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Subject[PATCH v4 14/15] usb: phy: msm: Handle disconnect events
Date
From: "Ivan T. Ivanov" <iivanov@mm-sol.com>

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

Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Cc: Pavankumar Kondeti <pkondeti@codeaurora.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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