| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #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}, |
| {"LTD133EQ1B", 264}, /* Found on an X301 */ |
| {"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"; |
| } |
| } |