omap-L138 vpif driver for linux

it seems related to board configuration file for linux. I found the thread which ever discussed this issue, I try it on ti-processor-sdk-linux-omapl138-lcdk-06.03.00.106-Linux-x86-Install, the issue persisted. I think my configuration file is wrong, where to find a right configuration.

e2e.ti.com/.../1187210

Hello,

Unfortunately, we do not have any out of box example for VPIF and I can only provide limited support. With regards to the configuration, I would recommend you to check your linux build directory. It should contain a ".config" file and you could verify if the appropriate configs are set. 

Also, the driver for VPIF capture is in the following directory "drivers/media/platform/davinci/vpif_capture.c". The error happens in the vpif_probe function and it could be that the camera board is not getting detected. There is also a VPIF devicetree bindings that you could review in the following directory "Documentation/devicetree/bindings/media/ti,da850-vpif.txt".

Regards,
Krunal

These two days, I made effort in the vpif driver of L138 for linux. but the vpif_catpture driver can't work yet.I think this issue came from dts configuration. I have no idea on it, could you take a look at it? here is the log:

vpif 1e17000.video: vpif probe success
sysfs: cannot create duplicate filename '/bus/platform/devices/vpif_capture'
CPU: 0 PID: 117 Comm: systemd-udevd Not tainted 4.19.59-g5f8c1c6121 #1
Hardware name: Generic DA850/OMAP-L138/AM18x
Backtrace:
[<c00147b8>] (dump_backtrace) from [<c0014a30>] (show_stack+0x18/0x1c)
r7:cb4fcd60 r6:cb4fcd60 r5:cdc8c540 r4:cd670000

Hello,

Is that a different error than before? Also, please share a snippet of your DT file.

Regards,
Krunal

I change kernel configuration, and enable cmos sensor, then was told that error. Even the cmos is not set in dts, the driver of vpif and vpif_capture should work, I think.

who can give me help?

who can give me a help?

who can give me a help?

Hello,

TI did not test the VPIF driver for SDK 6.3, so we cannot support it. We have offered what support we can. You are starting to get into the realm of driver development, which we cannot support on these forums.

Regards,
Krunal

It doesn't matter, if TI did not test the VPIF driver for SDK 6.3. I don't insist on this version.I just want to know which version has a workable VPIF driver for OMAPL138 linux. After I am able to make VPIF driver work correctly in linux with certain version, I can continue to develop it with new feature by myself.

The VPIF driver can't work for SDK 6.3.108, it was ever a common issue. It comes posible from many factors,such as driver architechture, kernel configuration, or dtb setting, it is going to cost a long time if I do it by myself. I find a thread in e2e, in which this issue was resolved, however, I used same way to update kernel configuration, the linux can't boot. I can't know the reseaon.

In one word, I just want to know which OMAPL138 SDK version contains a VPIF driver to work correctly with default configuration or with little update.

who can give me a help?

Hello,

Please refer to Nick's response in the following thread: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/987571/omap-l138-video-capture-demo-on-linux/3651710#3651710

Regards,
Krunal

I just want to know which version of SDK for omap-l138 VPIF is able to load vpif driver correctly, and I can find 2 devices,video0 and video1, in the /dev of board filesystem? TI released many versions, why nobody knows what is contained in every version? 

who can help me?

who can tell me which omap-l138 sdk version is able to creat device /dev/video0 with default configuration?

who can tell me which omap-l138 sdk version is able to creat device /dev/video0 with default configuration?

who can tell me which omap-l138 sdk version is able to creat device /dev/video0 with default configuration?

who can tell me which omap-l138 sdk version is able to creat device /dev/video0 with default configuration?

I use a similar boar file to this one. but it uses video decoder with bt656 interface. I need a board file with cmos sensor dvp interface board file as templette to update my board file. the mt9p031 driver can't always register subdev.

Hello,

I would recommend you to check our Linux kernel github project: https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/. All the files are maintained on the repo and see if you could grep for the cmos sensor.

Regards,
Krunal