From d30f08e295a9dcd696279f2e96ba4a961a141152 Mon Sep 17 00:00:00 2001
From: Nancy Lin <nancy.lin@mediatek.corp-partner.google.com>
Date: Tue, 10 Dec 2024 15:41:55 +0800
Subject: [PATCH] mb/google/rauru: Configure firmware display for eDP panel

Add eDP panel power-on sequences and initialize the display in the
ramstage. The mt6373_set_vcn33_3_voltage function sets the voltage
required to power on the eDP panel.

TEST=Build pass, the firmware screen displays correctly.
BUG=b:343351631, b:353464237

Signed-off-by: Nancy Lin <nancy.lin@mediatek.corp-partner.google.com>
Change-Id: Ic928b2478c41ccd03223fd2b73d9e81d303a2036
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85952
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
---
 src/mainboard/google/rauru/Kconfig     |  2 ++
 src/mainboard/google/rauru/mainboard.c | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/src/mainboard/google/rauru/Kconfig b/src/mainboard/google/rauru/Kconfig
index a6868380df..ae3ffb3bf3 100644
--- a/src/mainboard/google/rauru/Kconfig
+++ b/src/mainboard/google/rauru/Kconfig
@@ -23,6 +23,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select COMMON_CBFS_SPI_WRAPPER
 	select SPI_FLASH
 	select SPI_FLASH_INCLUDE_ALL_DRIVERS
+	select MAINBOARD_HAS_NATIVE_VGA_INIT
+	select HAVE_LINEAR_FRAMEBUFFER
 	select CHROMEOS_USE_EC_WATCHDOG_FLAG if CHROMEOS
 	select EC_GOOGLE_CHROMEEC
 	select EC_GOOGLE_CHROMEEC_BOARDID
diff --git a/src/mainboard/google/rauru/mainboard.c b/src/mainboard/google/rauru/mainboard.c
index 817bcf28ac..f55da81329 100644
--- a/src/mainboard/google/rauru/mainboard.c
+++ b/src/mainboard/google/rauru/mainboard.c
@@ -1,15 +1,18 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <bootmode.h>
 #include <console/console.h>
 #include <device/device.h>
 #include <fw_config.h>
 #include <gpio.h>
 #include <soc/addressmap.h>
 #include <soc/bl31.h>
+#include <soc/display.h>
 #include <soc/dpm_v2.h>
 #include <soc/gpio_common.h>
 #include <soc/i2c.h>
 #include <soc/msdc.h>
+#include <soc/mt6373.h>
 #include <soc/pcie.h>
 #include <soc/spm_common.h>
 #include <soc/storage.h>
@@ -70,6 +73,13 @@ static void power_on_fpmcu(void)
 	gpio_output(GPIO_FP_RST_1V8_S3_L, 1);
 }
 
+static void enable_display_power_rail(void)
+{
+	mt6373_init_pmif_arb();
+	mt6373_enable_vcn33_3(true);
+	mt6373_set_vcn33_3_voltage(3300000);
+}
+
 enum mtk_storage_type mainboard_get_storage_type(void)
 {
 	uint32_t index = storage_id();
@@ -96,6 +106,14 @@ bool mainboard_needs_pcie_init(void)
 
 static void mainboard_init(struct device *dev)
 {
+	if (display_init_required()) {
+		enable_display_power_rail();
+		if (mtk_display_init() < 0)
+			printk(BIOS_ERR, "%s: Failed to init display\n", __func__);
+	} else {
+		printk(BIOS_INFO, "%s: Skipped display initialization\n", __func__);
+	}
+
 	setup_usb_host();
 	power_on_fpmcu();
 	configure_audio();