linux-kernel - Re: [PATCH v3 1/3] usb: gadget: add quirk_ep_out_aligned_size field to struct usb

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Message-ID: <20131030173349.GO12193@gimli>
Date:	Wed, 30 Oct 2013 12:33:49 -0500
From:	Felipe Balbi <balbi@...com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<stern@...land.harvard.edu>, <Paul.Zimmerman@...opsys.com>
Subject: Re: [PATCH v3 1/3] usb: gadget: add quirk_ep_out_aligned_size field
 to struct usb_gadget

Hi,

On Wed, Oct 30, 2013 at 10:06:16AM -0700, David Cohen wrote:
> Due to USB controllers may have different restrictions, usb gadget layer
> needs to provide a generic way to inform gadget functions to complain
> with non-standard requirements.
> 
> This patch adds 'quirk_ep_out_aligned_size' field to struct usb_gadget
> to inform when controller's epout requires buffer size to be aligned to
> MaxPacketSize.
> 
> Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> ---
>  include/linux/usb/gadget.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> index 942ef5e..9405d0f 100644
> --- a/include/linux/usb/gadget.h
> +++ b/include/linux/usb/gadget.h
> @@ -540,6 +540,9 @@ struct usb_gadget {
>  	struct device			dev;
>  	unsigned			out_epnum;
>  	unsigned			in_epnum;
> +
> +	/* epout requires buffer size to be aligned to MaxPacketSize */

please document this on the kernel-doc comment above.

-- 
balbi

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