src/mainboard/google/corsola/panel_ps8640.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <delay.h>
   5 #include <drivers/parade/ps8640/ps8640.h>
   6 #include <edid.h>
   7 #include <gpio.h>
   8 #include <soc/i2c.h>
   9 #include <soc/regulator.h>
  10
  11 #include "gpio.h"
  12 #include "panel.h"
  13
  14 static void bridge_ps8640_power_on(void)
  15 {
  16         /*
  17          * PS8640 power-on sequence is described in chapter 14, PS8640_DS_V1.4_20200210.docx
  18          * - set VDD12 to be 1.2V
  19          * - delay 100us
  20          * - set VDD33 to be 3.3V
  21          * - pull hign PD#
  22          * - pull down RST#
  23          * - delay 2ms
  24          * - pull high RST#
  25          * - delay more than 50ms (55ms for margin)
  26          * - pull down RST#
  27          * - delay more than 50ms (55ms for margin)
  28          * - pull high RST#
  29          */
  30
  31         /* Set VRF12 to 1.2V and VCN33 to 3.3V */
  32         mainboard_set_regulator_voltage(MTK_REGULATOR_VRF12, 1200000);
  33         udelay(100);
  34         mainboard_set_regulator_voltage(MTK_REGULATOR_VCN33, 3300000);
  35         udelay(200);
  36
  37         /* Turn on bridge */
  38         gpio_output(GPIO_EDPBRDG_PWREN, 1);
  39         gpio_output(GPIO_EDPBRDG_RST_L, 0);
  40         mdelay(2);
  41         gpio_output(GPIO_EDPBRDG_RST_L, 1);
  42         mdelay(55);
  43         gpio_output(GPIO_EDPBRDG_RST_L, 0);
  44         mdelay(55);
  45         gpio_output(GPIO_EDPBRDG_RST_L, 1);
  46 }
  47
  48 static void panel_power_on(void)
  49 {
  50         /* Turn on the panel */
  51         gpio_output(GPIO_EN_PP3300_DISP_X, 1);
  52         bridge_ps8640_power_on();
  53 }
  54
  55 static int bridge_ps8640_get_edid(struct edid *edid)
  56 {
  57         const u8 chip = 0x8;
  58
  59         if (ps8640_init(BRIDGE_I2C, chip) < 0) {
  60                 printk(BIOS_ERR, "%s: Can't init PS8640 bridge\n", __func__);
  61                 return -1;
  62         }
  63         if (ps8640_get_edid(BRIDGE_I2C, chip, edid) < 0) {
  64                 printk(BIOS_ERR, "%s: Can't get panel's edid\n", __func__);
  65                 return -1;
  66         }
  67         return 0;
  68 }
  69
  70 static struct panel_description ps8640_bridge = {
  71         .configure_backlight = backlight_control,
  72         .power_on = panel_power_on,
  73         .get_edid = bridge_ps8640_get_edid,
  74         .disp_path = DISP_PATH_MIPI,
  75         .orientation = LB_FB_ORIENTATION_NORMAL,
  76 };
  77
  78 struct panel_description *get_ps8640_description(void)
  79 {
  80         mtk_i2c_bus_init(BRIDGE_I2C, I2C_SPEED_FAST);
  81         return &ps8640_bridge;
  82 }