mchpevb1: Add remaining board files

Add Microchip EVB plus SKL RVP3 remaining board
files for battery, LED, and USB PD.

BRANCH=none
BUG=
TEST=Review only.
CQ-DEPEND=CL:840654,CL:841022

Change-Id: I34ccb33eb44e73ab841f96f4733bfe419b095678
Signed-off-by: Scott Worley <scott.worley@microchip.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/841043
Commit-Ready: Randall Spangler <rspangler@chromium.org>
Tested-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

3 files changed, 803 insertions, 0 deletions

diff --git a/board/mchpevb1/battery.c b/board/mchpevb1/battery.c
new file mode 100644
index 0000000000..2372affb64
--- /dev/null
+++ b/board/mchpevb1/battery.c
@@ -0,0 +1,230 @@
+/* Copyright 2015 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Battery pack vendor provided charging profile
+ */
+
+#include "battery.h"
+#include "battery_smart.h"
+#include "charge_state.h"
+#include "console.h"
+#include "ec_commands.h"
+#include "i2c.h"
+#include "util.h"
+
+/* Shutdown mode parameter to write to manufacturer access register */
+#define PARAM_CUT_OFF_LOW  0x10
+#define PARAM_CUT_OFF_HIGH 0x00
+
+/* Battery info for BQ40Z55 */
+static const struct battery_info info = {
+	.voltage_max = 8700,        /* mV */
+	.voltage_normal = 7600,
+	.voltage_min = 6000,
+	.precharge_current = 256,   /* mA */
+	.start_charging_min_c = 0,
+	.start_charging_max_c = 46,
+	.charging_min_c = 0,
+	.charging_max_c = 60,
+	.discharging_min_c = 0,
+	.discharging_max_c = 60,
+};
+
+const struct battery_info *battery_get_info(void)
+{
+	return &info;
+}
+
+int board_cut_off_battery(void)
+{
+	int rv;
+	uint8_t buf[3];
+
+	/* Ship mode command must be sent twice to take effect */
+	buf[0] = SB_MANUFACTURER_ACCESS & 0xff;
+	buf[1] = PARAM_CUT_OFF_LOW;
+	buf[2] = PARAM_CUT_OFF_HIGH;
+
+	i2c_lock(I2C_PORT_BATTERY, 1);
+	rv = i2c_xfer(I2C_PORT_BATTERY, BATTERY_ADDR, buf, 3, NULL, 0,
+		      I2C_XFER_SINGLE);
+	rv |= i2c_xfer(I2C_PORT_BATTERY, BATTERY_ADDR, buf, 3, NULL, 0,
+		       I2C_XFER_SINGLE);
+	i2c_lock(I2C_PORT_BATTERY, 0);
+
+	return rv;
+}
+
+#ifdef CONFIG_CHARGER_PROFILE_OVERRIDE
+
+static int fast_charging_allowed = 1;
+
+/*
+ * This can override the smart battery's charging profile. To make a change,
+ * modify one or more of requested_voltage, requested_current, or state.
+ * Leave everything else unchanged.
+ *
+ * Return the next poll period in usec, or zero to use the default (which is
+ * state dependent).
+ */
+int charger_profile_override(struct charge_state_data *curr)
+{
+	/* temp in 0.1 deg C */
+	int temp_c = curr->batt.temperature - 2731;
+	/* keep track of last temperature range for hysteresis */
+	static enum {
+		TEMP_RANGE_1,
+		TEMP_RANGE_2,
+		TEMP_RANGE_3,
+		TEMP_RANGE_4,
+		TEMP_RANGE_5,
+	} temp_range = TEMP_RANGE_3;
+	/* keep track of last voltage range for hysteresis */
+	static enum {
+		VOLTAGE_RANGE_LOW,
+		VOLTAGE_RANGE_HIGH,
+	} voltage_range = VOLTAGE_RANGE_LOW;
+
+	/* Current and previous battery voltage */
+	int batt_voltage;
+	static int prev_batt_voltage;
+
+	/*
+	 * Determine temperature range. The five ranges are:
+	 *   < 10C
+	 *   10-15C
+	 *   15-23C
+	 *   23-45C
+	 *   > 45C
+	 *
+	 * Add 0.2 degrees of hysteresis.
