Kamil,
Can you take this driver as m2m maintainer or should I take it?
Regards,
Hans
On 10/15/2013 03:47 PM, Archit Taneja wrote:
> Hi Hans,
>
> On Friday 11 October 2013 01:16 PM, Hans Verkuil wrote:
>> On 10/09/2013 04:29 PM, Archit Taneja wrote:
>>> VPE is a block which consists of a single memory to memory path which can
>>> perform chrominance up/down sampling, de-interlacing, scaling, and color
>>> space
>>> conversion of raster or tiled YUV420 coplanar, YUV422 coplanar or YUV422
>>> interleaved video formats.
>>>
>>> We create a mem2mem driver based primarily on the mem2mem-testdev example.
>>> The de-interlacer, scaler and color space converter are all bypassed for now
>>> to keep the driver simple. Chroma up/down sampler blocks are implemented, so
>>> conversion beteen different YUV formats is possible.
>>>
>>> Each mem2mem context allocates a buffer for VPE MMR values which it will use
>>> when it gets access to the VPE HW via the mem2mem queue, it also allocates
>>> a VPDMA descriptor list to which configuration and data descriptors are
>>> added.
>>>
>>> Based on the information received via v4l2 ioctls for the source and
>>> destination queues, the driver configures the values for the MMRs, and
>>> stores
>>> them in the buffer. There are also some VPDMA parameters like frame start
>>> and
>>> line mode which needs to be configured, these are configured by direct
>>> register
>>> writes via the VPDMA helper functions.
>>>
>>> The driver's device_run() mem2mem op will add each descriptor based on how
>>> the
>>> source and destination queues are set up for the given ctx, once the list is
>>> prepared, it's submitted to VPDMA, these descriptors when parsed by VPDMA
>>> will
>>> upload MMR registers, start DMA of video buffers on the various input and
>>> output
>>> clients/ports.
>>>
>>> When the list is parsed completely(and the DMAs on all the output ports
>>> done),
>>> an interrupt is generated which we use to notify that the source and
>>> destination
>>> buffers are done.
>>>
>>> The rest of the driver is quite similar to other mem2mem drivers, we use the
>>> multiplane v4l2 ioctls as the HW support coplanar formats.
>>>
>>> Signed-off-by: Archit Taneja <arc...@ti.com>
>>
>> Acked-by: Hans Verkuil <hans.verk...@cisco.com>
>>
>
> Thanks for the Acks. Is it possible to queue these for 3.13?
>
> Archit
>
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