0x00 /* DISABLED */ #define RTD2132_SSCG_PERCENT_0_5 0x05 /* 0.5% */ #define RTD2132_SSCG_PERCENT_1_0 0x10 /* 1.0% */ #define RTD2132_SSCG_PERCENT_1_5 0x15 /* 1.5% */ #define RTD2132_LVDS_SWAP_CFG_DUAL 0x80 #define RTD2132_LVDS_SWAP_CFG_NORMAL 0x00 #define RTD2132_LVDS_SWAP_CFG_MIRROR 0x01 #define RTD2132_LVDS_SWAP_CFG_P_N 0x02 #define RTD2132_LVDS_SWAP_CFG_MIRROR_P_N 0x03 #define RTD2132_LVDS_SWAP_CFG_R_L 0x04 #define RTD2132_DEBUG_REG 0 static void rtd2132_write_reg(struct device *dev, u8 reg, u8 value) { if (RTD2132_DEBUG_REG) printk(BIOS_DEBUG, "RTD2132 0x%02x <- 0x%02x\n", reg, value); smbus_write_byte(dev, RTD2132_COMMAND, reg); smbus_write_byte(dev, RTD2132_DATA, value); } static void rtd2132_firmware_stop(struct device *dev) { smbus_write_byte(dev, RTD2132_FIRMWARE, RTD2132_FIRMWARE_STOP); mdelay(60); } static void rtd2132_firmware_start(struct device *dev) { smbus_write_byte(dev, RTD2132_FIRMWARE, RTD2132_FIRMWARE_START); } static void rtd2132_pps(struct device *dev, struct drivers_i2c_rtd2132_config *cfg) { /* T2, T5, and T7 register values are in units of 4ms. */ rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T1, cfg->t1); rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T2, cfg->t2 / 4); rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T3, cfg->t3); rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T4, cfg->t4); rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T5, cfg->t5 / 4); rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T6, cfg->t6); rtd2132_write_reg(dev, RTD2132_COMMAND_PWR_SEQ_T7, cfg->t7 / 4); } static void rtd2132_sscg_enable(struct device *dev, u8 sscg_percent) { /* SSCG_Config_0 */ rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_0, RTD2132_SSCG_ENABLE); /* SSCG_Config_1 */ rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_1, sscg_percent); } static void rtd2132_sscg_disable(struct device *dev) { /* SSCG_Config_0 */ rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_0, RTD2132_SSCG_DISABLE); /* SSCG_Config_1 */ rtd2132_write_reg(dev, RTD2132_COMMAND_SSCG_CONFIG_1, RTD2132_SSCG_CONFIG_DISABLED); } static void rtd2132_sscg(struct device *dev, struct drivers_i2c_rtd2132_config *cfg) { switch (cfg->sscg_percent) { case RTD2132_SSCG_PERCENT_0_0: printk(BIOS_INFO, "RTD2132: Disable Spread Spectrum\n"); rtd2132_sscg_disable(dev); break; case RTD2132_SSCG_PERCENT_0_5: printk(BIOS_INFO, "RTD2132: Enable 0.5%% Spread Spectrum\n"); rtd2132_sscg_enable(dev, RTD2132_SSCG_CONFIG_0_5); break; case RTD2132_SSCG_PERCENT_1_0: printk(BIOS_INFO, "RTD2132: Enable 1.0%% Spread Spectrum\n"); rtd2132_sscg_enable(dev, RTD2132_SSCG_CONFIG_1_0); break; case RTD2132_SSCG_PERCENT_1_5: printk(BIOS_INFO, "RTD2132: Enable 1.5%% Spread Spectrum\n"); rtd2132_sscg_enable(dev, RTD2132_SSCG_CONFIG_1_5); break; default: printk(BIOS_ERR, "RTD2132: Invalid Spread Spectrum 0x%02x\n", cfg->sscg_percent); } } static void rtd2132_lvds_swap(struct device *dev, struct drivers_i2c_rtd2132_config *cfg) { u8 swap_value = RTD2132_LVDS_SWAP_NORMAL; switch (cfg->lvds_swap & ~RTD2132_LVDS_SWAP_CFG_DUAL) { case RTD2132_LVDS_SWAP_CFG_NORMAL: swap_value = RTD2132_LVDS_SWAP_NORMAL; break; case RTD2132_LVDS_SWAP_CFG_MIRROR: swap_value = RTD2132_LVDS_SWAP_MIRROR; break; case RTD2132_LVDS_SWAP_CFG_P_N: swap_value = RTD2132_LVDS_SWAP_P_N; break; case RTD2132_LVDS_SWAP_CFG_MIRROR_P_N: swap_value = RTD2132_LVDS_SWAP_MIRROR_P_N; break; case RTD2132_LVDS_SWAP_CFG_R_L: swap_value = RTD2132_LVDS_SWAP_R_L; break; default: printk(BIOS_ERR, "RTD2132: Invalid LVDS swap value 0x%02x\n", cfg->lvds_swap); } if (cfg->lvds_swap & RTD2132_LVDS_SWAP_CFG_DUAL) swap_value |= RTD2132_LVDS_SWAP_DUAL; printk(BIOS_INFO, "RTD2132: LVDS Swap 0x%02x\n", swap_value); rtd2132_write_reg(dev, RTD2132_COMMAND_LVDS_SWAP, swap_value); } static void rtd2132_defaults(struct device *dev) { static const struct def_setting { u8 reg; u8 value; } def_settings[] = { { 0x3c, 0x06 }, { 0x3d, 0x38 }, { 0x3e, 0x73 }, { 0x3f, 0x33 }, { 0x06, 0x90 }, { 0x06, 0xb0 }, { 0x06, 0x80 }, }; int i; for (i = 0; i < ARRAY_SIZE(def_settings); i++) rtd2132_write_reg(dev, def_settings[i].reg, def_settings[i].value); } static void rtd2132_setup(struct device *dev) { struct drivers_i2c_rtd2132_config *config = dev->chip_info; if (!config) return; /* Stop running firmware */ rtd2132_firmware_stop(dev); /* Panel Power Sequencing Settings. */ rtd2132_pps(dev, config); /* Spread spectrum configuration */ rtd2132_sscg(dev, config); /* LVDS Swap Setting. */ rtd2132_lvds_swap(dev, config); /* Default settings. */ rtd2132_defaults(dev); /* Start firmware */ rtd2132_firmware_start(dev); } static void rtd2132_init(struct device *dev) { if (dev->enabled && dev->path.type == DEVICE_PATH_I2C && ops_smbus_bus(get_pbus_smbus(dev))) { rtd2132_setup(dev); } } static struct device_operations rtd2132_operations = { .read_resources = noop_read_resources, .set_resources = noop_set_resources, .init = rtd2132_init, }; static void enable_dev(struct device *dev) { dev->ops = &rtd2132_operations; } struct chip_operations drivers_i2c_rtd2132_ops = { CHIP_NAME("Realtek RTD2132 LVDS Bridge") .enable_dev = enable_dev, };