#linux-sunxi on 2018-10-28 — 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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03:16 <wens> it's up to individual drivers

03:16 <wens> hence the suspend/resume hooks for drivers

03:16 <wens> which most of our drivers don't implement

03:17 <wens> anarsoul: mostly because there was no suspend support at the platform level, there was no way to test if the PM functions worked properly

03:19 <anarsoul> wens: I see

03:19 <anarsoul> wens: thanks for explanation

03:21 <smaeul> printf core > /sys/power/pm_test; printf mem > /sys/power/state

03:21 <smaeul> doesn't require any platform suspend support

03:22 <smaeul> or `printf devices > /sys/power/pm_test` to avoid even the cpu hotplug. (https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt)

03:27 <MoeIcenowy> wens: s2idle will also suspend peripherals

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05:16 <anarsoul> wens: mripard: I don't see any commits from https://git.kernel.org/pub/scm/linux/kernel/git/sunxi/linux.git/log/?h=sunxi/dt64-for-4.20 in Linus' tree. Are they getting there for 4.20?

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06:22 <anarsoul> MoeIcenowy: have you looked into how to force dithering?

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06:49 <wens> anarsoul: arm-soc hasn't sent their PR

06:50 <wens> likely because all maintainers were at ELCE last week

06:50 <anarsoul> I see

06:50 <anarsoul> hope they don't miss merge window

06:50 <wens> IIRC this is only the first week, right?

06:51 <anarsoul> yeah

06:51 <wens> neither has clk nor drm sent their PRs

06:55 <anarsoul> wens: any idea what would be the best way to force dithering? I'm thinking about another dt property

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07:34 <wens> "force"?

07:44 <wens> whether a panel needs dithering should be considered based on its own color depth, and the connecting bus

07:44 <wens> why would you need to force it?

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10:29 <MoeIcenowy> wens: sometimes when a bridge is in used

10:29 <MoeIcenowy> the bridge may be connected via 6bit, or 8bit

10:29 <MoeIcenowy> on A64 it's 6bit

10:29 <MoeIcenowy> but the bridge chip is capable of 8bit

10:32 <MoeIcenowy> and on 1080p pb the panel is also capable of 8bit

10:32 <MoeIcenowy> we should have a way to tell the os that it's really 6bit

10:32 <MoeIcenowy> in fact on this case it can be in TCON driver as the RGB intf of A64 is only 6bit

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13:34 <wens> if the panel only does 6 bits, that's already covered

13:34 <wens> if the interconnecting bus to the panel is only 6 bits, that is also covered I believe

13:35 <wens> might have to check that

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18:03 <anarsoul> wens: I don't think that interconnecting bus is covered

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18:12 <anarsoul> wens: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/drm/sun4i/sun4i_tcon.c#n494

18:12 <anarsoul> tcon->panel is NULL if bridge is connected to rgb

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18:23 <anarsoul> wens: and anyway, bridge->connector is DRM_MODE_CONNECTOR_eDP

18:24 <anarsoul> it's bridge output if I understand correctly, and I don't think that we can check bridge input bpc

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