+	 * If temp reading was bad, use last range.
+	 */
+	if (!(curr->batt.flags & BATT_FLAG_BAD_TEMPERATURE)) {
+		if (temp_c < 99)
+			temp_range = TEMP_RANGE_1;
+		else if (temp_c > 101 && temp_c < 149)
+			temp_range = TEMP_RANGE_2;
+		else if (temp_c > 151 && temp_c < 229)
+			temp_range = TEMP_RANGE_3;
+		else if (temp_c > 231 && temp_c < 449)
+			temp_range = TEMP_RANGE_4;
+		else if (temp_c > 451)
+			temp_range = TEMP_RANGE_5;
+	}
+
+	/*
+	 * If battery voltage reading is bad, use the last reading. Otherwise,
+	 * determine voltage range with hysteresis.
+	 */
+	if (curr->batt.flags & BATT_FLAG_BAD_VOLTAGE) {
+		batt_voltage = prev_batt_voltage;
+	} else {
+		batt_voltage = prev_batt_voltage = curr->batt.voltage;
+		if (batt_voltage < 8200)
+			voltage_range = VOLTAGE_RANGE_LOW;
+		else if (batt_voltage > 8300)
+			voltage_range = VOLTAGE_RANGE_HIGH;
+	}
+
+	/*
+	 * If we are not charging or we aren't using fast charging profiles,
+	 * then do not override desired current and voltage.
+	 */
+	if (curr->state != ST_CHARGE || !fast_charging_allowed)
+		return 0;
+
+	/*
+	 * Okay, impose our custom will:
+	 * When battery is 0-10C:
+	 * CC at 486mA @ 8.7V
+	 * CV at 8.7V
+	 *
+	 * When battery is <15C:
+	 * CC at 1458mA @ 8.7V
+	 * CV at 8.7V
+	 *
+	 * When battery is <23C:
+	 * CC at 3402mA until 8.3V @ 8.7V
+	 * CC at 2430mA @ 8.7V
+	 * CV at 8.7V
+	 *
+	 * When battery is <45C:
+	 * CC at 4860mA until 8.3V @ 8.7V
+	 * CC at 2430mA @ 8.7V
+	 * CV at 8.7V until current drops to 450mA
+	 *
+	 * When battery is >45C:
+	 * CC at 2430mA @ 8.3V
+	 * CV at 8.3V (when battery is hot we don't go to fully charged)
+	 */
+	switch (temp_range) {
+	case TEMP_RANGE_1:
+		curr->requested_current = 486;
+		curr->requested_voltage = 8700;
+		break;
+	case TEMP_RANGE_2:
+		curr->requested_current = 1458;
+		curr->requested_voltage = 8700;
+		break;
+	case TEMP_RANGE_3:
+		curr->requested_voltage = 8700;
+		if (voltage_range == VOLTAGE_RANGE_HIGH)
+			curr->requested_current = 2430;
+		else
+			curr->requested_current = 3402;
+		break;
+	case TEMP_RANGE_4:
+		curr->requested_voltage = 8700;
+		if (voltage_range == VOLTAGE_RANGE_HIGH)
+			curr->requested_current = 2430;
+		else
+			curr->requested_current = 4860;
+		break;
+	case TEMP_RANGE_5:
+		curr->requested_current = 2430;
+		curr->requested_voltage = 8300;
+		break;
+	}
+
+	return 0;
+}
+
+/* Customs options controllable by host command. */
+#define PARAM_FASTCHARGE (CS_PARAM_CUSTOM_PROFILE_MIN + 0)
+
+enum ec_status charger_profile_override_get_param(uint32_t param,
+						  uint32_t *value)
+{
+	if (param == PARAM_FASTCHARGE) {
+		*value = fast_charging_allowed;
+		return EC_RES_SUCCESS;
+	}
+	return EC_RES_INVALID_PARAM;
+}
+
+enum ec_status charger_profile_override_set_param(uint32_t param,
+						  uint32_t value)
+{
+	if (param == PARAM_FASTCHARGE) {
+		fast_charging_allowed = value;
+		return EC_RES_SUCCESS;
+	}
+	return EC_RES_INVALID_PARAM;
+}
+
+static int command_fastcharge(int argc, char **argv)
+{
+	if (argc > 1 && !parse_bool(argv[1], &fast_charging_allowed))
+		return EC_ERROR_PARAM1;
+
+	ccprintf("fastcharge %s\n", fast_charging_allowed ? "on" : "off");
+
+	return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(fastcharge, command_fastcharge,
+			"[on|off]",
+			"Get or set fast charging profile");
+
+#endif	/* CONFIG_CHARGER_PROFILE_OVERRIDE */
diff --git a/board/mchpevb1/led.c b/board/mchpevb1/led.c
new file mode 100644
index 0000000000..7b9f7646cb
--- /dev/null
+++ b/board/mchpevb1/led.c
@@ -0,0 +1,174 @@
+/* Copyright 2017 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * Power and battery LED control for MEC1701 EVB.
