yorp: renegotiate Vbus down before hibernating

When we support the lowest power mode for Nuvoton in the next spin, we
will shed the TCPC/PPC power rail during hibernate. Before we drop the
power for the PPCs we need to ensure that Vbus is lower than the
hard-coded 6.8V dead-battery mode over-voltage threshold, otherwise we
will lock ourselves out of power.

BRANCH=none
BUG=b:79218851
TEST=verified that yorp renegotiates Vbus to 5V when entering hibernate
via ec `hibernate` cmd.

Change-Id: I4a98573eefb5757eea02dc48c64d5f9358b5e0b7
Signed-off-by: Jett Rink <jettrink@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1047954
Reviewed-by: Furquan Shaikh <furquan@chromium.org>

1 files changed, 0 insertions, 21 deletions

diff --git a/board/yorp/board.c b/board/yorp/board.c
index 8a7513768a..2606bdb1a3 100644
--- a/board/yorp/board.c
+++ b/board/yorp/board.c
@@ -201,27 +201,6 @@ static void board_chipset_suspend(void)
 }
 DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, board_chipset_suspend, HOOK_PRIO_DEFAULT);
 
-void board_hibernate(void)
-{
-	int port;
-
-	/*
-	 * To support hibernate called from console commands, ectool commands
-	 * and key sequence, shutdown the AP before hibernating.
-	 */
-	chipset_force_shutdown();
-
-	/* Added delay to allow AP power state machine to settle down */
-	msleep(100);
-
-	/*
-	 * Enable SINK_CTRL on the PPC. This is required to wake up from
-	 * hibernate when AC is connected. (b/79173959)
-	 */
-	for (port = 0; port < CONFIG_USB_PD_PORT_COUNT; port++)
-		ppc_vbus_sink_enable(port, 1);
-}
-
 enum adc_channel board_get_vbus_adc(int port)
 {
 	return port ? ADC_VBUS_C1 : ADC_VBUS_C0;