linux-kernel - Re: [PATCH 0/6] usb: gadget: add mechanism to asynchronously validate data stage of ctrl out request

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Message-ID: <20181018124003.GD8763@uda0271908>
Date:   Thu, 18 Oct 2018 07:40:03 -0500
From:   Bin Liu <b-liu@...com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:     Paul Elder <paul.elder@...asonboard.com>,
        <kieran.bingham@...asonboard.com>, <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <balbi@...nel.org>, <stern@...land.harvard.edu>, <rogerq@...com>
Subject: Re: [PATCH 0/6] usb: gadget: add mechanism to asynchronously
 validate data stage of ctrl out request

Hi Laurent,

On Thu, Oct 18, 2018 at 02:42:29AM +0300, Laurent Pinchart wrote:
> Hi Bin,
> 
> On Thursday, 11 October 2018 22:31:42 EEST Bin Liu wrote:
> > On Tue, Oct 09, 2018 at 10:48:57PM -0400, Paul Elder wrote:
> > > This patch series adds a mechanism to allow asynchronously validating
> > > the data stage of a control out request, and for stalling or suceeding
> > > the request accordingly. This mechanism is implemented for MUSB, and is
> > > used by UVC. At the same time, UVC packages the setup stage and data
> > 
> > Why is this for MUSB only? Other UDC such as DWC3 doesn't need this?
> 
> Unfortunately, the asynchronous control request data stage validation 
> mechanism must be implemented by every UDC. This patch series only addresses 
> MUSB as this is Paul's main test platform. Once the core patches get reviewed 
> and the API accepted (possibly in a modified form), we plan to update the DWC2 
> and DWC3.

Thanks for the explanation.

Regards,
-Bin.