OMAP ISP and Overlay

OMAP ISP and Overlay

[Lane Brooks]

  Laurent,

So far I have the everything working with the OMAP ISP to where I can 
stream video on our custom board. On a previous generation of hardware 
with a completely different processor and sensor, we used the V4L2 
overlay feature to stream directly to our LCD for preview. I am 
wondering what the plans are for overlay support in the omap ISP? How 
does the overlay feature fit into the new media bus feature?

Thanks,
Lane

Re: OMAP ISP and Overlay

[Laurent Pinchart]

Hi Lane,

On Tuesday 24 August 2010 15:40:01 Lane Brooks wrote:
> 
> So far I have the everything working with the OMAP ISP to where I can stream
> video on our custom board.

Great news.

A new version of the ISP driver will soon be published with all the legacy 
code removed. We need a few days to setup the repository properly. You can 
already get a preview at http://git.linuxtv.org/pinchartl/media.git (omap3isp-
rx51 branch).

> On a previous generation of hardware with a completely different processor
> and sensor, we used the V4L2 overlay feature to stream directly to our LCD
> for preview. I am wondering what the plans are for overlay support in the
> omap ISP? How does the overlay feature fit into the new media bus feature?

The OMAP3 ISP driver won't support V4L2 overlay directly. However, you can use 
the USERPTR streaming mode and pass framebuffer memory directly to the ISP 
driver, resulting in DMA to the framebuffer and improved efficiency.

-- 
Regards,

Laurent Pinchart

RE: OMAP ISP and Overlay

[Hiremath, Vaibhav]

> -----Original Message-----
> From: linux-media-owner@vger.kernel.org [mailto:linux-media-
> owner@vger.kernel.org] On Behalf Of Laurent Pinchart
> Sent: Wednesday, August 25, 2010 2:56 PM
> To: Lane Brooks
> Cc: linux-media@vger.kernel.org
> Subject: Re: OMAP ISP and Overlay
> 
> Hi Lane,
> 
> On Tuesday 24 August 2010 15:40:01 Lane Brooks wrote:
> >
> > So far I have the everything working with the OMAP ISP to where I can
> stream
> > video on our custom board.
> 
> Great news.
> 
> A new version of the ISP driver will soon be published with all the legacy
> code removed. We need a few days to setup the repository properly. You can
> already get a preview at http://git.linuxtv.org/pinchartl/media.git
> (omap3isp-
> rx51 branch).
> 
> > On a previous generation of hardware with a completely different
> processor
> > and sensor, we used the V4L2 overlay feature to stream directly to our
> LCD
> > for preview. I am wondering what the plans are for overlay support in
> the
> > omap ISP? How does the overlay feature fit into the new media bus
> feature?
> 
> The OMAP3 ISP driver won't support V4L2 overlay directly. However, you can
> use
> the USERPTR streaming mode and pass framebuffer memory directly to the ISP
> driver, resulting in DMA to the framebuffer and improved efficiency.
> 

Sorry for late reply,

Just wanted to add on top of this, you could use V4L2 Display driver here which supports 2 video planes (over /dev/video0 & /dev/video1) along with both User pointer mode and MMAP mode of operation.

Thanks,
Vaibhav

> --
> Regards,
> 
> Laurent Pinchart
> --
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