hybrid_graphics.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <option.h>
#include <device/device.h>
 
#include <southbridge/intel/common/gpio.h>
#include <console/console.h>
#include "chip.h"
 
/*
 * Switch panel mux or backlight mux to active GPU.
 * In case both GPUs are active switch panel mux to integrated.
 */
static void lenovo_hybrid_graphics_enable(struct device *dev)
{
        const struct drivers_lenovo_hybrid_graphics_config *config;
        enum hybrid_graphics_req mode;
 
        /* Don't confuse anyone else and disable the fake device */
        dev->enabled = 0;
 
        config = dev->chip_info;
        if (!config || (get_gpio(config->detect_gpio) == DGPU_NOT_INSTALLED)) {
                printk(BIOS_DEBUG, "Hybrid graphics: Not installed\n");
                return;
        }
 
        mode = get_uint_option("hybrid_graphics_mode", HYBRID_GRAPHICS_DEFAULT_GPU);
 
        if (mode == HYBRID_GRAPHICS_DISCRETE) {
                printk(BIOS_DEBUG, "Hybrid graphics:"
                       " Switching panel to discrete GPU.\n");
 
                if (config->has_panel_hybrid_gpio)
                        set_gpio(config->panel_hybrid_gpio,
                                 !config->panel_integrated_lvl);
 
                if (config->has_backlight_gpio)
                        set_gpio(config->backlight_gpio,
                                 !config->backlight_integrated_lvl);
        } else {
                printk(BIOS_DEBUG, "Hybrid graphics:"
                       " Switching panel to integrated GPU.\n");
 
                if (config->has_panel_hybrid_gpio)
                        set_gpio(config->panel_hybrid_gpio,
                                 config->panel_integrated_lvl);
 
                if (config->has_backlight_gpio)
                        set_gpio(config->backlight_gpio,
                                 config->backlight_integrated_lvl);
        }
}
 
struct chip_operations drivers_lenovo_hybrid_graphics_ops = {
        CHIP_NAME("Lenovo hybrid graphics driver")
        .enable_dev = lenovo_hybrid_graphics_enable
};