blob: 6c5779a0b24fb7779e4bd1c644e8e5308f98f5db [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 arthur@aheymans.xyz
*
* 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 <stdint.h>
#include <commonlib/helpers.h>
#include <console/console.h>
#include <northbridge/intel/gm45/gm45.h>
#include <drivers/intel/gma/opregion.h>
static const struct blc_pwm_t blc_entries[] = {
/* corrected to 320MHz CDClk, vendor set 753; works fine at both: */
{"LTD121EQ3B", 447},
{"LTD121EWVB", 165},
{"B121EW03 V6 ", 165},
/* datasheets: between 100 and 20k, typical 200 */
/* TESTED: works best at 400 */
{"B121EW09 V3 ", 400},
{"HV121WX4-120", 110}, /* Aftermarket AFFS lcd, works well at low pwm */
{"LTN121AT03001", 110},
{"LTN121AP03001", 750},
/* TODO: untested panels found on thinkwiki */
/* Generally CCFL runs best at lower PWM */
/* {"B121EW09 V2 ", 450}, */
/* {"N121IB-L05", 450}, */
{"LP121WX3-TLC1", 400}, /* TESTED to work best at this value */
/* {"LP121WX3-TLA1" 450}, */
/* {"B121EW03 V3 " 110}, */
/* {"LTN121AP02001" 110}, */
};
int get_blc_values(const struct blc_pwm_t **entries)
{
*entries = blc_entries;
return ARRAY_SIZE(blc_entries);
}
const char *mainboard_vbt_filename(void)
{
u16 pwm_freq;
pwm_freq = get_blc_pwm_freq_value(NULL);
if (pwm_freq == 0) {
printk(BIOS_DEBUG,
"GMA: Display backlight type not found, assuming LED\n");
return "data_led.vbt";
} else if (pwm_freq > 200) {
printk(BIOS_DEBUG, "GMA: Using LED backlight VBT\n");
return "data_led.vbt";
} else {
printk(BIOS_DEBUG, "GMA: Using CCFL backlight VBT\n");
return "data_ccfl.vbt";
}
}