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| Who | What | When | |
|---|---|---|---|
| paulk | oh wow and it's mipi csi-2
another thing is to have a driver for canon lenses it's a SPI-like interface and there are cheap EF to C-mount adapter where you can drill holes to attach cables to the pogo pins to the lens because tbh optics make a huge difference | [00:00] | |
| kbingham | Ohh driving the lenses will be interesting
Absolutely. | [00:02] | |
| paulk | but for now I'd rather build a blutooth follow-focus for the blackmagic
rotary encoder kind of stuff, a few preset buttons nrf something with zephyr | [00:02] | |
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| pinchartl | mriesch: knowing what streams carries what data requires acquiring that knowledge in userspace "somehow". it can be considered an intrinsic property of that particular sensor driver that userspace would need to know about. better, it could be standardized in V4L2 for categories of devices (e.g. for sensor with multi-exposure, stream 0 is always short and stream 1 always long). or it could be
exposed through an API (e.g. read-only controls, or adding a new ioctl to discover stream properties) frame descriptors could be extended to provide more information within the kernel, possibly and V4L2_SUBDEV_ROUTE_FL_SOURCE was dropped but will be replaced by something similar | [06:39] | |
| mriesch | pinchartl: i could imagine you need a similar mechanism for the sensor driver you are working on?
what kind of embedded data does it transmit? | [06:41] | |
| pinchartl | the embedded data is a few lines at the start of the image that contains information such as the exposure time used to capture the frame
Sakari has posted a patch series to add embedded data support to V4L2 | [06:51] | |
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| mriesch | pinchartl: ah yes, found it..
is there wip on the FL_SOURCE (or ITS successor)? | [07:28] | |
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| mriesch | ah, FL_INTERNAL seems to be the new thing... should have read the cover letter first | [07:38] | |
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| pinchartl | yes, that's the one | [07:47] | |
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| jmassot | lplc: Hi, I'm looking at how to add support for pixel mode in the MAX9671{4,7} driver
lplc: after looking at the MAX96717 FRONTTOP register, in case we don't select a datatype then all the traffic is forwared to the gmsl link lplc: so the current driver could work for you, are you selecting anything with the mem_dt* registers ? | [13:37] | |
| lplc | jmassot: hi, yes, I'm filtering only the pixel data for now. The sensor also outputs a bunch of statistics and test patterns with different data types that I don't need | [13:44] | |
| jmassot | lplc: ok same here | [13:45] | |
| lplc | Later, I'll work on implementing the embedded data as a different stream, in which case I'll need to alow that data type to pass as well. For now, I have it embedded in the image | [13:46] | |
| jmassot | lplc: that's exactly what I'm doing with the vgxy61 driver on top of the sailus metadata branch
lplc: https://pastebin.com/raw/WNKJP422 | [13:47] | |
| lplc | jmassot: our corporate firewalls do not allow access to pastebin, unfortunately... :/ | [13:49] | |
| jmassot | lplc: hehe I added multistream support for the vgx61 so that it correctly reports a second metadata stream on an internal pad
lplc: so now that I have two streams available on the sensor I can start looking at dt filtering in the serializer | [13:50] | |
| lplc | for just 2 streams you only need to set FRONTTOP_16 and FRONTTOP_17 with the right DT
to allow the data to pass | [13:52] | |
| jmassot | lplc: yes but the annoying thing will be to check if all the selected datatype have the same bpp
lplc: and we will have to maintain a table with all the mipi datatype and their bpp lplc: the other solution is not filter anything so all DT goes to the GMSL link | [13:53] | |
| lplc | jmassot: not sure I get it why you need to check or why they need to have same bpp. By default, max96717 uses DT to know the bpp of the stream | [14:00] | |
| jmassot | lplc: Oh I was thinking that we should not mixed different streams of different bpp in the same video pipe | [14:01] | |
| lplc | in my case the pixel data is RAW16 and the embedded data is 8-bit
when I was experimenting with having embedded data separate, I could see the data just fine on a MIPI analyzer | [14:03] | |
| pinchartl | lplc: you have a CSI-2 analyzer ? lucky you | [14:07] | |
| lplc | pinchartl: I know :) | [14:08] | |
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| jmassot | lplc: pinchartl: I want one too :) | [14:10] | |
| pinchartl | I'm sure kbingham has a camera module or two he would like you to test ;-) | [14:11] | |
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| jmassot | lplc: so I can prepare something for the pixel mode which filter the dt using mem_dtx_sel
lplc: one other question in pixel mode is how to retrieve the stream id properly on the deserializer | [14:12] | |
| lplc | don't remember which deserializer you were using, but the one we're using (max96724) has 16 filter registers per video pipe and you can actually reassign an incoming dt on a vc to another vc and/or dt | [14:16] | |
| jmassot | lplc: I don't plan to reassign dt/vc on the max96714 but there is a stream id to select at the deserializer side. In fact it just works because the max96717 and max96714 are using '2' (Pipe Z) by default, but I may be lucky
lplc: looks like that by default on max96724 each pipe can select all stream id VIDEO_PIPE_EN (0xF4) bit 4 | [14:20] | |
| kbingham | Oh - just ship the CSI2 analyser to me. I'll look after it indefinitely... it's no bother. | [14:34] | |
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| ndufresne | hverkuil: hello, had a note in my todo that you ask to add visl in https://git.linuxtv.org/v4l-utils.git/tree/contrib/test/test-media . Considering this is a wrapper on top of v4l2-ctl and we have no plan to implement stateless codecs in there, I'd like to drop this task. SebastianCollabora and I will pick it up anyway later in some form when we
have the FDO infra ready. We already have that running in GStreamer CI https://gitlab.freedesktop.org/seungha.yang/gstreamer/-/jobs/53770557 | [22:12] | |
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