[Buildroot] Camera Driver diesn't provide 60 FPS

[Buildroot] Camera Driver diesn't provide 60 FPS

[Gerd Kautzmann]

Dear audience,

I finally managed to build an linux image suporting my imx296 camera on the Raspberry-Pi 4 (32 bit) over loadable kernel modules. There where good examples for building a helloworld kernel module.
 
At first everything looked fine, but than I realised the camera is limited to 30 frames per second. I compiled a test program confirming the problem under the build root kernel. On a, standart Raspbi image (Debian) I got 60 fps using the same drivers (compiled and installed over dpkg) with the same settings in the boot-filesystem. The driver is reporting the camera to be able to do 60 fps but test program (and application) are only reaching 30 fps.

Are there any ideas about settings in the configuration concerning cameras I might have missed?

Thanks for your patience


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Re: [Buildroot] Camera Driver diesn't provide 60 FPS

[Thomas Petazzoni via buildroot]

Hello Gerd,

On Tue, 22 Aug 2023 09:39:06 +0000
Gerd Kautzmann <G.Kautzmann@PRIMES.de> wrote:

> I finally managed to build an linux image suporting my imx296 camera
> on the Raspberry-Pi 4 (32 bit) over loadable kernel modules. There
> where good examples for building a helloworld kernel module. At first
> everything looked fine, but than I realised the camera is limited to
> 30 frames per second. I compiled a test program confirming the
> problem under the build root kernel. On a, standart Raspbi image
> (Debian) I got 60 fps using the same drivers (compiled and installed
> over dpkg) with the same settings in the boot-filesystem. The driver
> is reporting the camera to be able to do 60 fps but test program (and
> application) are only reaching 30 fps.
> 
> Are there any ideas about settings in the configuration concerning
> cameras I might have missed?

This really isn't a Buildroot-related question, so I'm not sure this
mailing list is the most relevant place to get support on this
question. It's really a RaspberryPi-specific question.

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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