/* * This file is part of the coreboot project. * * Copyright (C) 2014 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 #include #include #include #include #include "soc/i2c.h" #include "ptn3460.h" /** \brief This functions 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 error code */ int ptn3460_init(char *hwi_block) { struct ptn_3460_config cfg; int status; uint8_t disp_con = 0, color_depth = 0; uint8_t edid_data[0x80]; uint8_t hwid[4], tcu31_hwid[4] = {7, 9, 2, 0}; if (!hwi_block || hwilib_find_blocks(hwi_block) != CB_SUCCESS) { printk(BIOS_ERR, "LCD: Info block \"%s\" not found!\n", hwi_block); return 1; } status = i2c_init(PTN_I2C_CONTROLLER); if (status) return (PTN_BUS_ERROR | status); /* Get all needed information from hwinfo block */ if (hwilib_get_field(Edid, edid_data, 0x80) != 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, 1) != 1)) { printk(BIOS_ERR, "LCD: Missing panel features from %s\n", hwi_block); return 1; } if (hwilib_get_field(PF_Color_Depth, &color_depth, 1) != 1) { printk(BIOS_ERR, "LCD: Missing panel features from %s\n", hwi_block); return 1; } /* Here, all the desired information for setting up DP2LVDS converter*/ /* are present. Inside the converter, table 6 will be used for */ /* the timings. */ if ((status = ptn3460_write_edid(6, edid_data)) != 0) return status; /* Select this table to be emulated */ ptn_select_edid(6); /* Read PTN configuration data */ status = i2c_read(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF, (u8*)&cfg, PTN_CONFIG_LEN); if (status) return (PTN_BUS_ERROR | status); /* Set up configuration data according to the hwinfo blocks we get */ cfg.dp_interface_ctrl = 0; cfg.lvds_interface_ctrl1 = 0x00; if (disp_con == PF_DISPLCON_LVDS_DUAL) cfg.lvds_interface_ctrl1 |= 0x0b; /* Turn on dual LVDS lane and clock */ if (color_depth == PF_COLOR_DEPTH_6BIT) cfg.lvds_interface_ctrl1 |= 0x20; /* Use 18 bits per pixel */ cfg.lvds_interface_ctrl2 = 0x03; /* no clock spreading, 300 mV LVDS swing */ /* Swap LVDS even and odd lanes for HW-ID 7.9.2.0 only. */ if (hwilib_get_field(HWID, hwid, sizeof(hwid)) == sizeof(hwid) && !(memcmp(hwid, tcu31_hwid, sizeof(hwid)))) { cfg.lvds_interface_ctrl3 = 0x01; /* swap LVDS even and odd */ } else cfg.lvds_interface_ctrl3 = 0x00; /* no LVDS signal swap */ cfg.t2_delay = 1; /* Delay T2 (VDD to LVDS active) by 16 ms */ cfg.t3_timing = 10; /* 500 ms from LVDS to backlight active */ cfg.t12_timing = 20; /* 1 second re-power delay */ cfg.t4_timing = 3; /* 150 ms backlight off to LVDS inactive */ cfg.t5_delay = 1; /* Delay T5 (LVDS to VDD inactive) by 16 ms */ cfg.backlight_ctrl = 0; /* Enable backlight control */ /* Write back configuration data to PTN3460 */ status = i2c_write(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF, (u8*)&cfg, PTN_CONFIG_LEN); if (status) return (PTN_BUS_ERROR | status); else return PTN_NO_ERROR; } /** \brief This functions reads one desired EDID data structure from PTN3460 * @param edid_num Number of EDID that must be read (0..6) * @param *data Pointer to a buffer where to store read data * @return 0 on success or error code */ int ptn3460_read_edid(u8 edid_num, u8 *data) { int status; if (edid_num > PTN_MAX_EDID_NUM) return PTN_INVALID_EDID; /* First enable access to the desired EDID table */ status = i2c_write(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 5, &edid_num, 1); if (status) return (PTN_BUS_ERROR | status); /* Now we can simply read back EDID-data */ status = i2c_read(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_EDID_OFF, data, PTN_EDID_LEN); if (status) return (PTN_BUS_ERROR | status); else return PTN_NO_ERROR; } /** \brief This functions writes one EDID data 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(u8 edid_num, u8 *data) { int status; if (edid_num > PTN_MAX_EDID_NUM) return PTN_INVALID_EDID; /* First enable access to the desired EDID table */ status = i2c_write(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 5, &edid_num, 1); if (status) return (PTN_BUS_ERROR | status); /* Now we can simply write EDID-data to ptn3460 */ status = i2c_write(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_EDID_OFF, data, PTN_EDID_LEN); if (status) return (PTN_BUS_ERROR | status); else return PTN_NO_ERROR; } /** \brief This functions selects one of 7 EDID-tables inside PTN3460 * which should be emulated on display port 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 (u8 edid_num) { int status; u8 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_write(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_CONFIG_OFF + 4, &val, 1); if (status) return (PTN_BUS_ERROR | status); else return PTN_NO_ERROR; } /** \brief This functions performs a flash operation which will write * current configuration table (all the EDID-tables and the * configuration space with a total amount of 1 KByte) * to the internal flash of PTN3460 * @param none * @return 0 on success or error code */ int ptn3460_flash_config(void) { int status; struct ptn_3460_flash flash; flash.cmd = 0x01; /* perform erase and flash cycle */ flash.magic = 0x7845; /* Magic number to protect flash operation */ flash.trigger = 0x56; /* This value starts flash operation */ status = i2c_write(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR, PTN_FLASH_CFG_OFF, (u8*)&flash, PTN_FLASH_CFG_LEN); if (status) { return (PTN_BUS_ERROR | status); } else { /* To ensure the flash operation is finished, we have to wait 300 ms */ mdelay(300); return PTN_NO_ERROR; } }