postproc: imx500: Use new ioctl for network weight loading #825
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Replace the use of the custom V4L2 control for passing the network weights file to the driver with the custom ioctl that was recently added to the driver. This necessitates reading the file in userspace since the driver now expects to be passed a buffer rather than the file descriptor. Signed-off-by: Daniel Scally <[email protected]>
djrscally
commented
Jun 17, 2025
| struct imx500_network_weights network_weights; | ||
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| network_weights.size = stat.st_size; | ||
| network_weights.data = malloc(stat.st_size); |
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Naturally, the moment I opened the PR I noticed that I never free this.
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I'm assuming this rework is halted. If not, please do reopen. |
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Hello
Working with the imx500 lately, the requirement for the network weights to be passed as a file descriptor gave me some pause, as I was instead storing them as database objects which meant I'd have had to write them out before passing them to the driver. I thought that switching the interface to expect a buffer / size would be a bit more flexible and possibly also a bit more upstream friendly. I opened a pull request for the kernel to implement that: raspberrypi/linux#6904. This pull request updates rpicam-apps to use the new ioctl instead of the removed control.
Thanks
Dan