linux-kernel - Re: [PATCH v2] usb: gadget: Increase max configuration interface to 32

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Message-ID: <f9dfbbf9-6357-49e2-bed0-f6b0dc71e554@quicinc.com>
Date: Fri, 12 Jul 2024 17:34:13 +0530
From: AKASH KUMAR <quic_akakum@...cinc.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jing Leng
	<jleng@...arella.com>, Felipe Balbi <balbi@...nel.org>,
        Pratham Pratap
	<quic_ppratap@...cinc.com>,
        Jack Pham <quic_jackp@...cinc.com>, <kernel@...cinc.com>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        "Vijayavardhan
 Vennapusa" <quic_vvreddy@...cinc.com>,
        Krishna Kurapati
	<quic_kriskura@...cinc.com>
CC: <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] usb: gadget: Increase max configuration interface to
 32

Gentle Reminder!!!

On 5/21/2024 11:12 AM, Akash Kumar wrote:
> Currently, max configuration interfaces are limited to 16, which fails
> for compositions containing 10 UVC configurations with interrupt ep
> disabled along with other configurations , and we see bind failures
> while allocating interface ID in uvc bind.
>
> Increase max configuration interface to 32 to support any large
> compositions, limited to the same size as USB device endpoints, as
> interfaces cannot be more than endpoints.
>
> Signed-off-by: Akash Kumar <quic_akakum@...cinc.com>
> ---
>   include/linux/usb/composite.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
> index 2040696d75b6..d6d4fbfb6d0e 100644
> --- a/include/linux/usb/composite.h
> +++ b/include/linux/usb/composite.h
> @@ -255,7 +255,7 @@ int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f,
>   int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f,
>   			struct usb_ep *_ep);
>   
> -#define	MAX_CONFIG_INTERFACES		16	/* arbitrary; max 255 */
> +#define	MAX_CONFIG_INTERFACES		32
>   
>   /**
>    * struct usb_configuration - represents one gadget configuration