#linux-sunxi on 2017-06-28 — irc logs at freenode.irclog.whitequark.org

2015-02-18 19:37 Turl 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

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09:28 <diego_r> Hi oliv3r. I've seen some of your patches are being overlooked, for example: https://patchwork.ozlabs.org/patch/761510/ . Is it just a matter of being patient or is better to remind the U-Boot maintainers about them?

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09:55 <diego_r> Any meta-sunxi maintainer in here? Can a 'pyro' branch be created?

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10:09 <montjoie> meta-sunxi ?

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10:13 <diego_r> montjoie: https://github.com/linux-sunxi/meta-sunxi

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11:22 <igraltist> hi

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11:29 <igraltist> on my arm box i have the gcc6.3 and binutils-2.28, when i try to update now my glibc i get: https://paste.debian.net/973683/

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11:30 <igraltist> its more general arm question

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13:32 <rellla> i'd like to test myself in writing a kernel driver :) would this https://lkml.org/lkml/2017/6/26/431 be a similar case, that can be adapted to our G2D on A10/20? using the v4l2 api?

13:35 <wens> likely, yeah

13:36 <rellla> wens: it's maybe not worth it at all, but it seems, it's a good training project...

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14:12 <mripard> rellla: I wonder whether DRM would be a better fit though

14:12 <mripard> if it's sole purpose is for display, DRM is probably a better fit.

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14:27 <rellla> mripard: i think, it's not solely for display purposes. you can use it as a m2m device to copy, rotate, color-convert anything. independent on displaying.

14:28 <rellla> e.g. compose a GUI/OSD with alpha blendung rgba stuff and maybe then display it when finished.

14:29 <MoeIcenowy> and as I know Samsung G2D is V4L2

14:29 <rellla> ... but i'm no expert in the different APIs

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14:38 <mripard> exynos' g2d is supported in DRM

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14:40 <rellla> we have https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/media/platform/s5p-g2d

14:41 <rellla> and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/exynos

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14:41 <mripard> and https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/exynos/exynos_drm_g2d.c

14:42 <mripard> the one that seems to have the most recent activity is the drm one

14:42 <mripard> which also supports newer revision

14:43 <mripard> so it looks like they abandonned the v4l version for some reason

14:44 <mripard> probably because you just need one API for DRM, and two for v4l, so DRM is simpler

14:44 <mripard> but that's just a guess

14:45 <rellla> mripard: does drm always end in displaying something, or can one do m2m operations?

14:46 <rellla> dumb question probably :)

14:48 <mripard> rellla: usually that's meant for display

14:48 <mripard> so there's some kind of expectation that you output it to a screen

14:48 <mripard> but writeback support has been merged recently

14:48 <mripard> where the "screen" is basically a memory buffer.

14:48 <mripard> but that's after the composition

14:49 <mripard> a good idea would be to ask samsung why they changed their mind

14:50 <rellla> ...and to wait for the comments on rockchip's patches

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17:48 <plaes> mripard: any hints on how to "trigger" the ccu_div_set_rate function?

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