[PATCH v2 0/4] dwc2: Speed up the interrupt handler quite a bit

The dwc2 interrupt handler is quite slow. On rk3288 with a few things plugged into the ports and with cpufreq locked at 696MHz (to simulate real world idle system), I can easily observe dwc2_handle_hcd_intr() taking > 120 us, sometimes > 150 us. Note that SOF interrupts come every 125 us with

[PATCH v2 0/4] dwc2: Speed up the interrupt handler quite a bit

The dwc2 interrupt handler is quite slow. On rk3288 with a few things plugged into the ports and with cpufreq locked at 696MHz (to simulate real world idle system), I can easily observe dwc2_handle_hcd_intr() taking > 120 us, sometimes > 150 us. Note that SOF interrupts come every 125 us with