Commit b76baa81 authored Nov 09, 2012 by Peter Chen Committed by Greg Kroah-Hartman Nov 15, 2012

usb: refine phy notify operation during connection and disconnection

At commit 925aa46b, Richard Zhao
<richard.zhao@freescale.com> adds the phy notification callback
when port change occurs. In fact, this phy notification should
be added according to below rules:

1. Only set HW_USBPHY_CTRL.ENHOSTDISCONDETECT
during high speed host mode.
2. Do not set HW_USBPHY_CTRL.ENHOSTDISCONDETECT
during the reset and speed negotiation period.
3. Do not set HW_USBPHY_CTRL.ENHOSTDISCONDETECT
during host suspend/resume sequence.

Please refer: i.mx23RM(page: 413) for below rules.
http://www.freescale.com/files/dsp/doc/ref_manual/IMX23RM.pdf



Freescale i.MX SoC, i.mx23, i.mx28 and i.mx6(i.mx6SL does not
need to follow the 3rd rule) need to follow above rules.

Current code set connect notification (HW_USBPHY_CTRL.ENHOSTDISCONDETECT)
at hub_port_connect_change, it conflicts with above the 2th rule.

The correct notification setting method should be:
1. Set connect notify after the second bus reset.
2. Set disconnect notify after disconnection.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Tested-by: Mike Thompson <mpthompson@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 0e1a024d

drivers/usb/core/hub.c

+8 −8

Original line number	Diff line number	Diff line
		@@ -4038,6 +4038,9 @@ hub_port_init (struct usb_hub hub, struct usb_device udev, int port1,
		if (retval)
		goto fail;

		if (hcd->phy && !hdev->parent)
		usb_phy_notify_connect(hcd->phy, port1);

		/*
		* Some superspeed devices have finished the link training process
		* and attached to a superspeed hub port, but the device descriptor
		@@ -4232,8 +4235,12 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
		}

		/* Disconnect any existing devices under this port */
		if (udev)
		if (udev) {
		if (hcd->phy && !hdev->parent &&
		!(portstatus & USB_PORT_STAT_CONNECTION))
		usb_phy_notify_disconnect(hcd->phy, port1);
		usb_disconnect(&hub->ports[port1 - 1]->child);
		}
		clear_bit(port1, hub->change_bits);

		/* We can forget about a "removed" device when there's a physical
		@@ -4256,13 +4263,6 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
		}
		}

		if (hcd->phy && !hdev->parent) {
		if (portstatus & USB_PORT_STAT_CONNECTION)
		usb_phy_notify_connect(hcd->phy, port1);
		else
		usb_phy_notify_disconnect(hcd->phy, port1);
		}

		/* Return now if debouncing failed or nothing is connected or
		* the device was "removed".
		*/