linux-kernel - Re: [RFC PATCH 06/14] usb: core: hcd: Introduce USB HCD APIs for interrupter management

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Message-ID: <559030ff-112b-e0a8-b278-72f909724496@quicinc.com>
Date:   Wed, 28 Dec 2022 12:31:16 -0800
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     Alan Stern <stern@...land.harvard.edu>,
        Oliver Neukum <oneukum@...e.com>
CC:     <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <gregkh@...uxfoundation.org>, <Thinh.Nguyen@...opsys.com>,
        <bgoswami@...cinc.com>, <tiwai@...e.com>, <robh+dt@...nel.org>,
        <agross@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <devicetree@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <quic_jackp@...cinc.com>, <quic_plai@...cinc.com>
Subject: Re: [RFC PATCH 06/14] usb: core: hcd: Introduce USB HCD APIs for
 interrupter management

Hi Alan,

On 12/28/2022 7:16 AM, Alan Stern wrote:
> On Wed, Dec 28, 2022 at 09:59:03AM +0100, Oliver Neukum wrote:
>>
>>
>> On 27.12.22 22:07, Wesley Cheng wrote:
>>
>>>
>>> Hmmm...maybe I should change the name of the API then to avoid the confusion.  Yes, usb_hcd_flush_endpoint() does ensure that URBs submitted to the EP are stopped.  However, with this offloading concept, we aren't actually submitting URBs from the main processor, so the ep->urb_list will be empty.
>>>
>>> This means the usb_hcd_flush_endpoint() API won't actually do anything.  What we need is to ensure that we send a XHCI stop ep command to the controller.
>>
>> That is a concept specific to XHCI, yet you are adding a generic
>> API. The namin should reflect that. usb_quiesce_endpoint() ?
> 
> Or even xhci_send_stop_ep_cmd(), which is what the routine is intended
> to do.
> 

Just to clarify, you're talking about renaming the API that was added in 
the XHCI driver, correct?

Thanks
Wesley Cheng