Why do I see 10000s of USB interrupts?

Description

You can see excessive number of interrupts genereted by USB core on SoC devices using Linux kernel 4.15 and earlier. When low speed device (e.g. USB to Serial convertor) is connected to a SoC device via USB OTG cable,  tens of thousands of USB interrupts are generated during active communication with low speed device. 

Resolution

Issue has been fixed in Linux kernel 4.16 and 4.9.78-ltsi.