The max speed was always being set to USB_SUPER_SPEED
even when the phy was only capable of HIGH_SPEED. This
uses the value set for the phy to set the max for the
gadget. It resolves an issue with Window PCs where they
report that using a USB3.0 port would result in better
performance even when connecting through a 3.0 port. A
follow on patch will be needed to add USB_SPEED_HIGH_LPM
to support High Speed devices which also support LPM.
Signed-off-by: McCauley, Ben <ben.mccau...@garmin.com>
---
drivers/usb/dwc3/gadget.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 333a7c0..72d1a0e 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2709,7 +2709,15 @@ int dwc3_gadget_init(struct dwc3 *dwc)
}
dwc->gadget.ops = &dwc3_gadget_ops;
- dwc->gadget.max_speed = USB_SPEED_SUPER;
+ /*
+ * FIXME A new enumeration USB_SPEED_HIGH_LPM needs to be added
+ * to support USB 2.10. Setting max_speed to dwc->maximum_speed
+ * disables LPM support for devices which do not support
+ * SuperSpeed but are LPM capable.
+ */
+ if (dwc->maximum_speed < USB_SPEED_SUPER)
+ dev_info(dwc->dev, "SuperSpeed not supported.\n");
+ dwc->gadget.max_speed = dwc->maximum_speed;
dwc->gadget.speed = USB_SPEED_UNKNOWN;
dwc->gadget.sg_supported = true;
dwc->gadget.name = "dwc3-gadget";
--
1.9.1
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