vbt.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi.h>
#include <bootmode.h>
#include <console/console.h>
#include <drivers/intel/gma/opregion.h>
#include <fsp/ramstage.h>
#include <fsp/util.h>
#include <lib.h>
 
/* Locate VBT and pass it to FSP GOP */
void load_vbt(SILICON_INIT_UPD *params)
{
        const optionrom_vbt_t *vbt_data = NULL;
        size_t vbt_len;
 
        /* Check boot mode - for S3 resume path VBT loading is not needed */
        if (acpi_is_wakeup_s3()) {
                printk(BIOS_DEBUG, "S3 resume do not pass VBT to GOP\n");
        } else if (display_init_required()) {
                /* Get VBT data */
                vbt_data = locate_vbt(&vbt_len);
                if (vbt_data != NULL) {
                        if (CONFIG(DISPLAY_VBT)) {
                                /* Display the vbt file contents */
                                printk(BIOS_DEBUG, "VBT Data:\n");
                                hexdump(vbt_data, vbt_len);
                                printk(BIOS_DEBUG, "\n");
                        }
                        printk(BIOS_DEBUG, "Passing VBT to GOP\n");
                } else {
                        printk(BIOS_DEBUG, "VBT not found!\n");
                }
        } else {
                printk(BIOS_DEBUG, "Not passing VBT to GOP\n");
        }
        params->GraphicsConfigPtr = (u32)vbt_data;
}