linux-kernel - [PATCH 6/8] extcon: axp288: Use vbus-valid instead of -present to determine cable presence

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Message-Id: <20161219001313.13402-6-hdegoede@redhat.com>
Date:   Mon, 19 Dec 2016 01:13:11 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     linux-kernel@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>
Subject: [PATCH 6/8] extcon: axp288: Use vbus-valid instead of -present to determine cable presence

The vbus-present bit in the power status register also gets set to 1
when a usb-host cable (id-pin shorted to ground) is plugged in and a 5v
boost converter is supplying 5v to the otg usb bus.

This causes a "disconnect or unknown or ID event" warning in dmesg as
well as the extcon device to report the last detected charger cable
type as being connected even though none is connected.

This commit switches to checking the vbus-valid bit instead, which is
only 1 when both vbus is present and the vbus-path is enabled in the
vbus-path control register (the vbus-path gets disabled when a usb-host
cable is detected, to avoid the pmic drawing power from the 5v boost
converter).

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/extcon/extcon-axp288.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
index fc636f6..7aec413 100644
--- a/drivers/extcon/extcon-axp288.c
+++ b/drivers/extcon/extcon-axp288.c
@@ -166,7 +166,7 @@ static int axp288_handle_chrg_det_event(struct axp288_extcon_info *info)
 		return ret;
 	}

-	vbus_attach = (pwr_stat & PS_STAT_VBUS_PRESENT);
+	vbus_attach = (pwr_stat & PS_STAT_VBUS_VALID);
 	if (!vbus_attach) {
 		dev_info(info->dev, "vbus/cable disconnected\n");
 		goto no_vbus;
-- 
2.9.3