siemens/mc_apl1: Activate PTN3460 eDP to LVDS bridge IC
This mainboard uses a LVDS connection for LCD panels. Apollo Lake SoC provides a display controller with three independent pipes (1x eDP and 2x DP/HDMI). PTN3460 is an embedded DisplayPort to LVDS bridge device that enables connectivity between an eDP source and LVDS display panel (http://www.nxp.com/documents/data_sheet/PTN3460.pdf). The bridge contains an On-chip Extended Display Identification Data (EDIT) emulation for EDIT data structures. This patch sets up PTN3460 to be used with the appropriate LCD panel. Change-Id: Ib8fa79bb608f1842f26c1af3d7bf4bb0513fa94d Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com> Reviewed-on: https://review.coreboot.org/19043 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Mario Scheithauer
Werner Zeh
parent
45ff9cbaa9
commit
956a9f6a9c
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@ -8,3 +8,4 @@ romstage-y += gpio.c
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ramstage-y += mainboard.c
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ramstage-y += gpio.c
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ramstage-y += ptn3460.c
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@ -14,12 +14,15 @@
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* GNU General Public License for more details.
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*/
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#include <device/pci.h>
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#include <device/device.h>
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#include <console/console.h>
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#include <soc/pci_devs.h>
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#include <string.h>
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#include <hwilib.h>
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#include <i210.h>
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#include "brd_gpio.h"
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#include "ptn3460.h"
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#define MAX_PATH_DEPTH 12
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#define MAX_NUM_MAPPINGS 10
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@ -108,6 +111,22 @@ static void mainboard_init(void *chip_info)
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gpio_configure_pads(pads, num);
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}
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static void mainboard_final(void *chip_info)
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{
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int status;
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/**
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* Set up the DP2LVDS converter.
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* ptn3460_init() may only be executed after i2c bus init.
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*/
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status = ptn3460_init("hwinfo.hex");
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if (status)
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printk(BIOS_ERR, "LCD: Set up PTN with status 0x%x\n", status);
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else
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printk(BIOS_INFO, "LCD: Set up PTN was successful.\n");
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}
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struct chip_operations mainboard_ops = {
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.init = mainboard_init,
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.final = mainboard_final,
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};
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@ -0,0 +1,178 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2014-2017 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <console/console.h>
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#include <lib.h>
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#include <hwilib.h>
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#include <device/i2c.h>
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#include <soc/i2c.h>
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#include "ptn3460.h"
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/**
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* This function sets up the DP2LVDS-converter to be used with the appropriate
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* lcd panel.
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*
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* @param *hwi_block Filename in CBFS of the block to use as HW-Info.
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* @return 0 on success or HWI-Data/PTN error code.
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*/
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int ptn3460_init(const char *hwi_block)
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{
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struct ptn_3460_config cfg;
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int status;
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uint8_t disp_con = 0, color_depth = 0;
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uint8_t edid_data[PTN_EDID_LEN];
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int i;
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if (!hwi_block || hwilib_find_blocks(hwi_block) != CB_SUCCESS) {
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printk(BIOS_ERR, "LCD: Info block \"%s\" not found!\n",
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hwi_block);
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return 1;
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}
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/* Get all needed information from hwinfo block. */
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if (hwilib_get_field(Edid, edid_data, sizeof(edid_data)) !=
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sizeof(edid_data)) {
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printk(BIOS_ERR, "LCD: No EDID data available in %s\n",
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hwi_block);
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return 1;
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}
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if ((hwilib_get_field(PF_DisplCon, &disp_con, sizeof(disp_con)) !=
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sizeof(disp_con))) {
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printk(BIOS_ERR, "LCD: Missing panel features from %s\n",
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hwi_block);
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return 1;
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}
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if (hwilib_get_field(PF_Color_Depth, &color_depth, sizeof(color_depth))
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!= sizeof(color_depth)) {
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printk(BIOS_ERR, "LCD: Missing panel features from %s\n",
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hwi_block);
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return 1;
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}
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/*
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* Here, all the desired information for setting up DP2LVDS converter
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* is present. Inside the converter, table 6 will be used for the
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* timings.
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*/
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status = ptn3460_write_edid(6, edid_data);
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if (status)
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return status;
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/* Select this table to be emulated. */
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ptn_select_edid(6);
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/* Read PTN configuration data. */
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status = i2c_read_bytes(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR,
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PTN_CONFIG_OFF, (uint8_t *)&cfg,
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sizeof(cfg));
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if (status)
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return (PTN_BUS_ERROR | status);
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/* Set up configuration data according to the hwinfo block we get. */
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cfg.dp_interface_ctrl = 0;
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cfg.lvds_interface_ctrl1 = 0x00;
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if (disp_con == PF_DISPLCON_LVDS_DUAL)
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/* Turn on dual LVDS lane and clock. */
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cfg.lvds_interface_ctrl1 |= 0x0b;
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if (color_depth == PF_COLOR_DEPTH_6BIT)
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/* Use 18 bits per pixel. */
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cfg.lvds_interface_ctrl1 |= 0x20;
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/* No clock spreading, 300 mV LVDS swing. */
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cfg.lvds_interface_ctrl2 = 0x03;
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/* No LVDS signal swap. */
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cfg.lvds_interface_ctrl3 = 0x00;
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/* Delay T2 (VDD to LVDS active) by 16 ms. */
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cfg.t2_delay = 1;
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/* 250 ms from LVDS to backlight active. */
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cfg.t3_timing = 10;
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/* 1 second re-power delay. */
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cfg.t12_timing = 20;
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/* 150 ms backlight off to LVDS inactive. */
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cfg.t4_timing = 3;
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/* Delay T5 (LVDS to VDD inactive) by 16 ms. */
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cfg.t5_delay = 1;
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/* Enable backlight control. */
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cfg.backlight_ctrl = 0;
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/* Write back configuration data to PTN3460. */
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for (i = 0; i < sizeof(struct ptn_3460_config); i++) {
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status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR,
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PTN_CONFIG_OFF+i,
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*(((uint8_t *)&cfg)+i));
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if (status)
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return (PTN_BUS_ERROR | status);
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}
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/* Read PTN configuration data. */
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status = i2c_read_bytes(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR,
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PTN_CONFIG_OFF, (uint8_t *)&cfg, sizeof(cfg));
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if (status)
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return (PTN_BUS_ERROR | status);
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return PTN_NO_ERROR;
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}
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/**
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* This function writes one Extended Display Identification Data (EDID)
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* structure to PTN3460.
