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

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Message-ID: <2629cd30-23aa-4f03-8452-ae13297fd6b6@kernel.org>
Date: Mon, 12 Feb 2024 14:13:56 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Andrejs Cainikovs <andrejs.cainikovs@...il.com>,
 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>
Cc: Andrejs Cainikovs <andrejs.cainikovs@...adex.com>,
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, "Bin Liu [EP]" <b-liu@...com>,
 "Gunasekaran, Ravi" <r-gunasekaran@...com>
Subject: Re: [PATCH v1] arm64: dts: ti: k3-am62-main: disable usb lpm

Hi Andrejs,

On 09/02/2024 15:02, Andrejs Cainikovs wrote:
> From: Andrejs Cainikovs <andrejs.cainikovs@...adex.com>
> 
> AM62 USB works with some devices, while failing to operate with others.

Could you please share which devices failed to work for you?

> 
> [  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>
> ---
>  arch/arm64/boot/dts/ti/k3-am62-main.dtsi | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> index 464b7565d085..c49fbce5cb70 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-main.dtsi
> @@ -640,6 +640,8 @@ usb0: usb@...00000 {
>  			interrupt-names = "host", "peripheral";
>  			maximum-speed = "high-speed";
>  			dr_mode = "otg";
> +			snps,usb2-gadget-lpm-disable;
> +			snps,usb2-lpm-disable;
>  		};
>  	};
>  
> @@ -663,6 +665,8 @@ usb1: usb@...00000 {
>  			interrupt-names = "host", "peripheral";
>  			maximum-speed = "high-speed";
>  			dr_mode = "otg";
> +			snps,usb2-gadget-lpm-disable;
> +			snps,usb2-lpm-disable;
>  		};
>  	};
>  

Instead of this could you please check if this series fixes the issue for you?
https://lore.kernel.org/all/20240205141221.56076-1-rogerq@kernel.org/

-- 
cheers,
-roger