> Mauro,
>
> What do you suggest for this? Could we allocate coherent device memory
> using dma_declare_coherent_memory() ? This seems the only way to do it
> unless, video buffer layer does this when initializing the queue.
Or to be able to override the memory allocation in some way. Large
contiguous buffers are hard to get once a system has been running for a
while, so at least some buffers must be allocated up front and not on the
first open() or VIDIOC_REQBUFS call. I'm surprised that this issue hasn't
cropped up before.
Regards,
Hans
>
> Murali Karicheri
> Software Design Engineer
> Texas Instruments Inc.
> Germantown, MD 20874
> Phone : 301-515-3736
> email: m-karicheri2@xxxxxx
>
>>-----Original Message-----
>>From: linux-media-owner@xxxxxxxxxxxxxxx [mailto:linux-media-
>>owner@xxxxxxxxxxxxxxx] On Behalf Of Hans Verkuil
>>Sent: Thursday, July 30, 2009 10:26 AM
>>To: Karicheri, Muralidharan
>>Cc: Laurent Pinchart; Mauro Carvalho Chehab; Dongsoo, Nathaniel Kim;
>>v4l2_linux; Dongsoo Kim; �경민; jm105.lee@xxxxxxxxxxx;
>>ì�´ìâ??¸ë¬¸; ëÅ?â?¬Ã¬ï¿½Â¸ÃªÂ¸Â°; ê¹â?¬ÃË?â?¢Ã¬Â¤â?¬
>>Subject: RE: How to save number of times using memcpy?
>>
>>
>>> Hans,
>>>
>>> I don't see the code you are referring to. Here is the probe() from the
>>> next branch of v4l-dvb. Could you point out the code that does the
>>> allocation of frame buffers ? I had used this code as reference when
>>> developing vpfe capture driver.
>>>
>>> Murali
>>
>>My apologies, I got it mixed up with older versions of this driver. I see
>>that it now uses videobuf-dma-contig. This is going to be a real problem
>>since this makes it impossible (or at least very hard) to allocate memory
>>up front. I'm no expert on videobuf, but this is something that should be
>>addressed, especially in the dma-contig case.
>>
>>Regards,
>>
>> Hans
>>
>>--
>>Hans Verkuil - video4linux developer - sponsored by TANDBERG
>>
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>
>
>
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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