On 12/16/19 4:17 AM, Bin Meng wrote: > +Marek, > > On Mon, Dec 16, 2019 at 11:13 AM Yinbo Zhu <yinbo....@nxp.com> wrote: >> >> T1024RDB usb controller doesn't detect usb device at first usb start >> Add a delay that is greater than 10808 us can fix that issue, which >> delay if is less than 10808 us, issue is probabilistic occurrence >> >> => usb start >> starting USB... >> USB0: USB EHCI 1.00 >> USB1: USB EHCI 1.00 >> scanning bus 0 for devices... 1 USB Device(s) found >> scanning bus 1 for devices... 1 USB Device(s) found >> scanning usb for storage devices... 0 Storage Device(s) found >> => usb stop >> stopping USB.. >> => usb start >> starting USB... >> USB0: USB EHCI 1.00 >> USB1: USB EHCI 1.00 >> scanning bus 0 for devices... 2 USB Device(s) found >> scanning bus 1 for devices... 1 USB Device(s) found >> scanning usb for storage devices... 1 Storage Device(s) found >> => >> >> Signed-off-by: Yinbo Zhu <yinbo....@nxp.com> >> --- >> common/usb_hub.c | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/common/usb_hub.c b/common/usb_hub.c >> index 33aaeb8e44..6dd06696b2 100644 >> --- a/common/usb_hub.c >> +++ b/common/usb_hub.c >> @@ -486,6 +486,9 @@ static int usb_scan_port(struct usb_device_scan >> *usb_scan) >> return 0; >> } >> >> +#ifdef CONFIG_TARGET_T1024RDB >> + udelay(10808); >> +#endif > > This looks like a workaround. Is this a silicon errata?
Does setting usb_pgood_delay to e.g. 2000 help ?
