romstage.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <types.h>
#include <option.h>
#include <device/device.h>
 
#include <southbridge/intel/common/gpio.h>
#include <ec/lenovo/pmh7/pmh7.h>
#include <console/console.h>
 
#include "hybrid_graphics.h"
#include "chip.h"
 
/*
 * Returns the hybrid graphics presence and user's card preferences.
 */
void early_hybrid_graphics(bool *enable_igd, bool *enable_peg)
{
        const struct drivers_lenovo_hybrid_graphics_config *config;
        const struct device *dev;
        enum hybrid_graphics_req mode;
 
        /* TODO: Use generic device instead of dummy PNP device */
        dev = dev_find_slot_pnp(HYBRID_GRAPHICS_PORT, HYBRID_GRAPHICS_DEVICE);
 
        if (!dev || !dev->chip_info) {
                printk(BIOS_ERR, "Hybrid graphics: ERROR\n");
                *enable_igd = true;
                *enable_peg = false;
                return;
        }
 
        config = dev->chip_info;
        if (get_gpio(config->detect_gpio) == DGPU_NOT_INSTALLED) {
                printk(BIOS_DEBUG, "Hybrid graphics:"
                       " No discrete GPU present.\n");
                *enable_igd = true;
                *enable_peg = false;
                return;
        }
 
        mode = get_uint_option("hybrid_graphics_mode", HYBRID_GRAPHICS_DEFAULT_GPU);
 
        if (mode == HYBRID_GRAPHICS_DISCRETE) {
                printk(BIOS_DEBUG, "Hybrid graphics:"
                       " Disabling integrated GPU.\n");
 
                *enable_igd = false;
                *enable_peg = true;
        } else if (mode == HYBRID_GRAPHICS_INTEGRATED) {
                printk(BIOS_DEBUG, "Hybrid graphics:"
                       " Disabling discrete GPU.\n");
 
                *enable_igd = true;
                *enable_peg = false;
        } else {
                printk(BIOS_DEBUG, "Hybrid graphics:"
                       " Activating Switchable (both GPUs).\n");
 
                *enable_igd = true;
                *enable_peg = true;
        }
 
        /*
         * Need to do power handling here as we know there's a dGPU.
         * Support GPIO and Thinker1.
         */
        if (config->has_dgpu_power_gpio) {
                if (*enable_peg)
                        set_gpio(config->dgpu_power_gpio,
                                 !config->dgpu_power_off_lvl);
                else
                        set_gpio(config->dgpu_power_gpio,
                                 config->dgpu_power_off_lvl);
        } else if (config->has_thinker1) {
                bool power_en = pmh7_dgpu_power_state();
                if (*enable_peg != power_en)
                        pmh7_dgpu_power_enable(!power_en);
        } else {
                printk(BIOS_ERR, "Hybrid graphics:"
                       " FIXME: dGPU power handling not implemented\n");
        }
}