linux-kernel - [PATCH] usb: typec: tcpci: Enable bleed discharge when auto discharge is enabled

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Message-Id: <20201211071145.2199997-1-badhri@google.com>
Date:   Thu, 10 Dec 2020 23:11:45 -0800
From:   Badhri Jagan Sridharan <badhri@...gle.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Badhri Jagan Sridharan <badhri@...gle.com>
Subject: [PATCH] usb: typec: tcpci: Enable bleed discharge when auto discharge
 is enabled

Auto discharge circuits kick in only when vbus decays and reaches
VBUS_SINK_DISCONNECT_THRESHOLD threshold. Enable bleed discharge to
discharge vbus to VBUS_SINK_DISCONNECT_THRESHOLD upon disconnect.

Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
 drivers/usb/typec/tcpm/tcpci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index af5524338a63..f676abab044b 100644
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -725,6 +725,8 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data)
 		tcpci->tcpc.enable_auto_vbus_discharge = tcpci_enable_auto_vbus_discharge;
 		tcpci->tcpc.set_auto_vbus_discharge_threshold =
 			tcpci_set_auto_vbus_discharge_threshold;
+		regmap_update_bits(tcpci->regmap, TCPC_POWER_CTRL, TCPC_POWER_CTRL_BLEED_DISCHARGE,
+				   TCPC_POWER_CTRL_BLEED_DISCHARGE);
 	}
 
 	if (tcpci->data->vbus_vsafe0v)
-- 
2.29.2.576.ga3fc446d84-goog