From the Raspberry Pi3 - With the patch removed:
U-Boot> setenv usb_pgood_delay 2000 U-Boot> usb reset resetting USB... Bus usb@7e980000: USB DWC2 scanning bus usb@7e980000 for devices... unable to get device descriptor (error=-22) 6 USB Device(s) found scanning usb for storage devices... 1 Storage Device(s) found
The only way I found to make it work reliably was to have it retry in the usb_prepare_device().
Jason.
On 8/18/20 10:08 AM, Marek Vasut wrote:
On 8/18/20 4:34 PM, Jason Wessel wrote:
I have found through testing some USB 2 composite mouse/keyboard devices do not response to the usb_set_address call immediately following the port reset. It can take anywhere from 2ms to 20ms.
Does it work if you do
=> setenv usb_pgood_delay 2000
before your test ?