mb/google/skywalker: Add MIPI panel support with TM_TL121BVMS07_00C

Add support for MIPI panel on padme and enable TM_TL121BVMS07_00C as
the default panel. The panel uses AW37503 as the bias IC, with supply
set to ±5.9V. Add AW37503 initialization and power-on sequence are
configured according to the specification.

The developer/recovery screen is not functional yet as the vendor is
still debugging it. This change is proposed to enable firmware build.

BUG=b:432353024
TEST=emerge-skywalker coreboot

Change-Id: I37a1c0352a8619ce5b10727cdeef524ccb1107ef
Signed-off-by: Yang Wu <wuyang5@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89218
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>

src/mainboard/google/skywalker/Kconfig

@@ -41,6 +41,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select RTC
 	select COMMONLIB_STORAGE
 	select COMMONLIB_STORAGE_MMC
+	select MIPI_PANEL_TM_TL121BVMS07_00C if BOARD_GOOGLE_PADME
 
 config MAINBOARD_DIR
 	string

src/mainboard/google/skywalker/Makefile.mk

@@ -13,3 +13,5 @@ ramstage-y += boardid.c
 ramstage-y += mainboard.c
 ramstage-y += panel.c
 ramstage-y += regulator.c
+
+ramstage-$(CONFIG_BOARD_GOOGLE_PADME) += panel_padme.c

src/mainboard/google/skywalker/mainboard.c

@@ -17,6 +17,7 @@
 #include <soc/usb.h>
 
 #include "gpio.h"
+#include "panel.h"
 #include "storage.h"
 
 #define AFE_SE_SECURE_CON1	(AUDIO_BASE + 0x5634)
@@ -88,6 +89,8 @@ enum mtk_storage_type mainboard_get_storage_type(void)
 
 static void mainboard_init(struct device *dev)
 {
+	mt6359p_init_pmif_arb();
+
 	if (mainboard_get_storage_type() == STORAGE_EMMC) {
 		mtk_msdc_configure_emmc(true);
 		mtcmos_ufs_power_off();

src/mainboard/google/skywalker/panel.c

@@ -1,12 +1,34 @@
 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
 
+#include <console/console.h>
+#include <delay.h>
+#include <device/i2c_simple.h>
+
 #include <gpio.h>
 #include <soc/display.h>
+#include <soc/regulator.h>
 
 #include "gpio.h"
+#include "panel.h"
+
+static void aw37503_init(unsigned int bus)
+{
+	i2c_write_field(bus, PMIC_AW37503_SLAVE, 0x00, 0x13, 0x1F, 0);
+	i2c_write_field(bus, PMIC_AW37503_SLAVE, 0x01, 0x13, 0x1F, 0);
+	i2c_write_field(bus, PMIC_AW37503_SLAVE, 0x21, 0x4C, 0xFF, 0);
+	i2c_write_field(bus, PMIC_AW37503_SLAVE, 0x03, 0x43, 0xFF, 0);
+	i2c_write_field(bus, PMIC_AW37503_SLAVE, 0x21, 0x00, 0xFF, 0);
+}
+
+static bool is_pmic_aw37503(unsigned int bus)
+{
+	u8 vendor_id;
+	return (!i2c_read_field(bus, PMIC_AW37503_SLAVE,
+				0x04, &vendor_id, 0x0F, 0) && vendor_id == 0x01);
+}
 
 /* Set up backlight control pins as output pins, and set them to power off by default */
-static void configure_backlight(void)
+void panel_configure_backlight(void)
 {
 	gpio_output(GPIO_EDP_BL_EN_1V8, 0);
 	gpio_output(GPIO_BL_PWM_1V8, 0);
@@ -19,8 +41,39 @@ static void power_on_panel(void)
 	gpio_set_pull(GPIO_EDP_HPD_1V8, GPIO_PULL_DISABLE, GPIO_PULL_UP);
 }
 
+void mipi_panel_power_on(void)
+{
+	struct aw37503_config config = {
+		.i2c_bus = PMIC_I2C_BUS,
+		.en = GPIO_TCHSCR_REPORT_DISABLE,
+	};
+	gpio_output(config.en, 0);
+	mdelay(1);
+
+	mainboard_set_regulator_voltage(MTK_REGULATOR_VCN18, 1800000);
+	mtk_i2c_bus_init(config.i2c_bus, I2C_SPEED_FAST);
+
+	mainboard_enable_regulator(MTK_REGULATOR_VCN18, true);
+	mdelay(5);
+
+	if (is_pmic_aw37503(config.i2c_bus)) {
+		printk(BIOS_DEBUG, "Initialize and power on PMIC AW37503\n");
+		aw37503_init(config.i2c_bus);
+		gpio_output(config.en, 1);
+		mdelay(10);
+	}
+	gpio_output(GPIO_EN_PP3300_EDP_X, 0);
+	mdelay(1);
+	gpio_output(GPIO_EN_PP3300_EDP_X, 1);
+	mdelay(1);
+	gpio_output(GPIO_TCHSCR_RST_1V8_L, 0);
+	mdelay(1);
+	gpio_output(GPIO_TCHSCR_RST_1V8_L, 1);
+	mdelay(6);
+}
+
 static struct panel_description panel = {
-	.configure_backlight = configure_backlight,
+	.configure_backlight = panel_configure_backlight,
 	.power_on = power_on_panel,
 	.disp_path = DISP_PATH_EDP,
 	.orientation = LB_FB_ORIENTATION_NORMAL,
@@ -28,5 +81,8 @@ static struct panel_description panel = {
 
 struct panel_description *get_active_panel(void)
 {
+	if (CONFIG(BOARD_GOOGLE_PADME))
+		return get_panel_description();
+
 	return &panel;
 }

src/mainboard/google/skywalker/panel.h

@@ -3,6 +3,24 @@
 #ifndef __MAINBOARD_GOOGLE_SKYWALKER_PANEL_H__
 #define __MAINBOARD_GOOGLE_SKYWALKER_PANEL_H__
 
+#include <gpio.h>
+#include <soc/display.h>
+#include <soc/i2c.h>
+
+#define PMIC_AW37503_SLAVE	0x3E
+#define PMIC_I2C_BUS		I2C6
+
+struct aw37503_config {
+	uint32_t i2c_bus;
+	gpio_t en;
+};
+
 uint8_t panel_id(void);
 
+void panel_configure_backlight(void);
+void mipi_panel_power_on(void);
+
+/* Return the mipi panel description */
+struct panel_description *get_panel_description(void);
+
 #endif

src/mainboard/google/skywalker/panel_padme.c

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+
+#include "gpio.h"
+#include "panel.h"
+
+static struct panel_description padme_panels[] = {
+	[0x22] = {
+		.configure_backlight = panel_configure_backlight,
+		.power_on = mipi_panel_power_on,
+		.name = "TM_TL121BVMS07_00C",
+		.disp_path = DISP_PATH_MIPI,
+		.orientation = LB_FB_ORIENTATION_LEFT_UP,
+	},
+};
+
+struct panel_description *get_panel_description(void)
+{
+	uint8_t id = panel_id();
+	if (id >= ARRAY_SIZE(padme_panels))
+		return NULL;
+
+	return &padme_panels[id];
+}