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/*
* This file is part of the coreboot project.
*
* Copyright 2015 MediaTek Inc.
*
* 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 <delay.h>
#include <device/i2c.h>
#include <edid.h>
#include <console/console.h>
#include <timer.h>
#include "ps8640.h"
int ps8640_get_edid(uint8_t bus, uint8_t chip, struct edid *out)
{
int ret;
u8 edid[EDID_LENGTH * 2];
int edid_size = EDID_LENGTH;
i2c_writeb(bus, chip + 2, PAGE2_I2C_BYPASS,
EDID_I2C_ADDR | I2C_BYPASS_EN);
ret = i2c_read_bytes(bus, EDID_I2C_ADDR, 0, edid, EDID_LENGTH);
if (ret != 0) {
printk(BIOS_INFO, "Failed to read EDID.\n");
return -1;
}
/* check if edid have extension flag, and read additional EDID data */
if (edid[EDID_EXTENSION_FLAG]) {
edid_size += EDID_LENGTH;
ret = i2c_read_bytes(bus, EDID_I2C_ADDR, EDID_LENGTH,
&edid[EDID_LENGTH], EDID_LENGTH);
if (ret != 0) {
printk(BIOS_INFO, "Failed to read EDID ext block.\n");
return -1;
}
}
if (decode_edid(edid, edid_size, out) != EDID_CONFORMANT) {
printk(BIOS_INFO, "Failed to decode EDID.\n");
return -1;
}
return 0;
}
int ps8640_init(uint8_t bus, uint8_t chip)
{
u8 set_vdo_done;
struct stopwatch sw;
mdelay(200);
stopwatch_init_msecs_expire(&sw, 200);
while (true) {
i2c_readb(bus, chip + 2, PAGE2_GPIO_H, &set_vdo_done);
if ((set_vdo_done & PS_GPIO9) == PS_GPIO9)
break;
if (stopwatch_expired(&sw)) {
printk(BIOS_INFO, "Failed to init ps8640.\n");
return -1;
}
mdelay(20);
}
mdelay(50);
/*
* The Manufacturer Command Set (MCS) is a device dependent interface
* intended for factory programming of the display module default
* parameters. Once the display module is configured, the MCS shall be
* disabled by the manufacturer. Once disabled, all MCS commands are
* ignored by the display interface.
*/
i2c_write_field(bus, chip + 2, PAGE2_MCS_EN, 0x0, MCS_EN_MASK,
MCS_EN_SHIFT);
i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_DIS);
i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_EN);
return 0;
}
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