This is the a_set_b_hnp_enable flag in the OTG state machine
diagram and must be set when the A-Host has successfully set
the b_hnp_enable feature of the OTG-B-Peripheral attached to it.
When this bit changes we kick our OTG FSM to make note of the
change and act accordingly.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/usb/core/hub.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 38cc4ba..27e3b4c 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2273,6 +2273,7 @@ static int usb_enumerate_device_otg(struct usb_device *udev)
&& udev->parent == udev->bus->root_hub) {
struct usb_otg_descriptor *desc = NULL;
struct usb_bus *bus = udev->bus;
+ struct usb_hcd *hcd = bus_to_hcd(bus);
unsigned port1 = udev->portnum;
/* descriptor may appear anywhere in config */
@@ -2302,6 +2303,9 @@ static int usb_enumerate_device_otg(struct usb_device *udev)
dev_err(&udev->dev, "can't set HNP mode: %d\n",
err);
bus->b_hnp_enable = 0;
+ } else {
+ /* notify OTG fsm about a_set_b_hnp_enable */
+ usb_otg_kick_fsm(hcd->otg_dev);
}
} else if (desc->bLength == sizeof
(struct usb_otg_descriptor)) {
@@ -2312,10 +2316,14 @@ static int usb_enumerate_device_otg(struct usb_device *udev)
USB_DEVICE_A_ALT_HNP_SUPPORT,
0, NULL, 0,
USB_CTRL_SET_TIMEOUT);
- if (err < 0)
+ if (err < 0) {
dev_err(&udev->dev,
"set a_alt_hnp_support failed: %d\n",
err);
+ } else {
+ /* notify OTG fsm about a_set_b_hnp_enable */
+ usb_otg_kick_fsm(hcd->otg_dev);
+ }
}
}
#endif
@@ -4355,8 +4363,13 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1,
*/
if (!hdev->parent) {
delay = HUB_ROOT_RESET_TIME;
- if (port1 == hdev->bus->otg_port)
+ if (port1 == hdev->bus->otg_port) {
hdev->bus->b_hnp_enable = 0;
+#ifdef CONFIG_USB_OTG
+ /* notify OTG fsm about a_set_b_hnp_enable change */
+ usb_otg_kick_fsm(hcd->otg_dev);
+#endif
+ }
}
/* Some low speed devices have problems with the quick delay, so */
--
2.5.0
--
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