linux-kernel - [PATCH v4 14/15] usb: phy: msm: Handle disconnect events

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Message-Id: <1384267910-32066-15-git-send-email-iivanov@mm-sol.com>
Date:	Tue, 12 Nov 2013 16:51:49 +0200
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, rob.herring@...xeda.com,
	pawel.moll@....com, mark.rutland@....com, swarren@...dotorg.org,
	ijc+devicetree@...lion.org.uk, davidb@...eaurora.org,
	linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Pavankumar Kondeti <pkondeti@...eaurora.org>
Subject: [PATCH v4 14/15] usb: phy: msm: Handle disconnect events

From: "Ivan T. Ivanov" <iivanov@...sol.com>

Put the transceiver in non-driving mode. Otherwise host
may not detect soft-disconnection.

Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
Cc: Pavankumar Kondeti <pkondeti@...eaurora.org>
---
 drivers/usb/phy/phy-msm-usb.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 1d88ff8..970f96b 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -260,6 +260,23 @@ static void ulpi_init(struct msm_otg *motg)
 	}
 }
 
+static int msm_phy_notify_disconnect(struct usb_phy *phy,
+				   enum usb_device_speed speed)
+{
+	int val;
+
+	/*
+	 * Put the transceiver in non-driving mode. Otherwise host
+	 * may not detect soft-disconnection.
+	 */
+	val = ulpi_read(phy, ULPI_FUNC_CTRL);
+	val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
+	val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
+	ulpi_write(phy, val, ULPI_FUNC_CTRL);
+
+	return 0;
+}
+
 static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)
 {
 	int ret;
@@ -1597,6 +1614,7 @@ static int __init msm_otg_probe(struct platform_device *pdev)
 
 	phy->init = msm_phy_init;
 	phy->set_power = msm_otg_set_power;
+	phy->notify_disconnect = msm_phy_notify_disconnect;
 
 	phy->io_ops = &msm_otg_io_ops;
 
-- 
1.7.9.5

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