On 3/22/20 2:00 PM, Lukasz Majewski wrote: > This change provides some extra time for some slow (or degraded) USB devices > to become fully operational. > > This code is the port to newest U-Boot of the fix from - "rayvt" (from [1]). > > Links: > [1] - https://forum.doozan.com/read.php?3,35295,35295#msg-35295 > [2] - > https://www.dropbox.com/s/nrkrd1no63viuu8/uboot-bodhi-2016.05-timeoutTD.patch?dl=0 > > Signed-off-by: Lukasz Majewski <lu...@denx.de> > [Unfortunately, the original patch [2] did not contain S-o-B from the original > author - "rayvt"] > --- > > common/usb.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/common/usb.c b/common/usb.c > index 349e838f1d..305482b5bb 100644 > --- a/common/usb.c > +++ b/common/usb.c > @@ -925,14 +925,20 @@ static int get_descriptor_len(struct usb_device *dev, > int len, int expect_len) > __maybe_unused struct usb_device_descriptor *desc; > ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ); > int err; > + int retry = 5; > > desc = (struct usb_device_descriptor *)tmpbuf; > > +again: > err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, len); > if (err < expect_len) { > if (err < 0) { > - printf("unable to get device descriptor (error=%d)\n", > - err); > + printf("unable to get device descriptor (error=%d) > retry: %d\n", > + err, retry); > + mdelay(50);
Why 50 mSec and not some other value, like 100 mSec ?
