#linux-sunxi on 2020-01-24 — irc logs at freenode.irclog.whitequark.org

2018-08-03 10:18 rellla changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi - *only registered users can talk*

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05:24 <megi> jernej: got my app ready and it works, but I've found out that the alignment is an issue after all (especially on the input side, because I don't control what alignment sun6i-csi chooses to spit out, and it packs the YUYV output tightly)

05:25 <megi> but it's fixable

05:25 <megi> all that needs to be done is to patch sun6i-csi to respect the alignment requirements of the rotation engin

05:25 <megi> e

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06:07 <wens> v4l2 looks at things from the system's PoV lol

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06:16 <megi> well the trouble is that when you pass planar format without mplane, it's not possible to pass around all these weird alognment details

06:16 <megi> alignment

06:17 <megi> because they are per-plane, and you only have one bytesperplane in the v4l2_pix_format

06:17 <megi> such mess :)

06:18 <megi> I can pass my own bytesperplane to sun6i-csi in set_fmt, and make the driver respect it

06:18 <megi> hopefully hw will respect it too, hehe

06:19 <megi> at least for yuyv and friends where there's just a single plane

06:20 <megi> so that bytesperline will be unambiguous

06:20 <megi> s/bytesperplane/bytesperline/

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06:45 <jernej> meaning of bytesperplane is well defined here: https://elixir.bootlin.com/linux/v5.5-rc7/source/Documentation/media/uapi/v4l/pixfmt-v4l2.rst#L64

06:46 <jernej> so userspace may request specific bytesperplane, but driver is free to ignore it

06:47 <jernej> however, in systems where some HW cores needs alignment and some don't, it would be nice to consider userspace request

06:50 <jernej> regarding planar formats in one buffer:

06:50 <jernej> "

06:50 <jernej> When the image format is planar the ``bytesperline`` value applies

06:50 <jernej> to the first plane and is divided by the same factor as the

06:50 <jernej> ``width`` field for the other planes.

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09:28 <fALSO> bom dia

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11:02 <willmore> I wonder if the writing to tmpfs was slow because zram may have been turned on?

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11:16 <megi> jernej: ah, so that's why rotation driver has 32B alignemnent for the first plane in case o YUV420, it's kernel abi

11:17 <megi> thanks for pointing me to docs

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11:49 <megi> ha! got it

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12:00 <megi> willmore: maybe, I don't have zswap enabled but if having zram enabled in the kernel makes tmpfs use it, it might be it

12:00 <megi> interesting guess

12:11 <KotCzarny> still, too big cpu usage

12:11 <KotCzarny> unless compressed

12:15 <megi> https://www.youtube.com/watch?v=8u5kMiv_45w

12:16 <megi> I need 3 hands

12:16 <megi> jernej, thanks again :)

12:17 <megi> now to add some AR ;)

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19:41 <jernej> megi: what rotation settings you are using in the yt video?

19:41 <megi> rotate=90

19:41 <megi> 720p YUYV input

19:42 <megi> I guess that defines it completely. Why? :)

19:43 <jernej> I can't tell from the video :)

19:43 <megi> ah :)

19:44 <megi> I also do some plane scaling in DRM to zoom it to 1440 width

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