[RESEND][PATCH 3/3] usb.c: Add a retry in the usb_prepare_device()

[Jason Wessel]

>From the Raspberry Pi3 - With the patch removed:

U-Boot> setenv usb_pgood_delay 2000
U-Boot> usb reset
resetting USB...
Bus usb at 7e980000: USB DWC2
scanning bus usb at 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 ?
>