Hi Veeraiyan, Thank you very much for the patch! I didn't realize that using USB_INT_1_B2_SPND can resolve such a behavior. I'd like to apply this patch into upstream, but I have some comments below.
> From: Veeraiyan Chidambaram, Sent: Wednesday, September 4, 2019 6:24 PM > > In RCAR3 USB 3.0 Function, if host is detached an interrupt I'd like to replace "RCAR3" with "R-Car Gen3". > will be generated and Suspended state bit is set in interrupt status > register. Interrupt handler will call driver->suspend(composite_suspend) > if suspended state bit is set. composite_suspend will call > ffs_func_suspend which will post FUNCTIONFS_SUSPEND and will be consumed > by user space application via /dev/ep0. > > To be able to detect the host detach, USB_INT_1_B2_SPND to cover the > Suspended bit of the B2_SPND_OUT[9] from the USB Status Register > (USB_STA) register and perform appropriate action in the > usb3_irq_epc_int_1 function. > > Without this commit, disconnection of the phone from R-Car-H3 ES2.0 s/R-Car-H3/R-Car H3/ > Salvator-X CN11 port is not recognized and reverse role switch does > not happen. If phone is connected again it does not enumerate. > > With this commit, disconnection will be recognized and reverse role > switch will happen. If phone is connected again it will enumerate IIUC, reverse role switch will happen by a user space application. Is it correct? > properly and will become visible in the output of 'lsusb'. > > Signed-off-by: Veeraiyan Chidambaram <[email protected]> > --- > drivers/usb/gadget/udc/renesas_usb3.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/drivers/usb/gadget/udc/renesas_usb3.c > b/drivers/usb/gadget/udc/renesas_usb3.c > index eaa3339b30a2..4ec703e302f5 100644 > --- a/drivers/usb/gadget/udc/renesas_usb3.c > +++ b/drivers/usb/gadget/udc/renesas_usb3.c > @@ -767,6 +767,19 @@ static void usb3_irq_epc_int_1_resume(struct > renesas_usb3 *usb3) > usb3_transition_to_default_state(usb3, false); > } > > +static void usb3_irq_epc_int_1_suspend(struct renesas_usb3 *usb3) > +{ > + usb3_disable_irq_1(usb3, USB_INT_1_B2_SPND); > + > + if (usb3->driver && > + usb3->driver->suspend && > + usb3->gadget.speed != USB_SPEED_UNKNOWN && > + usb3->gadget.state != USB_STATE_NOTATTACHED) { > + usb3->driver->suspend(&usb3->gadget); > + usb_gadget_set_state(&usb3->gadget, USB_STATE_SUSPENDED); I'd like to change the conditions like below if it still works on your environment. This is because I'd like to set the gadget state if other gadget driver except f_fs is used anyway. After that, a user also can recognize the state by using /sys/devices/platform/soc/ee020000.usb/udc/ee020000.usb/state even if the use doesn't use f_fs driver. if (usb3->gadget.speed != USB_SPEED_UNKNOWN && usb3->gadget.state != USB_STATE_NOTATTACHED) { if (usb3->driver && usb3->driver->suspend) usb3->driver->suspend(&usb3->gadget); usb_gadget_set_state(&usb3->gadget, USB_STATE_SUSPENDED); } Best regards, Yoshihiro Shimoda
