linux-kernel - Re: [PATCH v1] arm64: dts: ti: k3-am62-main: disable usb lpm

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Date: Tue, 13 Feb 2024 12:43:28 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Andrejs Cainikovs <andrejs.cainikovs@...il.com>
Cc: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Aswath Govindraju <a-govindraju@...com>,
	Sjoerd Simons <sjoerd@...labora.com>,
	Andrejs Cainikovs <andrejs.cainikovs@...adex.com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] arm64: dts: ti: k3-am62-main: disable usb lpm

On Fri, Feb 09, 2024 at 02:02:12PM +0100, Andrejs Cainikovs wrote:
> From: Andrejs Cainikovs <andrejs.cainikovs@...adex.com>
> 
> 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@...adex.com>

Reviewed-by: Francesco Dolcini <francesco.dolcini@...adex.com>

Francesco