linux-kernel - Re: [PATCH] usb: gadget: uvc:change the UVC_NUM

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Message-ID: <874lnwlg60.fsf@linux.intel.com>
Date:   Mon, 08 Jan 2018 13:54:15 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Lipengcheng <lpc.li@...ilicon.com>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        Lipengcheng <lpc.li@...ilicon.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com> (maintainer:USB
        WEBCAM GADGET)
Subject: Re: [PATCH] usb: gadget: uvc:change the UVC_NUM_REQUESTS value


Hi,

Lipengcheng <lpc.li@...ilicon.com> writes:
> The value is 4, it can cache four descriptors. When streaming_interval = 1,
> it can tolerate 500us. Some busy scenes, it may be more than 500us because
> cpu scheduling is not timely. There will have some problems. It is better
> set to eight.
>
> Signed-off-by: Pengcheng Li <lpc.li@...ilicon.com>
> ---
>  drivers/usb/gadget/function/uvc.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
> index a64e07e..901487e 100644
> --- a/drivers/usb/gadget/function/uvc.h
> +++ b/drivers/usb/gadget/function/uvc.h
> @@ -90,7 +90,7 @@ extern unsigned int uvc_gadget_trace_param;
>   * Driver specific constants
>   */
>
> -#define UVC_NUM_REQUESTS           4
> +#define UVC_NUM_REQUESTS           8

if you want to be taken seriously, the bare minimum you can do is to use
scripts/get_maintainer.pl to help with a proper Cc list:

$ scripts/get_maintainer.pl -f drivers/usb/gadget/function/uvc.h
Laurent Pinchart <laurent.pinchart@...asonboard.com> (maintainer:USB WEBCAM GADGET)
Felipe Balbi <balbi@...nel.org> (maintainer:USB GADGET/PERIPHERAL SUBSYSTEM)
Greg Kroah-Hartman <gregkh@...uxfoundation.org> (supporter:USB SUBSYSTEM)
linux-usb@...r.kernel.org (open list:USB WEBCAM GADGET)
linux-kernel@...r.kernel.org (open list)

Laurent, what do you think about this?

-- 
balbi

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