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

[Daiane Angolini]

On Tue, Sep 16, 2014 at 11:00 AM, Eric Nelson
<eric.nelson at boundarydevices.com> wrote:
> 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!


+1

Daiane