linux-kernel - Re: [PATCH v7 2/5] usb: gadget: add quirk_ep_out_aligned_size field to struct usb

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Message-ID: <20131210044117.GA28252@saruman.home>
Date:	Mon, 9 Dec 2013 22:41:57 -0600
From:	Felipe Balbi <balbi@...com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	Michal Nazarewicz <mina86@...a86.com>, <balbi@...com>,
	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <stern@...land.harvard.edu>
Subject: Re: [PATCH v7 2/5] usb: gadget: add quirk_ep_out_aligned_size field
 to struct usb_gadget

On Mon, Dec 09, 2013 at 07:35:19PM -0800, David Cohen wrote:
> On 12/09/2013 06:34 PM, Michal Nazarewicz wrote:
> > dOn Tue, Dec 10 2013, 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. A helper is also provided to align buffer size when
> >> necessary.
> >>
> >> Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
> >> Cc: Alan Stern <stern@...land.harvard.edu>
> >> Cc: Michal Nazarewicz <mina86@...a86.com>
> > 
> > Acked-by: Michal Nazarewicz <mina86@...a86.com>
> > 
> >> ---
> >>  include/linux/usb/gadget.h | 20 ++++++++++++++++++++
> >>  1 file changed, 20 insertions(+)
> >>
> >> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> >> index 23b3bfd0a842..cae8a6216551 100644
> >> --- a/include/linux/usb/gadget.h
> >> +++ b/include/linux/usb/gadget.h
> >> @@ -502,6 +502,8 @@ struct usb_gadget_ops {
> >>   *	only supports HNP on a different root port.
> >>   * @b_hnp_enable: OTG device feature flag, indicating that the A-Host
> >>   *	enabled HNP support.
> >> + * @quirk_ep_out_aligned_size: epout requires buffer size to be aligned to
> >> + *	MaxPacketSize.
> >>   *
> >>   * Gadgets have a mostly-portable "gadget driver" implementing device
> >>   * functions, handling all usb configurations and interfaces.  Gadget
> >> @@ -541,6 +543,7 @@ struct usb_gadget {
> >>  	unsigned			b_hnp_enable:1;
> >>  	unsigned			a_hnp_support:1;
> >>  	unsigned			a_alt_hnp_support:1;
> >> +	unsigned			quirk_ep_out_aligned_size:1;
> >>  };
> >>  #define work_to_gadget(w)	(container_of((w), struct usb_gadget, work))
> >>  
> >> @@ -559,6 +562,23 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
> >>  
> >>  
> >>  /**
> >> + * usb_ep_align_maybe - returns @len aligned to ep's maxpacketsize if gadget
> >> + *	requires quirk_ep_out_aligned_size, otherwise reguens len.
> > 
> > “returns”
> 
> I've got no idea how returns became reguens :)
> But maybe Felipe can fix it when applying?

Sure, but you owe me a beer hehe :-)

-- 
balbi

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