mt9t031 (was RE: [PATCH] adding support for setting bus parameters in sub device)

[Guennadi Liakhovetski <g.liakhovetski@gmx.de>]

On Wed, 10 Jun 2009, Karicheri, Muralidharan wrote:

> Guennadi,
> 
> Thanks for responding. I acknowledge I need to add
> master & slave information in the structure. Querying
> the capabilities from the sub device is a good feature.
> I will look into your references and let you know if I
> have any question.
> 
> I will send an updated patch based on this.
> 
> BTW, I have a question about the mt9t031.c driver. Could
> I use this driver to stream VGA frames from the sensor?

Sure, any size the chip supports (up to 2048x1536) and your host can 
handle.

> Is it possible to configure the driver to stream at a
> specific fps?

No, patches welcome.

> We have a version of the driver used internally
> and it can do capture and stream of Bayer RGB data at VGA,
> 480p, 576p and 720p resolutions. I have started integrating
> your driver with my vpfe capture driver and it wasn't very
> clear to me. Looks like driver calculates the timing parameters
> based on the width and height of the capture area.

Yes, it provides exposure control by setting shutter timing, and it 
emulates autoexposure by calculating shutter times from window geometry.

> We need
> streaming capability in the driver. This is how our driver works
> with mt9t031 sensor
> 		  raw-bus (10 bit)
> vpfe-capture  ----------------- mt9t031 driver
> 	  |					   |
> 	  V				         V
> 	VPFE	 				MT9T031
> 
> VPFE hardware has internal timing and DMA controller to
> copy data frame by frame from the sensor output to SDRAM.
> The PCLK form the sensor is used to generate the internal
> timing.

So, what is missing in the driver apart from the ability to specify 
a frame-rate?

Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/