+ */
+
+#include "battery.h"
+#include "charge_state.h"
+#include "chipset.h"
+#include "ec_commands.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "host_command.h"
+#include "led_common.h"
+#include "util.h"
+
+#define BAT_LED_ON 1
+#define BAT_LED_OFF 0
+
+#define CRITICAL_LOW_BATTERY_PERCENTAGE 3
+#define LOW_BATTERY_PERCENTAGE 10
+
+#define LED_TOTAL_4SECS_TICKS 4
+#define LED_TOTAL_2SECS_TICKS 2
+#define LED_ON_1SEC_TICKS 1
+#define LED_ON_2SECS_TICKS 2
+
+/*
+ * NOTE: GPIO_BAT_LED_xxx defined in board.h
+ */
+
+const enum ec_led_id supported_led_ids[] = {
+			EC_LED_ID_BATTERY_LED};
+
+const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
+
+enum led_color {
+	LED_OFF = 0,
+	LED_RED,
+	LED_AMBER,
+	LED_GREEN,
+	LED_COLOR_COUNT  /* Number of colors, not a color itself */
+};
+
+static int bat_led_set_color(enum led_color color)
+{
+	switch (color) {
+	case LED_OFF:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_OFF);
+		break;
+	case LED_RED:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_OFF);
+		break;
+	case LED_AMBER:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_ON);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_ON);
+		break;
+	case LED_GREEN:
+		gpio_set_level(GPIO_BAT_LED_RED, BAT_LED_OFF);
+		gpio_set_level(GPIO_BAT_LED_GREEN, BAT_LED_ON);
+		break;
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
+	return EC_SUCCESS;
+}
+
+void led_get_brightness_range(enum ec_led_id led_id,
+		uint8_t *brightness_range)
+{
+	brightness_range[EC_LED_COLOR_RED] = 1;
+	brightness_range[EC_LED_COLOR_GREEN] = 1;
+}
+
+static int board_led_set_color_battery(enum led_color color)
+{
+	return bat_led_set_color(color);
+}
+
+static int board_led_set_color(enum ec_led_id led_id, enum led_color color)
+{
+	int rv;
+
+	led_auto_control(led_id, 0);
+	switch (led_id) {
+	case EC_LED_ID_BATTERY_LED:
+		rv = board_led_set_color_battery(color);
+		break;
+	default:
+		return EC_ERROR_UNKNOWN;
+	}
+	return rv;
+}
+
+int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
+{
+	if (brightness[EC_LED_COLOR_RED] != 0 &&
+	    brightness[EC_LED_COLOR_GREEN] != 0)
+		board_led_set_color(led_id, LED_AMBER);
+	else if (brightness[EC_LED_COLOR_RED] != 0)
+		board_led_set_color(led_id, LED_RED);
+	else if (brightness[EC_LED_COLOR_GREEN] != 0)
+		board_led_set_color(led_id, LED_GREEN);
+	else
+		board_led_set_color(led_id, LED_OFF);
+
+	return EC_SUCCESS;
+}
+
+static void board_led_set_battery(void)
+{
+#ifdef CONFIG_CHARGER
+	static int battery_ticks;
+	uint32_t chflags = charge_get_flags();
+
+	battery_ticks++;
+
+	/* BAT LED behavior:
+	 * Same as the chromeos spec
+	 * Green/Amber for CHARGE_FLAG_FORCE_IDLE
+	 */
+	switch (charge_get_state()) {
+	case PWR_STATE_CHARGE:
+		board_led_set_color_battery(LED_AMBER);
+		break;
+	case PWR_STATE_DISCHARGE:
+		/* Less than 3%, blink one second every two second */
+		if (!chipset_in_state(CHIPSET_STATE_ANY_OFF) &&
+			charge_get_percent() < CRITICAL_LOW_BATTERY_PERCENTAGE)
+			board_led_set_color_battery(
+				(battery_ticks % LED_TOTAL_2SECS_TICKS <
+				 LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
+		/* Less than 10%, blink one second every four seconds */
+		else if (!chipset_in_state(CHIPSET_STATE_ANY_OFF) &&
+			charge_get_percent() < LOW_BATTERY_PERCENTAGE)
+			board_led_set_color_battery(
