mb/google/kukui: Support panels using ANX7625

For Kukui followers using ANX7625 eDP bridge to access panel.

BUG=b:140132295
TEST=make # board = kukui

Change-Id: I7dc9c68d076fd0ba4e963cde9414d25c17b332cb
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36767
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/google/kukui/Kconfig

@@ -42,6 +42,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select MAINBOARD_FORCE_NATIVE_VGA_INIT
 	select HAVE_LINEAR_FRAMEBUFFER
 	select DRIVER_PARADE_PS8640 if BOARD_GOOGLE_JACUZZI
+	select DRIVER_ANALOGIX_ANX7625 if BOARD_GOOGLE_JUNIPER || BOARD_GOOGLE_DAMU || BOARD_GOOGLE_KAPPA
 	select MT8183_DRAM_EMCP if BOARD_GOOGLE_KRANE
 
 config MAINBOARD_DIR

src/mainboard/google/kukui/Makefile.inc

@@ -30,4 +30,6 @@ ramstage-$(CONFIG_BOARD_GOOGLE_KODAMA) += panel_kodama.c
 ramstage-$(CONFIG_BOARD_GOOGLE_KRANE) += panel_krane.c
 ramstage-$(CONFIG_BOARD_GOOGLE_KUKUI) += panel_kukui.c
 ramstage-$(CONFIG_DRIVER_PARADE_PS8640) += panel_ps8640.c
+ramstage-$(CONFIG_DRIVER_ANALOGIX_ANX7625) += panel_anx7625.c
+
 ramstage-y += reset.c

src/mainboard/google/kukui/panel_anx7625.c

@@ -0,0 +1,79 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <delay.h>
+#include <drivers/analogix/anx7625/anx7625.h>
+#include <edid.h>
+#include <gpio.h>
+#include <soc/i2c.h>
+#include <string.h>
+
+#include "panel.h"
+
+
+static void power_on_anx7625(void)
+{
+	gpio_output(GPIO_MIPIBRDG_RST_L_1V8, 0);
+	gpio_output(GPIO_PP1200_MIPIBRDG_EN, 1);
+	gpio_output(GPIO_VDDIO_MIPIBRDG_EN, 1);
+	gpio_output(GPIO_PP1800_LCM_EN, 1);
+	mdelay(2);
+	gpio_output(GPIO_MIPIBRDG_PWRDN_L_1V8, 1);
+	mdelay(10);
+	gpio_output(GPIO_MIPIBRDG_RST_L_1V8, 1);
+	gpio_output(GPIO_PP3300_LCM_EN, 1);
+}
+
+static void dummy_power_on(void)
+{
+	/* The panel has been already powered on when getting panel information
+	 * so we should do nothing here.
+	 */
+}
+
+static struct panel_serializable_data anx7625_data = {
+	.orientation = LB_FB_ORIENTATION_NORMAL,
+	.init = { INIT_END_CMD },
+};
+
+static struct panel_description anx7625_panel = {
+	.s = &anx7625_data,
+	.power_on = dummy_power_on,
+};
+
+struct panel_description *get_panel_description(int panel_id)
+{
+	/* To read panel EDID, we have to first power on anx7625. */
+	power_on_anx7625();
+
+	u8 i2c_bus = 4;
+	mtk_i2c_bus_init(i2c_bus);
+
+	if (anx7625_init(i2c_bus)) {
+		printk(BIOS_ERR, "Can't init ANX7625 bridge.\n");
+		return NULL;
+	}
+	struct edid *edid = &anx7625_data.edid;
+	if (anx7625_dp_get_edid(i2c_bus, edid)) {
+		printk(BIOS_ERR, "Can't get panel's edid.\n");
+		return NULL;
+	}
+	if (anx7625_dp_start(i2c_bus, edid) < 0) {
+		printk(BIOS_ERR, "Can't start display via ANX7625.\n");
+		return NULL;
+	}
+	return &anx7625_panel;
+}