On 09/02/2024 15:02, 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: Roger Quadros <rogerq@xxxxxxxxxx>
