Hi, On Sat, Jun 03, 2023 at 10:24:38PM +0300, Yehezkel Bernat wrote: > On Fri, Jun 2, 2023 at 12:11 PM Mika Westerberg > <mika.westerberg@xxxxxxxxxxxxxxx> wrote: > > > > When USB4 port is in offline mode (this mean there is no device > > attached) we want to keep the sideband up to make it possible to > > communicate with the retimers. In the same way there is no need to > > enable sideband transactions when the USB4 port is not offline as they > > are already up. > > > > For this reason make the enabling/disabling depend on the USB4 port > > offline status. > > I'm probably missing something here, but if we don't allow disabling it when the > port is offline, and when the port is online the sideband is enabled, when can > it be disabled? If we can manually disable it when the port is online, on > enablement we can't assume that it's already enabled just because the port > is online, as we might have manually disabled it earlier. We allow disabling them when the port is online. This all basically separates how the device attached and non-device attached handle the sideband communications.