+				(battery_ticks % LED_TOTAL_4SECS_TICKS <
+				 LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
+		else
+			board_led_set_color_battery(LED_OFF);
+		break;
+	case PWR_STATE_ERROR:
+		board_led_set_color_battery(
+			(battery_ticks % LED_TOTAL_2SECS_TICKS <
+			 LED_ON_1SEC_TICKS) ? LED_RED : LED_OFF);
+		break;
+	case PWR_STATE_CHARGE_NEAR_FULL:
+		board_led_set_color_battery(LED_GREEN);
+		break;
+	case PWR_STATE_IDLE: /* External power connected in IDLE */
+		if (chflags & CHARGE_FLAG_FORCE_IDLE)
+			board_led_set_color_battery(
+				(battery_ticks % LED_TOTAL_4SECS_TICKS <
+				 LED_ON_2SECS_TICKS) ? LED_GREEN : LED_AMBER);
+		else
+			board_led_set_color_battery(LED_GREEN);
+		break;
+	default:
+		/* Other states don't alter LED behavior */
+		break;
+	}
+#endif
+}
+
+
+static void led_second(void)
+{
+	if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
+		board_led_set_battery();
+}
+DECLARE_HOOK(HOOK_SECOND, led_second, HOOK_PRIO_DEFAULT);
diff --git a/board/mchpevb1/usb_pd_policy.c b/board/mchpevb1/usb_pd_policy.c
new file mode 100644
index 0000000000..933cd54cba
--- /dev/null
+++ b/board/mchpevb1/usb_pd_policy.c
@@ -0,0 +1,399 @@
+/* Copyright 2017 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "atomic.h"
+#include "charge_manager.h"
+#include "common.h"
+#include "console.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "host_command.h"
+#include "registers.h"
+#include "system.h"
+#include "task.h"
+#include "timer.h"
+#include "util.h"
+#include "usb_mux.h"
+#include "usb_pd.h"
+
+
+#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
+#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)
+
+
+#define PDO_FIXED_FLAGS (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP |\
+			 PDO_FIXED_COMM_CAP)
+
+/* fill in correct source and sink capabilities */
+const uint32_t pd_src_pdo[] = {
+		PDO_FIXED(5000, 1500, PDO_FIXED_FLAGS),
+};
+const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);
+
+const uint32_t pd_snk_pdo[] = {
+		PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
+		PDO_BATT(4750, 21000, 15000),
+		PDO_VAR(4750, 21000, 3000),
+};
+const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);
+
+int pd_is_valid_input_voltage(int mv)
+{
+	return 1;
+}
+
+void pd_transition_voltage(int idx)
+{
+	/* No-operation: we are always 5V */
+}
+
+int pd_set_power_supply_ready(int port)
+{
+	/* Disable charging */
+	gpio_set_level(port ? GPIO_USB_C1_CHARGE_EN_L :
+			      GPIO_USB_C0_CHARGE_EN_L, 1);
+	/* Provide VBUS */
+	gpio_set_level(port ? GPIO_USB_C1_5V_EN :
+			      GPIO_USB_C0_5V_EN, 1);
+
+	/* notify host of power info change */
+	pd_send_host_event(PD_EVENT_POWER_CHANGE);
+
+	return EC_SUCCESS; /* we are ready */
+}
+
+void pd_power_supply_reset(int port)
+{
+	/* Disable VBUS */
+	gpio_set_level(port ? GPIO_USB_C1_5V_EN :
+			      GPIO_USB_C0_5V_EN, 0);
+
+	/* notify host of power info change */
+	pd_send_host_event(PD_EVENT_POWER_CHANGE);
+}
+
+int pd_snk_is_vbus_provided(int port)
+{
+	return !gpio_get_level(port ? GPIO_USB_C1_VBUS_WAKE_L :
+				      GPIO_USB_C0_VBUS_WAKE_L);
+}
+
+int pd_board_checks(void)
+{
+	return EC_SUCCESS;
+}
+
+int pd_check_power_swap(int port)
+{
+	/*
+	 * Allow power swap as long as we are acting as a dual role device,
+	 * otherwise assume our role is fixed (not in S0 or console command
+	 * to fix our role).
