[meta-freescale] OV5640 MIPI-CSI2 driver - why the limitations?

[Eric Nelson]

On 09/16/2014 06:43 AM, Daiane Angolini wrote:
> On Tue, Sep 16, 2014 at 10:25 AM, Jacob Pedersen <jp at circleconsult.dk> wrote:
>> Hi folks,
>>
>>
>>
>> I'm using a OmniVision OV5640 MIPI-CSI2 image sensor with a iMX6 Quad board,
>> and I'm doing some computer vision applications. I'm curious to know why the
>> driver for the OV5640 sensor is limited to 30 fps, even though the sensor
>> can do 60 fps at 720p and 90 fps at VGA? As far as I can see in the driver,
>> the frame rate is clamped to maximum 30 fps.
>>
>>
>>
>> Is there a technical reason, or is it just because it hasn't been updated
>> for all the supported modes?
>>
>>
>>
>> The driver also limits the available image formats, which makes one required
>> to do the conversion in software or (as in my case) using the IPU. The IPU
>> is fairly fast to do the simple UYVY to RGB24 conversion, but still slower
>> than just getting an RGB image from the sensor.
> 
> This limitation is due to the camera device driver. Only few
> configurations are implemented.
> 

Those I2C blobs are pretty difficult to get right!

Regards,


Eric