usb: chipidea: udc: bypass pullup DP when gadget connect in OTG fsm mode

By pass pullup DP in OTG fsm mode when do gadget connect, to let it handled
by OTG state machine.

This patch can fix the problem you found with my HNP polling patchset after
below 3 patches introduced:
467a78c usb: chipidea: udc: apply new usb_udc_vbus_handler interface
628ef0d usb: udc: add usb_udc_vbus_handler
dfea9c9 usb: udc: store usb_udc pointer in struct usb_gadget

Problem:
- Connect USB cable and MicroAB cable between two boards
- Boot up two boards
- load g_mass_storage at B-device side, the enumeration will success,
and A will see a usb mass-storage device
- load g_mass_storage at A-device side, the problem has occurred, the
connection will be lost at the beginning, then connect again.

This patch is based on
commit eff933c1d3a2e046492b3dfc86db813856553a29
(chipidea: pci: make it depends on NOP_USB_XCEIV)
on branch peter-usb-dev of
git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git

Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 41914a5..764f668 100644 (file)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1574,6 +1574,10 @@ static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
 {
        struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
 
+       /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
+       if (ci_otg_is_fsm_mode(ci))
+               return 0;
+
        pm_runtime_get_sync(&ci->gadget.dev);
        if (is_on)
                hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);