src/drivers/lenovo/hybrid_graphics/hybrid_graphics.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <option.h>
   4 #include <device/device.h>
   5
   6 #include <southbridge/intel/common/gpio.h>
   7 #include <console/console.h>
   8 #include "chip.h"
   9
  10 /*
  11  * Switch panel mux or backlight mux to active GPU.
  12  * In case both GPUs are active switch panel mux to integrated.
  13  */
  14 static void lenovo_hybrid_graphics_enable(struct device *dev)
  15 {
  16         const struct drivers_lenovo_hybrid_graphics_config *config;
  17         enum hybrid_graphics_req mode;
  18
  19         /* Don't confuse anyone else and disable the fake device */
  20         dev->enabled = 0;
  21
  22         config = dev->chip_info;
  23         if (!config || (get_gpio(config->detect_gpio) == DGPU_NOT_INSTALLED)) {
  24                 printk(BIOS_DEBUG, "Hybrid graphics: Not installed\n");
  25                 return;
  26         }
  27
  28         mode = get_uint_option("hybrid_graphics_mode", HYBRID_GRAPHICS_DEFAULT_GPU);
  29
  30         if (mode == HYBRID_GRAPHICS_DISCRETE) {
  31                 printk(BIOS_DEBUG, "Hybrid graphics:"
  32                        " Switching panel to discrete GPU.\n");
  33
  34                 if (config->has_panel_hybrid_gpio)
  35                         set_gpio(config->panel_hybrid_gpio,
  36                                  !config->panel_integrated_lvl);
  37
  38                 if (config->has_backlight_gpio)
  39                         set_gpio(config->backlight_gpio,
  40                                  !config->backlight_integrated_lvl);
  41         } else {
  42                 printk(BIOS_DEBUG, "Hybrid graphics:"
  43                        " Switching panel to integrated GPU.\n");
  44
  45                 if (config->has_panel_hybrid_gpio)
  46                         set_gpio(config->panel_hybrid_gpio,
  47                                  config->panel_integrated_lvl);
  48
  49                 if (config->has_backlight_gpio)
  50                         set_gpio(config->backlight_gpio,
  51                                  config->backlight_integrated_lvl);
  52         }
  53 }
  54
  55 struct chip_operations drivers_lenovo_hybrid_graphics_ops = {
  56         .name = "Lenovo hybrid graphics driver",
  57         .enable_dev = lenovo_hybrid_graphics_enable
  58 };