From 4ef51ffbd7e0437de15011929257b6286da7f8f9 Mon Sep 17 00:00:00 2001
From: Vince Liu <vince-wl.liu@mediatek.corp-partner.google.com>
Date: Mon, 16 Jun 2025 22:43:58 +0800
Subject: [PATCH] mb/google/skywalker: Add panel driver in mainboard

Add panel driver in mainboard for skywalker project.

BUG=b:400886838,b:425272330
BRANCH=none
TEST=check edp training pass and show log:
EQ training pass

Change-Id: I7352a6728237842a6819b7129c61a1d4c7646fcb
Signed-off-by: Bincai Liu <bincai.liu@mediatek.corp-partner.google.com>
Signed-off-by: Cong Yang <yangcong5@huaqin.corp-partner.google.com>
Signed-off-by: Vince Liu <vince-wl.liu@mediatek.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88170
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
---
 src/mainboard/google/skywalker/Makefile.mk |  1 +
 src/mainboard/google/skywalker/chromeos.c  |  6 ++++
 src/mainboard/google/skywalker/gpio.h      |  4 +++
 src/mainboard/google/skywalker/panel.c     | 32 ++++++++++++++++++++++
 4 files changed, 43 insertions(+)
 create mode 100644 src/mainboard/google/skywalker/panel.c

diff --git a/src/mainboard/google/skywalker/Makefile.mk b/src/mainboard/google/skywalker/Makefile.mk
index 3e5bad3f37..ff3c1701de 100644
--- a/src/mainboard/google/skywalker/Makefile.mk
+++ b/src/mainboard/google/skywalker/Makefile.mk
@@ -11,4 +11,5 @@ romstage-y += regulator.c
 
 ramstage-y += boardid.c
 ramstage-y += mainboard.c
+ramstage-y += panel.c
 ramstage-y += regulator.c
diff --git a/src/mainboard/google/skywalker/chromeos.c b/src/mainboard/google/skywalker/chromeos.c
index 700d815c68..2bf47ed797 100644
--- a/src/mainboard/google/skywalker/chromeos.c
+++ b/src/mainboard/google/skywalker/chromeos.c
@@ -67,6 +67,12 @@ void fill_lb_gpios(struct lb_gpios *gpios)
 		};
 		lb_add_gpios(gpios, alc5645_gpios, ARRAY_SIZE(alc5645_gpios));
 	}
+
+	struct lb_gpio edp_pwm_backlight_gpios[] = {
+		{GPIO_BL_PWM_1V8.id, ACTIVE_HIGH, -1, "PWM control"},
+		{GPIO_AP_EDP_BKLTEN.id, ACTIVE_HIGH, -1, "backlight enable"},
+	};
+	lb_add_gpios(gpios, edp_pwm_backlight_gpios, ARRAY_SIZE(edp_pwm_backlight_gpios));
 }
 
 int cr50_plat_irq_status(void)
diff --git a/src/mainboard/google/skywalker/gpio.h b/src/mainboard/google/skywalker/gpio.h
index 4398a6cbf3..a55a01aab1 100644
--- a/src/mainboard/google/skywalker/gpio.h
+++ b/src/mainboard/google/skywalker/gpio.h
@@ -35,6 +35,10 @@
 #define GPIO_I2SOUT0_BCK		GPIO(I2SOUT0_BCK)
 #define GPIO_I2SOUT0_LRCK		GPIO(I2SOUT0_LRCK)
 #define GPIO_I2SOUT0_DOUT		GPIO(I2SOUT0_DO)
+#define GPIO_BL_PWM_1V8			GPIO(DISP_PWM0)
+#define GPIO_AP_EDP_BKLTEN		GPIO(GPIO13)
+#define GPIO_EN_PP3300_EDP_X		GPIO(DSI_LCM_RST)
+#define GPIO_EDP_HPD_1V8		GPIO(EDP_TX_HPD)
 
 void setup_chromeos_gpios(void);
 
diff --git a/src/mainboard/google/skywalker/panel.c b/src/mainboard/google/skywalker/panel.c
new file mode 100644
index 0000000000..b0cb052881
--- /dev/null
+++ b/src/mainboard/google/skywalker/panel.c
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#include <gpio.h>
+#include <soc/display.h>
+
+#include "gpio.h"
+
+/* Set up backlight control pins as output pins, and set them to power off by default */
+static void configure_backlight(void)
+{
+	gpio_output(GPIO_AP_EDP_BKLTEN, 0);
+	gpio_output(GPIO_BL_PWM_1V8, 0);
+}
+
+static void power_on_panel(void)
+{
+	gpio_output(GPIO_EN_PP3300_EDP_X, 1);
+	gpio_set_mode(GPIO_EDP_HPD_1V8, GPIO_FUNC(EDP_TX_HPD, EDP_TX_HPD));
+	gpio_set_pull(GPIO_EDP_HPD_1V8, GPIO_PULL_DISABLE, GPIO_PULL_UP);
+}
+
+static struct panel_description panel = {
+	.configure_backlight = configure_backlight,
+	.power_on = power_on_panel,
+	.disp_path = DISP_PATH_EDP,
+	.orientation = LB_FB_ORIENTATION_NORMAL,
+};
+
+struct panel_description *get_active_panel(void)
+{
+	return &panel;
+}