From: Veeraiyan Chidambaram <veeraiyan.chidambaram@xxxxxxxxxxxx>
In RCAR3 USB 3.0 Function, if host is detached an interrupt
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
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
properly and will become visible in the output of 'lsusb'.
Signed-off-by: Veeraiyan Chidambaram <veeraiyan.chidambaram@xxxxxxxxxxxx>
---
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);
+ }
+}
+
static void usb3_irq_epc_int_1_disable(struct renesas_usb3 *usb3)
{
usb3_stop_usb3_connection(usb3);
@@ -852,6 +865,9 @@ static void usb3_irq_epc_int_1(struct renesas_usb3 *usb3, u32 int_sta_1)
if (int_sta_1 & USB_INT_1_B2_RSUM)
usb3_irq_epc_int_1_resume(usb3);
+ if (int_sta_1 & USB_INT_1_B2_SPND)
+ usb3_irq_epc_int_1_suspend(usb3);
+
if (int_sta_1 & USB_INT_1_SPEED)
usb3_irq_epc_int_1_speed(usb3);
--
2.7.4