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*
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* @param edid_num Number of EDID that must be written (0..6).
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* @param *data Pointer to a buffer where data to write is stored in.
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* @return 0 on success or error code.
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*/
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int ptn3460_write_edid(uint8_t edid_num, const uint8_t data[PTN_EDID_LEN])
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{
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int status;
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int i;
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if (edid_num > PTN_MAX_EDID_NUM)
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return PTN_INVALID_EDID;
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/* First enable access to the desired EDID table. */
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status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR,
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PTN_CONFIG_OFF + 5, edid_num);
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if (status)
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return (PTN_BUS_ERROR | status);
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/* Now we can simply write EDID-data to ptn3460. */
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for (i = 0; i < PTN_EDID_LEN; i++) {
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status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR,
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PTN_EDID_OFF + i, data[i]);
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if (status)
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return (PTN_BUS_ERROR | status);
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}
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return PTN_NO_ERROR;
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}
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/**
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* This function selects one of 7 EDID-tables inside PTN3460 which should be
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* emulated on DisplayPort and turn emulation ON.
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*
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* @param edid_num Number of EDID to emulate (0..6).
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* @return 0 on success or error code.
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*/
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int ptn_select_edid(uint8_t edid_num)
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{
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int status;
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uint8_t val;
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if (edid_num > PTN_MAX_EDID_NUM)
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return PTN_INVALID_EDID;
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/* Enable emulation of the desired EDID table. */
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val = (edid_num << 1) | 1;
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status = i2c_writeb(PTN_I2C_CONTROLLER, PTN_SLAVE_ADR,
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PTN_CONFIG_OFF + 4, val);
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if (status)
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return (PTN_BUS_ERROR | status);
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else
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return PTN_NO_ERROR;
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}
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@ -0,0 +1,91 @@
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2014-2017 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef PTN3460_H_
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#define PTN3460_H_
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#include <stdint.h>
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#define PTN_SLAVE_ADR 0x20
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#define PTN_I2C_CONTROLLER 0
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#define PTN_EDID_OFF 0x00
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#define PTN_EDID_LEN 0x80
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#define PTN_CONFIG_OFF 0x80
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#define PTN_FLASH_CFG_OFF 0xE8
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#define PTN_FLASH_CFG_LEN 0x04
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#define PTN_MAX_EDID_NUM 6
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/* Define some error codes that can be used. */
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#define PTN_NO_ERROR 0x00000000
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#define PTN_BUS_ERROR 0x10000000
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#define PTN_INVALID_EDID 0x20000000
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struct ptn_3460_config {
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/* DiplayPort interface control. */
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uint8_t dp_interface_ctrl;
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/* LVDS interface control register 1. */
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uint8_t lvds_interface_ctrl1;
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/* LVDS interface control register 2. */
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uint8_t lvds_interface_ctrl2;
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/* LVDS interface control register 3. */
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uint8_t lvds_interface_ctrl3;
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/* Select which EDID-block is emulated. */
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uint8_t edid_rom_emulation;
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/* Select which EDID block to map to 0..0x7F. */
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uint8_t edid_rom_access_ctrl;
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/* Smallest PWM frequency for back light. */
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uint8_t pwm_min[3];
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/* Biggest PWM frequency for back light. */
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uint8_t pwm_max[3];
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/* Fast link training control register. */
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uint8_t fast_link_ctrl;
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/* Pin configuration control register 1. */
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uint8_t pin_cfg_ctrl1;
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/* Pin configuration control register 2. */
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uint8_t pin_cfg_ctrl2;
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/* Default PWM bit count in DPCD register. */
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uint8_t pwm_default;
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/* Current PWM bit count in DPCD register. */
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uint16_t pwm_value;
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/* Default PWM frequency in DPCD register. */
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uint8_t pwm_default_freq;
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/* Panel T3 timing value. */
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uint8_t t3_timing;
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/* Panel T12 timing value. */
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uint8_t t12_timing;
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/* Back light control register. */
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uint8_t backlight_ctrl;
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/* Panel T2 delay. */
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uint8_t t2_delay;
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/* Panel T4 timing value. */
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uint8_t t4_timing;
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/* Panel T5 delay. */
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uint8_t t5_delay;
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} __attribute__((packed));
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struct ptn_3460_flash {
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/* Flash command (erase or erase and flash). */
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uint8_t cmd;
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/* Magic number needed by the flash algorithm. */
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uint16_t magic;
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/* Trigger for starting flash operation. */
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uint8_t trigger;
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} __attribute__((packed));
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int ptn3460_init(const char *hwi_block);
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int ptn3460_write_edid(uint8_t edid_num, const uint8_t data[PTN_EDID_LEN]);
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int ptn_select_edid(uint8_t edid_num);
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#endif /* PTN3460_H_ */
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