reef: clear hpd bit in board level tcpc init

PD alternate mode is covered in tcpc interface. So tcpci_tcpm_init()
doesn't reset HPD. If keeping HDMI/DP type-C cable connected, doing
sysjump sets HPD signal to high while it's already high(this high comes
from previous state), then OS doesn't output to HDMI/DP monitor.
Reef Type-C port 1 follows TCPCI and has this issue.

BUG=chrome-os-partner:57689
BRANCH=none
TEST=Connect HDMI/DP type-C dongle, boot up system, OS detects HDMI/DP
monitor and extends screen to it; in console doing "sysjump RO"
or "sysjump RW", display goes out then comes back.

Change-Id: I12239a86490f29d0123fe8bad1b813d3be28d041
Signed-off-by: li feng <li1.feng@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/398444
Commit-Ready: Li1 Feng <li1.feng@intel.com>
Tested-by: Li1 Feng <li1.feng@intel.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/board/reef/board.c b/board/reef/board.c
index 22ca518c39..68d3e5f95c 100644
--- a/board/reef/board.c
+++ b/board/reef/board.c
@@ -303,6 +303,8 @@ void board_print_tcpc_fw_version(int port)
 
 void board_tcpc_init(void)
 {
+	int port;
+
 	/* Only reset TCPC if not sysjump */
 	if (!system_jumped_to_this_image())
 		board_reset_pd_mcu();
@@ -312,6 +314,16 @@ void board_tcpc_init(void)
 
 	/* Enable TCPC1 interrupt */
 	gpio_enable_interrupt(GPIO_USB_C1_PD_INT_ODL);
+
+	/*
+	* Initialize HPD to low; after sysjump SOC needs to see
+	* HPD pulse to enable video path
+	*/
+	for (port = 0; port < CONFIG_USB_PD_PORT_COUNT; port++) {
+		const struct usb_mux *mux = &usb_muxes[port];
+
+		mux->hpd_update(port, 0, 0);
+	}
 }
 DECLARE_HOOK(HOOK_INIT, board_tcpc_init, HOOK_PRIO_INIT_I2C+1);