Re: dwc2/dwc_otg drivers

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Hi Billy,

On 11/6/2017 2:45 PM, Felipe Balbi wrote:
> 
> Hi,
> 
> (please, always Cc linux-usb)
> 
> Billy Araujo <billyaraujo@xxxxxxxxx> writes:
>> I saw your contact on Linkedin and it seems you are specialist USB drivers
>> for Linux. I I am having an issue dwc2 driver generating lots of interrupts
>> 8000 /sec and was wondering if you could give me with some advice on that.
> 
> sounds like SOF interrupt is enabled.
> 
>> I saw the raspberry pi by uses a dwc_otg and doesn't seem to have that
>> issue.
>>
>> I don't understand very much what it is doing on the interrupts but when I
>> initialise a 3rd party kernel module and library it seems to process these
>> interrupts and the system becomes very slow. Do you think that installing
>> the raspberry pi version of the dwc_otg driver would help?
> 
> I would refrain from doing that and sticking to what's in the mainline
> kernel tree. If you have issues, please work with the MAINTAINER for
> that driver instead.
> 
> Also, remember to further describe what's going on, show some logs,
> kernel version, etc.
> 
> Without information, nobody will be able to help you.
> 
> Best of luck
> 

Yes, it SOF interrupts. SOF interrupt enabled only in host mode (non 
DescDMA mode) if any periodic EP in use. Without periodic EP SOF 
interrupt's dynamically disabled.

Thanks,
Minas
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