High CPU load produced by USB (DW2)

Minas Harutyunyan Minas.Harutyunyan at synopsys.com
Mon Mar 5 22:45:45 PST 2018


On 3/5/2018 11:14 PM, Marek Vasut wrote:
> On 02/20/2018 06:51 AM, Minas Harutyunyan wrote:
> [...]
>>>>> Is there a way to reduce that or is that the absolute minimum in HS mode?
>>>> We already discussed, in this email thread earlier, why SOF interrupts
>>>> required and unmasked.
>>>> Only in case when connected device with CTRL+BLK EP's only (like flash
>>>> drive) and directly connected to cores root HUB, SOF's will be masked.
>>> That's the setup I have on Altera SoCFPGA, yet the SOFs are still present.
>> Could you please send verbose lsusb on connected to dwc2 device
> See attached
>> and driver debug log.
> What exactly do you mean by this one ?
Enable debugging messages and verbose debugging messages for dwc2 from 
make menuconfig. Provide dmesg starting from dwc2 load till HS device 
connected to dwc2 port and enumerated.



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