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| conor-f | Hey everyone, I'm looking for some help with a video capture USB device. The device is "identified" and a V4L2 video device/extension is successfully initialized according to dmesg
But when I try open the device /dev/video2 in VLC, it complains about "unknown frame intervals" and "inappropriate ioctl" | [08:06] |
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| conor-f | (Double messaging as I just saw the topic saying only registered users can talk)
Hey everyone, I'm looking for some help with a video capture USB device. The device is "identified" and a V4L2 video device/extension is successfully initialized according to dmesg But when I try open the device /dev/video2 in VLC, it complains about "unknown frame intervals" and "inappropriate ioctl" | [08:24] |
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| mugnierb1 | hey, I have a driver that outputs "Consider updating driver xxx to match on endpoints". I digged the code to check what leads to this but I'm new to V4L2 and don't know what endpoints are. Can someone explain me what leads to this message or point me to any documentation? Thanks a ton | [10:12] |
| djrscally | Endpoints are a kind of representation in firmware of a connection between two devices
They're sort of sub-nodes of a Port in the firmware graph So for example a Sensor that's connected to a CSI2 receiver might have a port called Port@0 described, with an endpoint called Endpoint@0 And they'll contain properties that refer to the corresponding port and endpoint on the CSI2 receiver's firmware https://www.kernel.org/doc/html/latest/firmware-guide/acpi/dsd/graph.html That's the firmware graph page Or at least, that's the ACPI one. But the same concept exists in devicetree and software nodes | [10:20] |
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| djrscally | That message you received, as I understand it, means that ports/endpoints are _not_ described in this particular devices firmware, and instead the matching is done by direct reference to the device | [10:24] |
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| djrscally | Equivalent dt documentation: https://github.com/devicetree-org/dt-schema/blob/main/schemas/graph.yaml | [10:33] |
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| kbingham | mugnierb1, Which driver are you working on? | [11:12] |
| mugnierb1 | kbingham: i'm working on a company driver heavilly based on ov5640 | [11:14] |
| kbingham | mugnierb1, What CSI2 receiver are you using? | [11:15] |
| mugnierb1 | as i plan to upstream it i look into cleaning every warning possible | [11:15] |
| kbingham | The warning will be produced, not from the OV5640 driver, but the 'link' between that driver and the receiver when the receiver is parsing it's subdevices. | [11:16] |
| mugnierb1 | kbingham: my receiver (the endpoint i guess) is a csi1_ep, i'm on a raspi 4
so you mean it's the csi1_ep node that cause issue? | [11:17] |
| kbingham | Ok - so unicam ;-) | [11:17] |
| mugnierb1 | i guess so i'm new to this :) | [11:17] |
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| kbingham | mugnierb1, I think the unicam driver is still out-of-mainline. So you're working on the RPi tree, which is fine, but I think it means you can simply ignore the warning now. The fix should probably be done as part of upstreaming the unicam driver.
mugnierb1, upstreaming your sensor driver is still useful and valid though, as it can be connected to other CSI2 receivers. | [11:38] |
| mugnierb1 | kbingham: Yes I work on the rpi tree. I have a db410c to try my driver on, I'll check with this one once I rebuild the latest kernel for it, so I'll be on the linaro tree with another csi2 receiver. Thanks a ton for your help
May I ask what triggers the message just for my personnal knowledge? | [11:40] |
| pinchartl | mugnierb1: can you tell which sensor that is ?
(as you plan to upstream it I suppose the information may not be that confidential :-)) | [11:41] |
| mugnierb1 | pinchartl: I'm still waiting for my company formal approval. I hope next week but, you know anything can happen
I hope it's only a formality | [11:42] |
| pinchartl | as it's kernel code it's covered by the GPL, so you'll have to publish it anyway, even if you don't upstream it | [11:43] |
| mugnierb1 | indeed | [11:44] |
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| djrscally | mugnierb1: It should trigger when a subdev matches to an async notifier, but the fwnode used for the match is the subdev device's fwnode rather than an endpoint that's a child of the device's fwnode
At least that's my understanding of it | [12:05] |
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| mugnierb1 | djrscally: alright, thanks | [12:16] |
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