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

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Message-ID: <Y6ca8IKLK9g497Qv@rowland.harvard.edu>
Date:   Sat, 24 Dec 2022 10:29:52 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Wesley Cheng <quic_wcheng@...cinc.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

On Fri, Dec 23, 2022 at 03:31:52PM -0800, Wesley Cheng wrote:
> For USB HCDs that can support multiple USB interrupters, expose functions
> that class drivers can utilize for setting up secondary interrupters.
> Class drivers can pass this information to its respective clients, i.e.
> a dedicated DSP.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> ---
>  drivers/usb/core/hcd.c  | 86 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/usb.h     |  7 ++++
>  include/linux/usb/hcd.h | 16 +++++++-
>  3 files changed, 108 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index 8300baedafd2..90ead90faf1d 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c

> +/**
> + * usb_hcd_stop_endpoint - Halt USB EP transfers
> + * @udev: usb device
> + * @ep: usb ep to stop
> + *
> + * Stop pending transfers on a specific USB endpoint.
> + **/
> +int usb_hcd_stop_endpoint(struct usb_device *udev,
> +					struct usb_host_endpoint *ep)
> +{
> +	struct usb_hcd *hcd = bus_to_hcd(udev->bus);
> +	int ret = 0;
> +
> +	if (hcd->driver->stop_endpoint)
> +		ret = hcd->driver->stop_endpoint(hcd, udev, ep);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(usb_hcd_stop_endpoint);

You know, there already is a function that does this.  It's named 
usb_hcd_flush_endpoint().  No need to add another function that does the 
same thing.

Alan Stern