mb/google/rauru: Add panel driver in mainboard

Add panel driver in mainboard for rauru project and support OLED eDP
panel.

TEST=check edp training pass and show log:
EQ training pass
BUG=b:343351631

Signed-off-by: Bincai Liu <bincai.liu@mediatek.corp-partner.google.com>
Change-Id: Iea610c97351beb94a49cc1044701a523b7c85a6e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85951
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/mainboard/google/rauru/Kconfig

@@ -33,6 +33,8 @@ config BOARD_SPECIFIC_OPTIONS
 	select TPM_GOOGLE_TI50 if VBOOT
 	select COMMONLIB_STORAGE
 	select COMMONLIB_STORAGE_MMC
+	select FW_CONFIG
+	select FW_CONFIG_SOURCE_CHROMEEC_CBI
 
 config MAINBOARD_DIR
 	string

src/mainboard/google/rauru/Makefile.mk

@@ -10,4 +10,5 @@ romstage-y += romstage.c
 
 ramstage-y += boardid.c
 ramstage-y += mainboard.c
+ramstage-y += panel.c
 ramstage-y += regulator.c

src/mainboard/google/rauru/chromeos.c

@@ -56,6 +56,12 @@ void fill_lb_gpios(struct lb_gpios *gpios)
 		lb_add_gpios(gpios, alc5645_gpios, ARRAY_SIZE(alc5645_gpios));
 	else
 		lb_add_gpios(gpios, nau8318_gpios, ARRAY_SIZE(nau8318_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)

src/mainboard/google/rauru/devicetree.cb

@@ -8,6 +8,13 @@ fw_config
 	end
 end
 
+fw_config
+	field PANEL 18 21
+		option DEFAULT 0
+		option OLED 1
+	end
+end
+
 chip soc/mediatek/mt8196
 	device cpu_cluster 0 on end
 

src/mainboard/google/rauru/gpio.h

@@ -15,6 +15,11 @@
 #define GPIO_FP_RST_1V8_S3_L	GPIO(EINT26)
 #define GPIO_AP_FP_FW_UP_STRAP	GPIO(EINT27)
 #define GPIO_EN_PWR_FP		GPIO(PERIPHERAL_EN3)
+#define GPIO_BL_PWM_1V8		GPIO(DISP_PWM)
+
+#define GPIO_AP_EDP_BKLTEN	GPIO(PERIPHERAL_EN4)
+#define GPIO_EN_PP3300_EDP_X	GPIO(PERIPHERAL_EN2)
+#define GPIO_EDP_HPD_1V8	GPIO(EINT13)
 
 #define GPIO_I2SI4_BCK		GPIO(I2SIN1_BCK)
 #define GPIO_I2SI4_LRCK		GPIO(I2SIN1_LRCK)

src/mainboard/google/rauru/panel.c

@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
+
+#include <fw_config.h>
+#include <gpio.h>
+#include <soc/ddp.h>
+#include <soc/dsi.h>
+
+#include "gpio.h"
+#include "panel.h"
+
+/* Set up backlight control pins as output pin and 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_set_mode(GPIO_EDP_HPD_1V8, GPIO_FUNC(EINT13, EDP_TX_HPD));
+}
+
+static struct panel_description panel = {
+	.configure_backlight = configure_backlight,
+	.power_on = power_on_panel,
+	.disp_path = DISP_PATH_EDP,
+	.orientation = LB_FB_ORIENTATION_NORMAL,
+};
+
+static void power_on_oled_panel(void)
+{
+	gpio_output(GPIO_EN_PP3300_EDP_X, 1);
+	gpio_set_mode(GPIO_EDP_HPD_1V8, GPIO_FUNC(EINT13, EDP_TX_HPD));
+}
+
+static struct panel_description oled_panel = {
+	.configure_backlight = configure_backlight,
+	.power_on = power_on_oled_panel,
+	.disp_path = DISP_PATH_EDP,
+	.orientation = LB_FB_ORIENTATION_NORMAL,
+};
+
+struct panel_description *get_active_panel(void)
+{
+	if (fw_config_probe(FW_CONFIG(PANEL, OLED))) {
+		return &oled_panel;
+	}
+	return &panel;
+}

src/mainboard/google/rauru/panel.h

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __MAINBOARD_GOOGLE_RAURU_PANEL_H__
+#define __MAINBOARD_GOOGLE_RAURU_PANEL_H__
+
+struct panel_description *get_oled_description(void);
+
+#endif /* __MAINBOARD_GOOGLE_RAURU_PANEL_H__ */