On Fri, Feb 09, 2024 at 02:02:12PM +0100, Andrejs Cainikovs wrote: > From: Andrejs Cainikovs <andrejs.cainikovs@xxxxxxxxxxx> > > AM62 USB works with some devices, while failing to operate with others. > > [ 560.189822] xhci-hcd xhci-hcd.4.auto: xHCI Host Controller > [ 560.195631] xhci-hcd xhci-hcd.4.auto: new USB bus registered, assigned bus number 2 > [ 574.388509] xhci-hcd xhci-hcd.4.auto: can't setup: -110 > [ 574.393814] xhci-hcd xhci-hcd.4.auto: USB bus 2 deregistered > [ 574.399544] xhci-hcd: probe of xhci-hcd.4.auto failed with error -110 > > This seems to be related to LPM (Link Power Management), and disabling it > turns USB into reliable working state. > > As per AM62 reference manual: > > > 4.8.2.1 USB2SS Unsupported Features > > > > The following features are not supported on this family of devices: > > ... > > - USB 2.0 ECN: Link Power Management (LPM) > > ... > > Fixes: 2240f96cf3cd ("arm64: dts: ti: k3-am62-main: Add support for USB") > Signed-off-by: Andrejs Cainikovs <andrejs.cainikovs@xxxxxxxxxxx> Reviewed-by: Francesco Dolcini <francesco.dolcini@xxxxxxxxxxx> Francesco