Re: [PATCH 4/5] usb: gadget/uvc: Port UVC webcam gadget to use videobuf2 framework

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On Fri, Jun 01, 2012 at 03:08:57PM +0530, Bhupesh Sharma wrote:
> This patch reworks the videobuffer management logic present in the UVC
> webcam gadget and ports it to use the "more apt" videobuf2 framework for
> video buffer management.
> 
> To support routing video data captured from a real V4L2 video capture
> device with a "zero copy" operation on videobuffers (as they pass from the V4L2
> domain to UVC domain via a user-space application), we need to support USER_PTR
> IO method at the UVC gadget side.
> 
> So the V4L2 capture device driver can still continue to use MMAO IO method
> and now the user-space application can just pass a pointer to the video buffers
> being DeQueued from the V4L2 device side while Queueing them at the UVC gadget
> end. This ensures that we have a "zero-copy" design as the videobuffers pass
> from the V4L2 capture device to the UVC gadget.
> 
> Note that there will still be a need to apply UVC specific payload headers
> on top of each UVC payload data, which will still require a copy operation
> to be performed in the 'encode' routines of the UVC gadget.
> 
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@xxxxxx>

this patch doesn't apply. Please refresh on top of v3.5-rc1 or my gadget
branch which I will update in a while.

-- 
balbi

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