+	 */
+	return pd_get_dual_role() == PD_DRP_TOGGLE_ON ? 1 : 0;
+}
+
+int pd_check_data_swap(int port, int data_role)
+{
+	/* Allow data swap if we are a UFP, otherwise don't allow */
+	return (data_role == PD_ROLE_UFP) ? 1 : 0;
+}
+
+int pd_check_vconn_swap(int port)
+{
+	/* in G3, do not allow vconn swap since pp5000_A rail is off */
+	return gpio_get_level(GPIO_PMIC_SLP_SUS_L);
+}
+
+void pd_execute_data_swap(int port, int data_role)
+{
+	/* Do nothing */
+}
+
+void pd_check_pr_role(int port, int pr_role, int flags)
+{
+	/*
+	 * If partner is dual-role power and dualrole toggling is on, consider
+	 * if a power swap is necessary.
+	 */
+	if ((flags & PD_FLAGS_PARTNER_DR_POWER) &&
+	    pd_get_dual_role() == PD_DRP_TOGGLE_ON) {
+		/*
+		 * If we are a sink and partner is not externally powered, then
+		 * swap to become a source. If we are source and partner is
+		 * externally powered, swap to become a sink.
+		 */
+		int partner_extpower = flags & PD_FLAGS_PARTNER_EXTPOWER;
+
+		if ((!partner_extpower && pr_role == PD_ROLE_SINK) ||
+		     (partner_extpower && pr_role == PD_ROLE_SOURCE))
+			pd_request_power_swap(port);
+	}
+}
+
+void pd_check_dr_role(int port, int dr_role, int flags)
+{
+	/* If UFP, try to switch to DFP */
+	if ((flags & PD_FLAGS_PARTNER_DR_DATA) && dr_role == PD_ROLE_UFP)
+		pd_request_data_swap(port);
+}
+/* ----------------- Vendor Defined Messages ------------------ */
+const struct svdm_response svdm_rsp = {
+	.identity = NULL,
+	.svids = NULL,
+	.modes = NULL,
+};
+
+int pd_custom_vdm(int port, int cnt, uint32_t *payload,
+		  uint32_t **rpayload)
+{
+	int cmd = PD_VDO_CMD(payload[0]);
+	uint16_t dev_id = 0;
+	int is_rw, is_latest;
+
+	/* make sure we have some payload */
+	if (cnt == 0)
+		return 0;
+
+	switch (cmd) {
+	case VDO_CMD_VERSION:
+		/* guarantee last byte of payload is null character */
+		*(payload + cnt - 1) = 0;
+		CPRINTF("version: %s\n", (char *)(payload+1));
+		break;
+	case VDO_CMD_READ_INFO:
+	case VDO_CMD_SEND_INFO:
+		/* copy hash */
+		if (cnt == 7) {
+			dev_id = VDO_INFO_HW_DEV_ID(payload[6]);
+			is_rw = VDO_INFO_IS_RW(payload[6]);
+
+			is_latest = pd_dev_store_rw_hash(port,
+							 dev_id,
+							 payload + 1,
+							 is_rw ?
+							 SYSTEM_IMAGE_RW :
+							 SYSTEM_IMAGE_RO);
+
+			/*
+			 * Send update host event unless our RW hash is
+			 * already known to be the latest update RW.
