[PATCH V2 RFC 1/6] usb: dwc2: core: Avoid nonsense error in gadget mode

Eric Anholt eric at anholt.net
Tue Aug 16 09:22:56 PDT 2016

John Youn <John.Youn at synopsys.com> writes:

> On 7/26/2016 11:54 AM, Stefan Wahren wrote:
>> In gadget mode On bcm2835 platform the host tx fifo size could be zero.
>> So add zero to range and avoid such nonsense errors:
>> dwc2 20980000.usb: 0 invalid for host_nperio_tx_fifo_size.
>> dwc2 20980000.usb: Setting host_nperio_tx_fifo_size to 0
>> dwc2 20980000.usb: 0 invalid for host_perio_tx_fifo_size.
>> dwc2 20980000.usb: Setting host_perio_tx_fifo_size to 0
> Hi Stefan,
> Are those the power on reset values of GNPTXFSIZ and HPTXFSIZ?
> If these values can be 0, I think the patch is ok. But I'm not sure
> about that. I can check with some hardware engineers to see under what
> conditions this is possible.

FWIW, I don't see the firmware software doing any conditional setting of
these registers.
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