linux-kernel - Re: [PATCH] usb: gadget: configfs: Add lpm_Ux

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Date:   Tue, 7 May 2019 11:37:10 +0200
From:   "Claus H. Stovgaard" <cst@...seone.com>
To:     <linux-usb@...r.kernel.org>
CC:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>,
        "Anurag Kumar Vulisha" <anurag.kumar.vulisha@...inx.com>
Subject: Re: [PATCH] usb: gadget: configfs: Add lpm_Ux_disable

On Tue, 2019-05-07 at 11:09 +0200, Claus H. Stovgaard wrote:
> When combining dwc3 with an redriver for a USB Type-C device
> solution, it
> sometimes have problems with leaving U1/U2 for certain hosts,
> resulting in
> link training errors and reconnects. This create an interface via
> configfs for disabling U1/U2, enabling a workaround for devices based
> on
> dwc3.
> 

Sorry messed up a bit with a missing cover letter.
This feature relates to Anurag patch [1] and a thread [2] from earlier 

Where Anurags patch focus on setting U1/U2 latency in the BOS
descriptor from the devicetree, this patch focuses on having a configfs
interface for forcing the UDC (here the dwc3) to not enable U1/U2 and
reject the SET_SEL(U1/U2).

Looking forward to input.

[1] https://www.spinics.net/lists/linux-usb/msg179732.html
[2] https://www.spinics.net/lists/linux-usb/msg179393.html