+			 */
+			if (!is_rw || !is_latest)
+				pd_send_host_event(PD_EVENT_UPDATE_DEVICE);
+
+			CPRINTF("DevId:%d.%d SW:%d RW:%d\n",
+				HW_DEV_ID_MAJ(dev_id),
+				HW_DEV_ID_MIN(dev_id),
+				VDO_INFO_SW_DBG_VER(payload[6]),
+				is_rw);
+		} else if (cnt == 6) {
+			/* really old devices don't have last byte */
+			pd_dev_store_rw_hash(port, dev_id, payload + 1,
+					     SYSTEM_IMAGE_UNKNOWN);
+		}
+		break;
+	case VDO_CMD_CURRENT:
+		CPRINTF("Current: %dmA\n", payload[1]);
+		break;
+	case VDO_CMD_FLIP:
+		usb_mux_flip(port);
+		break;
+#ifdef CONFIG_USB_PD_LOGGING
+	case VDO_CMD_GET_LOG:
+		pd_log_recv_vdm(port, cnt, payload);
+		break;
+#endif /* CONFIG_USB_PD_LOGGING */
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_USB_PD_ALT_MODE_DFP
+static int dp_flags[CONFIG_USB_PD_PORT_COUNT];
+/* DP Status VDM as returned by UFP */
+static uint32_t dp_status[CONFIG_USB_PD_PORT_COUNT];
+
+static void svdm_safe_dp_mode(int port)
+{
+	/* make DP interface safe until configure */
+	dp_flags[port] = 0;
+	dp_status[port] = 0;
+	usb_mux_set(port, TYPEC_MUX_NONE,
+		    USB_SWITCH_CONNECT, pd_get_polarity(port));
+}
+
+static int svdm_enter_dp_mode(int port, uint32_t mode_caps)
+{
+	/* Only enter mode if device is DFP_D capable */
+	if (mode_caps & MODE_DP_SNK) {
+		svdm_safe_dp_mode(port);
+		return 0;
+	}
+
+	return -1;
+}
+
+static int svdm_dp_status(int port, uint32_t *payload)
+{
+	int opos = pd_alt_mode(port, USB_SID_DISPLAYPORT);
+
+	payload[0] = VDO(USB_SID_DISPLAYPORT, 1,
+			 CMD_DP_STATUS | VDO_OPOS(opos));
+	payload[1] = VDO_DP_STATUS(0, /* HPD IRQ  ... not applicable */
+				   0, /* HPD level ... not applicable */
+				   0, /* exit DP? ... no */
+				   0, /* usb mode? ... no */
+				   0, /* multi-function ... no */
+				   (!!(dp_flags[port] & DP_FLAGS_DP_ON)),
+				   0, /* power low? ... no */
+				   (!!(dp_flags[port] & DP_FLAGS_DP_ON)));
+	return 2;
+};
+
+static int svdm_dp_config(int port, uint32_t *payload)
+{
+	int opos = pd_alt_mode(port, USB_SID_DISPLAYPORT);
+	int mf_pref = PD_VDO_DPSTS_MF_PREF(dp_status[port]);
+	int pin_mode = pd_dfp_dp_get_pin_mode(port, dp_status[port]);
+
+	if (!pin_mode)
+		return 0;
+
+	usb_mux_set(port, mf_pref ? TYPEC_MUX_DOCK : TYPEC_MUX_DP,
+		    USB_SWITCH_CONNECT, pd_get_polarity(port));
+
+	payload[0] = VDO(USB_SID_DISPLAYPORT, 1,
+			 CMD_DP_CONFIG | VDO_OPOS(opos));
+	payload[1] = VDO_DP_CFG(pin_mode,      /* pin mode */
+				1,             /* DPv1.3 signaling */
+				2);            /* UFP connected */
+	return 2;
+};
+
+/*
+ * timestamp of the next possible toggle to ensure the 2-ms spacing
+ * between IRQ_HPD.
