diff options
Diffstat (limited to 'drivers/usb/gadget/atmel_usba_udc.c')
| -rw-r--r-- | drivers/usb/gadget/atmel_usba_udc.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/usb/gadget/atmel_usba_udc.c b/drivers/usb/gadget/atmel_usba_udc.c index f9326f0a7e7..72f68dba3a7 100644 --- a/drivers/usb/gadget/atmel_usba_udc.c +++ b/drivers/usb/gadget/atmel_usba_udc.c @@ -521,16 +521,16 @@ usba_udc_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered) static int usba_udc_pullup(struct usb_gadget *gadget, int is_on) { struct usba_udc *udc = to_usba_udc(gadget); - u32 ctrl; - - ctrl = usba_readl(udc, CTRL); + /* + * Some chips don't reliably drive DP/DM lines to high impedance when + * using the DETACH/PULLD_DIS bits. + * To ensure a reliable disconnect, power cycle the controller instead + */ if (is_on) - ctrl &= ~USBA_DETACH; + usba_writel(udc, CTRL, USBA_ENABLE_MASK); else - ctrl |= USBA_DETACH; - - usba_writel(udc, CTRL, ctrl); + usba_writel(udc, CTRL, USBA_DISABLE_MASK); return 0; } |