diff options
| author |   Peter Chen <peter.chen@freescale.com> | 2012-11-09 09:44:43 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-15 17:44:51 -0800 |
| commit | b76baa8154335a906be85f2b32d6bd1876900133 (patch) | |
| tree | 552aaeece187d66e026d89c47c800ff8c4167f1d | |
| parent | usb: mxs-phy: re-init phy during the connection is useless (diff) | |
| download | linux-dev-b76baa8154335a906be85f2b32d6bd1876900133.tar.xz linux-dev-b76baa8154335a906be85f2b32d6bd1876900133.zip | |
usb: refine phy notify operation during connection and disconnection
At commit 925aa46ba963a4da6d8ee6ab1d04a02ffa8db62b, 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>
| -rw-r--r-- | drivers/usb/core/hub.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 90accdefdc7d..8391538d688b 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -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". */ |