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

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Date:   Wed, 8 May 2019 08:10:50 +0000
From:   Anurag Kumar Vulisha <anuragku@...inx.com>
To:     "Claus H. Stovgaard" <cst@...seone.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
CC:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: gadget: configfs: Add lpm_Ux_disable

Hi Claus & Thinh,

>-----Original Message-----
>From: Claus H. Stovgaard [mailto:cst@...seone.com]
>Sent: Wednesday, May 08, 2019 2:59 AM
>To: Thinh Nguyen <Thinh.Nguyen@...opsys.com>; 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
><anuragku@...inx.com>
>Subject: Re: [PATCH] usb: gadget: configfs: Add lpm_Ux_disable
>
>Hi Thinh
>
>On tir, 2019-05-07 at 18:53 +0000, Thinh Nguyen wrote:
>> Claus H. Stovgaard wrote:
>> >
>> > 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://urldefense.proofpoint.com/v2/url?u=https-3A__www.spinic
>> > s.net_lists_linux-
>> >
>2Dusb_msg179732.html&d=DwIDaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=u9FYoxKtyh
>> > jrGFcyixFYqTjw1ZX0VsG2d8FCmzkTY-
>> >
>w&m=wKdyWmYpbW791LAm7rYwvFYx5E0bjENyXZzHvK4vyFo&s=es7kki6iuLJUp2rJn
>> > zP9alXKyfJPNSfyxTVCKKDd_rQ&e=
>> > [2] https://urldefense.proofpoint.com/v2/url?u=https-3A__www.spinic
>> > s.net_lists_linux-
>> >
>2Dusb_msg179393.html&d=DwIDaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=u9FYoxKtyh
>> > jrGFcyixFYqTjw1ZX0VsG2d8FCmzkTY-
>> >
>w&m=wKdyWmYpbW791LAm7rYwvFYx5E0bjENyXZzHvK4vyFo&s=cFTmO9wPf7b6TZx
>FU
>> > AAIJM0Z_wM1ttNIc1rct0uR6co&e=
>> >
>> >
>>
>> I'm not sure who will submit the patch to make change to DWC3 for
>> disabling U1/U2 (Anurag or you), but can you split your patch between
>> dwc3 and configfs.
>
>Have just written with Anurag, and he will submit a new patch set,
>where he has taken the control in ep0.c from my patch, and combined
>with his devicetree bindings. So the plan is to drop the configfs
>interface completely, keep the devicetree binding names (dis-u1-entry-
>quirk) and let it do 3 things.
>*Sets the latency to 0 in the BOS
>*Disable U1/U2 acceptence
>*Disable U1/U2 initiating
>This also include rejecting SET_SEL.
>
>We think this is the best option, and then dropping this patch as it
>is.
>
>I will just send and email later on this thread, when the patch is
>available on marc.info as a link for reference to the future.
>

I have sent the v2 patch series with the changes that Claus mentioned above.
The patch can be found here https://marc.info/?l=linux-kernel&m=155730212618388&w=2

Thanks,
Anurag Kumar Vulisha