usb: dwc3: gadget: let us set lower max_speed

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commit b9e51b2b1f upstream.

In some SoCs, dwc3 is implemented as a USB2.0 only
core, meaning that it can't ever achieve SuperSpeed.

Currect driver always sets gadget.max_speed to
USB_SPEED_SUPER unconditionally. This can causes
issues to some Host stacks where the host will issue
a GetBOS() request and we will reply with a BOS
containing Superspeed Capability Descriptor.

At least Windows seems to be upset by this fact and
prints a warning that we should connect $this device
to another port.

[ balbi@ti.com : rewrote entire commit, including
source code comment to make a lot clearer what the
problem is ]

Signed-off-by: Ben McCauley <ben.mccauley@garmin.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ben McCauley 2015-11-16 10:47:24 -06:00 • committed by Greg Kroah-Hartman

parent 7ea7903e91

commit d23ccdaf7f

1 changed files with 23 additions and 1 deletions

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drivers/usb/dwc3/gadget.c

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