[PATCH 3.16 065/204] USB: dummy-hcd: fix connection failures (wrong speed)

[Ben Hutchings]

3.16.52-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>

commit fe659bcc9b173bcfdd958ce2aec75e47651e74e1 upstream.

The dummy-hcd UDC driver is not careful about the way it handles
connection speeds.  It ignores the module parameter that is supposed
to govern the maximum connection speed and it doesn't set the HCD
flags properly for the case where it ends up running at full speed.

The result is that in many cases, gadget enumeration over dummy-hcd
fails because the bMaxPacketSize byte in the device descriptor is set
incorrectly.  For example, the default settings call for a high-speed
connection, but the maxpacket value for ep0 ends up being set for a
Super-Speed connection.

This patch fixes the problem by initializing the gadget's max_speed
and the HCD flags correctly.

Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/usb/gadget/dummy_hcd.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -973,7 +973,12 @@ static int dummy_udc_probe(struct platfo
 	dum = *((void **)dev_get_platdata(&pdev->dev));
 	dum->gadget.name = gadget_name;
 	dum->gadget.ops = &dummy_ops;
-	dum->gadget.max_speed = USB_SPEED_SUPER;
+	if (mod_data.is_super_speed)
+		dum->gadget.max_speed = USB_SPEED_SUPER;
+	else if (mod_data.is_high_speed)
+		dum->gadget.max_speed = USB_SPEED_HIGH;
+	else
+		dum->gadget.max_speed = USB_SPEED_FULL;
 
 	dum->gadget.dev.parent = &pdev->dev;
 	init_dummy_udc_hw(dum);
@@ -2489,8 +2494,6 @@ static struct hc_driver dummy_hcd = {
 	.product_desc =		"Dummy host controller",
 	.hcd_priv_size =	sizeof(struct dummy_hcd),
 
-	.flags =		HCD_USB3 | HCD_SHARED,
-
 	.reset =		dummy_setup,
 	.start =		dummy_start,
 	.stop =			dummy_stop,
@@ -2519,8 +2522,12 @@ static int dummy_hcd_probe(struct platfo
 	dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
 	dum = *((void **)dev_get_platdata(&pdev->dev));
 
-	if (!mod_data.is_super_speed)
+	if (mod_data.is_super_speed)
+		dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
+	else if (mod_data.is_high_speed)
 		dummy_hcd.flags = HCD_USB2;
+	else
+		dummy_hcd.flags = HCD_USB11;
 	hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
 	if (!hs_hcd)
 		return -ENOMEM;