+ */
+static uint64_t hpd_deadline[CONFIG_USB_PD_PORT_COUNT];
+
+#define PORT_TO_HPD(port) \
+	((port) ? GPIO_USB_C1_DP_HPD : GPIO_USB_C0_DP_HPD)
+
+static void svdm_dp_post_config(int port)
+{
+	dp_flags[port] |= DP_FLAGS_DP_ON;
+	if (!(dp_flags[port] & DP_FLAGS_HPD_HI_PENDING))
+		return;
+
+	gpio_set_level(PORT_TO_HPD(port), 1);
+
+	/* set the minimum time delay (2ms) for the next HPD IRQ */
+	hpd_deadline[port] = get_time().val + HPD_USTREAM_DEBOUNCE_LVL;
+}
+
+static int svdm_dp_attention(int port, uint32_t *payload)
+{
+	int rc;
+	int cur_lvl;
+	int lvl = PD_VDO_DPSTS_HPD_LVL(payload[1]);
+	int irq = PD_VDO_DPSTS_HPD_IRQ(payload[1]);
+	enum gpio_signal hpd = PORT_TO_HPD(port);
+
+	cur_lvl = gpio_get_level(hpd);
+
+	dp_status[port] = payload[1];
+
+	rc = 1; /* ack */
+	/* Its initial DP status message prior to config */
+	if (!(dp_flags[port] & DP_FLAGS_DP_ON)) {
+		if (lvl)
+			dp_flags[port] |= DP_FLAGS_HPD_HI_PENDING;
+		return rc;
+	}
+
+	if (irq & cur_lvl) {
+		uint64_t now = get_time().val;
+		/* wait for the minimum spacing between IRQ_HPD if needed */
+		if (now < hpd_deadline[port])
+			usleep(hpd_deadline[port] - now);
+
+		/* generate IRQ_HPD pulse */
+		gpio_set_level(hpd, 0);
+		usleep(HPD_DSTREAM_DEBOUNCE_IRQ);
+		gpio_set_level(hpd, 1);
+
+		/* set the minimum time delay (2ms) for the next HPD IRQ */
+		hpd_deadline[port] = get_time().val + HPD_USTREAM_DEBOUNCE_LVL;
+	} else if (irq & !cur_lvl) {
+		CPRINTF("ERR:HPD:IRQ&LOW\n");
+		rc = 0; /* nak */
+	} else {
+		gpio_set_level(hpd, lvl);
+		/* set the minimum time delay (2ms) for the next HPD IRQ */
+		hpd_deadline[port] = get_time().val + HPD_USTREAM_DEBOUNCE_LVL;
+	}
+
+	return rc;
+}
+
+static void svdm_exit_dp_mode(int port)
+{
+	svdm_safe_dp_mode(port);
+	gpio_set_level(PORT_TO_HPD(port), 0);
+}
+
+static int svdm_enter_gfu_mode(int port, uint32_t mode_caps)
+{
+	/* Always enter GFU mode */
+	return 0;
+}
+
+static void svdm_exit_gfu_mode(int port)
+{
+}
+
+static int svdm_gfu_status(int port, uint32_t *payload)
+{
+	/*
+	 * This is called after enter mode is successful, send unstructured
+	 * VDM to read info.
+	 */
+	pd_send_vdm(port, USB_VID_GOOGLE, VDO_CMD_READ_INFO, NULL, 0);
+	return 0;
+}
+
+static int svdm_gfu_config(int port, uint32_t *payload)
+{
+	return 0;
+}
+
+static int svdm_gfu_attention(int port, uint32_t *payload)
+{
+	return 0;
+}
+
+const struct svdm_amode_fx supported_modes[] = {
+	{
+		.svid = USB_SID_DISPLAYPORT,
+		.enter = &svdm_enter_dp_mode,
+		.status = &svdm_dp_status,
+		.config = &svdm_dp_config,
+		.post_config = &svdm_dp_post_config,
+		.attention = &svdm_dp_attention,
+		.exit = &svdm_exit_dp_mode,
+	},
+	{
+		.svid = USB_VID_GOOGLE,
+		.enter = &svdm_enter_gfu_mode,
+		.status = &svdm_gfu_status,
+		.config = &svdm_gfu_config,
+		.attention = &svdm_gfu_attention,
+		.exit = &svdm_exit_gfu_mode,
+	}
+};
+const int supported_modes_cnt = ARRAY_SIZE(supported_modes);
+#endif /* CONFIG_USB_PD_ALT_MODE_DFP */
+