On Tue, Jun 23, 2020 at 6:17 AM Dennis Lee Bieber <[email protected]> wrote:
> On Mon, 22 Jun 2020 11:10:34 -0700 (PDT), in > gmane.comp.hardware.beagleboard.user Krzysztof Rosi?ski > <[email protected]> wrote: > > >The problem doesn't appear when we set the maximum speed to 'full-speed' > in > >the device tree. This isn't the solution for us due to a high-speed > device > >connected to the same bus. > > > >&usb1 { > > status = "okay"; > > dr_mode = "host"; > > maximum-speed = "full-speed"; > >}; > > > > Has a different brand of USB hub been tried? I could see some hubs > locking the entire bus to the speed of the slowest connected device. > {Not quite definitive: https://en.wikipedia.org/wiki/USB > """ > The throughput of each USB port is determined by the slower speed of either > the USB port or the USB device connected to the port. > """ > } > > {My apologies, but I'm unable to track just who is or is not using hubs in > that infernal top-posted response chain... I don't read messages from > bottom up.} > > We are certain that the LAN9514 operates on high-speed where it can and on full-speed on ports where a full-speed device is connected. We can decode only full-speed frames with Keysight, we don't have a tool to sample and decode high-speed traffic. We tested only LAN9514, this is what we have on our custom PCB. Based on the usbmon we can tell that 'descriptor request' is sent, based on the Keysight oscilloscope we know that this request doesn't reach the full-speed device. Is there any way to reset single USB hub port from Linux? We know that the problem is recovered when the musb_dsps module is reloaded. Please find usbmon captures attached. > -- > Dennis L Bieber > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/QBCoQ0n2Fas/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/u403ffle1nu26re210v0titcsa819bnto4%404ax.com > . > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAAUgxQJkjwis4xB7x8Q7f42BP%2Bz8iEfjte1d2zV9Dd%2BbSuMvKQ%40mail.gmail.com.
usblog-failure.pcap
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usblog-success.pcap
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