nipperkin: support HDMI retimer low power

Add HDMI retimer:PI3HDX1204 low power mode support.

On board version 1:
Enable/disable retimer when DUT resume/suspend.

On board version > 1:
Disable retimer when DUT suspend/ not plug in
HDMI in S0.
Enable retimer when DUT in S0 with HDMI plug in.

BUG=b:201496586
BRANCH=none
TEST=verify HDMI monitor display normally with both
board id 1 and 2(manually update cbi and reworked).

Signed-off-by: Zick Wei <zick.wei@quanta.corp-partner.google.com>
Change-Id: I288bbec0786b7812c5fcb150bb20ff473b25287a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3192746
Reviewed-by: Rob Barnes <robbarnes@google.com>
Reviewed-by: Devin Lu <Devin.Lu@quantatw.com>

2 files changed, 46 insertions, 1 deletions

diff --git a/board/nipperkin/board.c b/board/nipperkin/board.c
index 2458ab0a2c..3c0b0b00e1 100644
--- a/board/nipperkin/board.c
+++ b/board/nipperkin/board.c
@@ -12,6 +12,7 @@
 #include "chipset.h"
 #include "common.h"
 #include "cros_board_info.h"
+#include "driver/retimer/pi3hdx1204.h"
 #include "driver/retimer/ps8811.h"
 #include "driver/retimer/ps8818.h"
 #include "driver/temp_sensor/sb_tsi.h"
@@ -29,8 +30,11 @@
 #include "temp_sensor/thermistor.h"
 #include "temp_sensor/tmp112.h"
 #include "thermal.h"
+#include "timer.h"
 #include "usb_mux.h"
 
+static void hdmi_hpd_interrupt(enum gpio_signal signal);
+
 #include "gpio_list.h" /* Must come after other header files. */
 
 /*
@@ -134,6 +138,8 @@ __override int board_c1_ps8818_mux_set(const struct usb_mux *me,
 
 static void board_init(void)
 {
+	if (get_board_version() > 1)
+		gpio_enable_interrupt(GPIO_HPD_EC_IN);
 }
 DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
 
@@ -322,17 +328,31 @@ static int board_get_temp(int idx, int *temp_k)
 	return get_temp_3v3_30k9_47k_4050b(idx, temp_k);
 }
 
+static int check_hdmi_hpd_status(void)
+{
+	if (get_board_version() > 1)
+		return gpio_get_level(GPIO_HPD_EC_IN);
+	else
+		return true;
+}
+
 /* Called on AP resume to S0 */
 static void board_chipset_resume(void)
 {
 	ioex_set_level(IOEX_HDMI_DATA_EN, 1);
 	ioex_set_level(IOEX_EN_PWR_HDMI, 1);
+	msleep(PI3HDX1204_POWER_ON_DELAY_MS);
+	pi3hdx1204_enable(I2C_PORT_TCPC1,
+		PI3HDX1204_I2C_ADDR_FLAGS,
+		check_hdmi_hpd_status());
 }
 DECLARE_HOOK(HOOK_CHIPSET_RESUME, board_chipset_resume, HOOK_PRIO_DEFAULT);
 
 /* Called on AP suspend */
 static void board_chipset_suspend(void)
 {
+	pi3hdx1204_enable(I2C_PORT_TCPC1,
+		PI3HDX1204_I2C_ADDR_FLAGS, 0);
 	ioex_set_level(IOEX_EN_PWR_HDMI, 0);
 	ioex_set_level(IOEX_HDMI_DATA_EN, 0);
 }
@@ -442,3 +462,28 @@ board_vivaldi_keybd_config(void)
 	else
 		return &keybd_wo_privacy_wo_kblight;
 }
+
+const struct pi3hdx1204_tuning pi3hdx1204_tuning = {
+	.eq_ch0_ch1_offset = PI3HDX1204_EQ_DB710,
+	.eq_ch2_ch3_offset = PI3HDX1204_EQ_DB710,
+	.vod_offset = PI3HDX1204_VOD_115_ALL_CHANNELS,
+	.de_offset = PI3HDX1204_DE_DB_MINUS5,
+};
+
+static void hdmi_hpd_handler(void)
+{
+	int hpd = check_hdmi_hpd_status();
+
+	ccprints("HDMI HPD %d", hpd);
+	pi3hdx1204_enable(I2C_PORT_TCPC1,
+			  PI3HDX1204_I2C_ADDR_FLAGS,
+			  chipset_in_or_transitioning_to_state(CHIPSET_STATE_ON)
+			  && hpd);
+}
+DECLARE_DEFERRED(hdmi_hpd_handler);
+
+static void hdmi_hpd_interrupt(enum gpio_signal signal)
+{
+	/* Debounce for 2 msec */
+	hook_call_deferred(&hdmi_hpd_handler_data, (2 * MSEC));
+}
diff --git a/board/nipperkin/gpio.inc b/board/nipperkin/gpio.inc
index ec35ce6c2c..4f4abca107 100644
--- a/board/nipperkin/gpio.inc
+++ b/board/nipperkin/gpio.inc
@@ -18,10 +18,10 @@ GPIO(C1_CHARGE_LED_WHITE_L,		PIN(7, 0), GPIO_OUT_HIGH)
 /* HDMI */
 IOEX(EN_PWR_HDMI,		EXPIN(USBC_PORT_C0, 0, 3), GPIO_OUT_LOW)
 IOEX(HDMI_DATA_EN,		EXPIN(USBC_PORT_C0, 1, 4), GPIO_OUT_LOW)
+GPIO_INT(HPD_EC_IN,		PIN(6, 2), GPIO_INT_BOTH, hdmi_hpd_interrupt)
 
 /* Test Points */
 GPIO(EC_GPIO56,			PIN(5, 6), GPIO_INPUT | GPIO_PULL_UP)
-GPIO(EC_PS2_RST,		PIN(6, 2), GPIO_INPUT | GPIO_PULL_UP)
 GPIO(EC_GPIOB0,			PIN(B, 0), GPIO_INPUT | GPIO_PULL_UP)
 GPIO(EC_GPIO81,			PIN(8, 1), GPIO_INPUT | GPIO_PULL_UP)
 GPIO(EC_FLPRG2,			PIN(8, 6), GPIO_INPUT | GPIO_PULL_UP)