| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2014-2017 Siemens AG |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <console/console.h> |
| #include <lib.h> |
| #include <hwilib.h> |
| #include <device/i2c_simple.h> |
| #include <variant/ptn3460.h> |
| |
| /** |
| * This function sets up the DP2LVDS-converter to be used with the appropriate |
| * lcd panel. |
| * |
| * @param *hwi_block Filename in CBFS of the block to use as HW-Info. |
| * @return 0 on success or HWI-Data/PTN error code. |
| */ |
| int ptn3460_init(const char *hwi_block) |
| { |
| struct ptn_3460_config cfg; |
| int status; |
| uint8_t disp_con = 0, color_depth = 0; |
| uint8_t edid_data[PTN_EDID_LEN]; |
| int i; |
| |
| if (!hwi_block || hwilib_find_blocks(hwi_block) != CB_SUCCESS) { |
| printk(BIOS_ERR, "LCD: Info block \"%s\" not found!\n", |
| hwi_block); |
| return 1; |
| } |
| /* Get all needed information from hwinfo block. */ |
| if (hwilib_get_field(Edid, edid_data, sizeof(edid_data)) != |
| sizeof(edid_data)) { |
| printk(BIOS_ERR, "LCD: No EDID data available in %s\n", |
| hwi_block); |
| return 1; |
| } |
| if ((hwilib_get_field(PF_DisplCon, &disp_con, sizeof(disp_con)) != |
| sizeof(disp_con))) { |
| printk(BIOS_ERR, "LCD: Missing panel features from %s\n", |
| hwi_block); |
| return 1; |
| } |
| if (hwilib_get_field(PF_Color_Depth, &color_depth, sizeof(color_depth)) |
| != sizeof(color_depth)) { |
| printk(BIOS_ERR, "LCD: Missing panel features from %s\n", |
| hwi_block); |
| return 1; |
| } |
| /* |
| * Here, all the desired information for setting up DP2LVDS converter |
| * is present. Inside the converter, table 6 will be used for the |
| * timings. |
| */ |
| status = ptn3460_write_edid(6, edid_data); |
| if (status) |
| return status; |
| /* Select this table to be emulated. */ |
| ptn_select_edid(6); |
| /* Read PTN configuration data. */ |
| status = i2c_read_bytes(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, |
| PTN_CONFIG_OFF, (uint8_t *)&cfg, |
| sizeof(cfg)); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| /* Set up configuration data according to the hwinfo block we get. */ |
| cfg.dp_interface_ctrl = 0; |
| cfg.lvds_interface_ctrl1 = 0x00; |
| if (disp_con == PF_DISPLCON_LVDS_DUAL) |
| /* Turn on dual LVDS lane and clock. */ |
| cfg.lvds_interface_ctrl1 |= 0x0b; |
| if (color_depth == PF_COLOR_DEPTH_6BIT) |
| /* Use 18 bits per pixel. */ |
| cfg.lvds_interface_ctrl1 |= 0x20; |
| |
| /* 1 % clock spreading, 300 mV LVDS swing. */ |
| cfg.lvds_interface_ctrl2 = 0x13; |
| /* No LVDS signal swap. */ |
| cfg.lvds_interface_ctrl3 = 0x00; |
| /* Delay T2 (VDD to LVDS active) by 16 ms. */ |
| cfg.t2_delay = 1; |
| /* 250 ms from LVDS to backlight active. */ |
| cfg.t3_timing = 10; |
| /* 1 second re-power delay. */ |
| cfg.t12_timing = 20; |
| /* 150 ms backlight off to LVDS inactive. */ |
| cfg.t4_timing = 3; |
| /* Delay T5 (LVDS to VDD inactive) by 16 ms. */ |
| cfg.t5_delay = 1; |
| /* Enable backlight control. */ |
| cfg.backlight_ctrl = 0; |
| |
| /* Write back configuration data to PTN3460. */ |
| for (i = 0; i < sizeof(struct ptn_3460_config); i++) { |
| status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, |
| PTN_CONFIG_OFF+i, |
| *(((uint8_t *)&cfg)+i)); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| } |
| |
| return PTN_NO_ERROR; |
| } |
| |
| /** |
| * This function writes one Extended Display Identification Data (EDID) |
| * structure to PTN3460. |
| * |
| * @param edid_num Number of EDID that must be written (0..6). |
| * @param *data Pointer to a buffer where data to write is stored in. |
| * @return 0 on success or error code. |
| */ |
| int ptn3460_write_edid(uint8_t edid_num, const uint8_t data[PTN_EDID_LEN]) |
| { |
| int status; |
| int i; |
| |
| if (edid_num > PTN_MAX_EDID_NUM) |
| return PTN_INVALID_EDID; |
| |
| /* First enable access to the desired EDID table. */ |
| status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, |
| PTN_CONFIG_OFF + 5, edid_num); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| |
| /* Now we can simply write EDID-data to ptn3460. */ |
| for (i = 0; i < PTN_EDID_LEN; i++) { |
| status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, |
| PTN_EDID_OFF + i, data[i]); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| } |
| |
| return PTN_NO_ERROR; |
| } |
| |
| /** |
| * This function selects one of 7 EDID-tables inside PTN3460 which should be |
| * emulated on DisplayPort and turn emulation ON. |
| * |
| * @param edid_num Number of EDID to emulate (0..6). |
| * @return 0 on success or error code. |
| */ |
| int ptn_select_edid(uint8_t edid_num) |
| { |
| int status; |
| uint8_t val; |
| |
| if (edid_num > PTN_MAX_EDID_NUM) |
| return PTN_INVALID_EDID; |
| /* Enable emulation of the desired EDID table. */ |
| val = (edid_num << 1) | 1; |
| status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, |
| PTN_CONFIG_OFF + 4, val); |
| if (status) |
| return (PTN_BUS_ERROR | status); |
| else |
| return PTN_NO_ERROR; |
| } |