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| hverkuil | ezequielg: ping | [09:51] |
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| pinchartl | hverkuil: ping | [11:34] |
| hverkuil | pinchartl: pong | [11:35] |
| pinchartl | I had a question for you the other day, about the control framework
did you see it ? | [11:37] |
| hverkuil | No, I didn't. It probably wasn't logged either since I was doing maintenance to my server. | [11:37] |
| pinchartl | ok
so in a nutsheel nutshell I have two controls V4L2_CID_VBLANK and V4L2_CID_EXPOSURE the EXPOSURE limits depend on the VBLANK value as sensors require EXPOSURE < total height (height + VBLANK) - sensor-specific margin changing VBLANK changes the limits of EXPOSURE if I set both controls in a single VIDIOC_S_EXT_CTRLS the value of EXPOSURE gets clamped to the current limits, not the limits corresponding to the new VBLANK value is that fixable in the control framework ? | [11:38] |
| hverkuil | I now remember reading about this, I think you asked this last week (or even longer ago) as well, right?
Sorry, it's been very busy lately. | [11:40] |
| pinchartl | no worries | [11:41] |
| hverkuil | Actually, I think you can do this today already. First of all the two controls have to be in the same control cluster: they depend on one another, so they have to be validated atomically.
Secondly, you can create your own type_ops. If you don't specify type_ops, then std_type_ops (defined in v4l2-ctrls-core.c) is used, but you can supply your own. | [11:45] |
| pinchartl | ok | [11:47] |
| hverkuil | Unfortunately, it looks like the four standard ops are marked static in v4l2-ctrls-core.c, it would be really nice if that can be changed so that in your driver you can still use std_equal, std_init and std_log, and only need to supply your own validate.
But that would be a simple change, of course. | [11:47] |
| pinchartl | not very nice to implement in sensor drivers, but doable | [11:48] |
| hverkuil | Is this a one-off, or will this be true for all sensor drivers? | [11:48] |
| pinchartl | v4l2_subdev is really the wrong level of abstraction for camera sensors, there's way too much boilerplate code
it should be true for all sensor drivers | [11:48] |
| hverkuil | OK, then a standard sensor_type_ops helper might be best, you can just use that.
You may have to experiment a bit to see what works best. | [11:50] |
| pinchartl | thanks for your feedback | [11:52] |
| hverkuil | I never tried something like this before :-) | [11:52] |
| pinchartl | you should work more in userspace, it's impressive how many kernel shortcomings one can uncover :-)
the vblank control, for instance, is absolutely awful to work with most sensors have a maximum total vertical size, it's a fixed value to the maximum vblank value depends on the height of the configured format s/to/so/ | [11:56] |
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| hverkuil | Not my control :-) | [12:15] |
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| ndufresne | pinchartl: not so easy to figure-out that V4L2_PIX_FMT_NV12MT_16X16 and V4L2_PIX_FMT_HM12 are identical pixel format, but one is mplane, the other is single allocation
I clearly missed that one, why didn't you follow the existing naming, and just call it V4L2_PIX_FMT_NV12T_16X16 | [15:20] |
| ezequielg | hverkuil: ping
i mean, pong... pang, peng. sorry for the delay :) | [15:24] |
| pinchartl | ndufresne: did I add those formats ? I don't recall :-) | [15:25] |
| ezequielg | fwiw, it's never too late, uh? i think we can improve documentation a bit. | [15:25] |
| hverkuil | ezequielg: simple question: just verifying that '[PATCH v2 00/10] hantro: Enable H.264 VDPU2' is indeed superseding '[PATCH 00/12] hantro: Enable H.264 VDPU2 (Odroid Advance Go)'? | [15:26] |
| ezequielg | yes.
sorry, forgot to mark as superseeding. | [15:26] |
| hverkuil | OK, thanks. Marked as such in patchwork.
I need to start doing patch reviews again now that rc1 is merged... | [15:27] |
| ezequielg | speaking of Hantro, as I'm typing I'm testing Andrzej's VP9 Hantro G2. So looks like we may land VP9 veeery soon. | [15:27] |
| hverkuil | nice | [15:28] |
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| ndufresne | pinchartl: ah, I see, you simply moved it, who added that then ...
it predates 2012, when the entire uapi got reworked massively ezequielg: funny, doc for cx2341x explains the format, HM stands for Hauppauge Macroblock, a miss-nommer for 'Conexant Macroblock' and these card have MPEG2 decoders, something H264 decoders in it | [18:00] |
| ezequielg | who knows if it's all the same layout.
it's even more funny than a sunxi driver declares that form. | [18:04] |
| ndufresne | who knows if it's the same codec lol | [18:04] |
| ezequielg | *pixelformat
:P | [18:04] |
| ndufresne | but 16x16 was also supported by TI magical rotator
it still magical to me, it suppose to do zero-copy 90deg rotation with some memory bus feature iirc | [18:05] |
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| jernej | ezequielg: VP9 hantro G2? that's very good to hear
ping me for porting on Allwinner H6 | [19:31] |
| ezequielg | jernej: ping.
:) please start porting? :) ezequielg runs | [19:33] |
| jernej | uh, I'm not following ML lately
it's there already? currently I'm hacking SDIO support for wifi drivers, so... next week? | [19:34] |
| ezequielg | when you say Allwinner H6, I bet it's some cedrus variant? | [19:35] |
| jernej | no, H6 has secondary VPU, just for VP9
and it's stripped down G2 variant so in theory only H6 specifics need to be added, like clocks and reset lines | [19:37] |
| ezequielg | oh la la!
are there any specs to read? with info about the VPU I mean | [19:39] |
| jernej | nope
I dumped few cfg regs it may also support hevc, but vendor code is using it strictly for vp9 | [19:42] |
| ezequielg | super good.
my colleague Andrzej is driving all the effort, together with ndufresne and dwlsalmeida on the gstreamer side. We had the rkvdec (the old variant) working and we wanted to have hantro g2 as well, so the vp9 controls got wider adoption. The driver is working well, and looks fairly clean. Adding some quirks to support a stripped down version would be great. i'm all for gaining more users. | [19:48] |
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| jernej | sure :)
is code already public? | [20:07] |
| ezequielg | no, but it's about to be. | [20:08] |
| jernej | that's why I said ping me :) | [20:10] |
| ezequielg | we'll Cc you. | [20:14] |
| jernej | thanks! | [20:16] |
| ndufresne | jernej: perhaps considering giving ezequielg your working email, I notice you have an email addr that bounce these days | [20:29] |
| jernej | ndufresne: it was fixed in drm-misc a long time now
I thought it already propagated to stable I even added alias to .mailmap | [20:30] |
| ezequielg | I'll track that emil and use it
I add mails manually, sorry about that. | [20:31] |
| jernej | it's in stable already: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/.mailmap?h=v5.13.1#n163 | [20:32] |
| ndufresne | ++ | [20:33] |
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| ezequielg | I was under the impression that only applied to some script and tools, such as get_maintainer. Sometimes you want to Cc specific people. In those cases, I got to git-log and use whatever latest mail I see there. | [20:43] |
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| djrscally | Quick question; does it make sense to have a sensor configured with a horizontal timing size that's lower than the output width? | [23:02] |
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