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: <52A68BF7.2080901@linux.intel.com>
Date:	Mon, 09 Dec 2013 19:35:19 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	Michal Nazarewicz <mina86@...a86.com>
CC:	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 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?

Br, David
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