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Date:   Thu, 16 May 2019 18:48:59 +0200
From:   Torsten Duwe <>
To:     Vasily Khoruzhick <>
Cc:     David Airlie <>, Daniel Vetter <>,
        Rob Herring <>,
        Mark Rutland <>,
        Thierry Reding <>,
        Maxime Ripard <>,
        Chen-Yu Tsai <>,
        Andrzej Hajda <>,
        Laurent Pinchart <>,
        Icenowy Zheng <>,
        Sean Paul <>,
        Harald Geyer <>,
        dri-devel <>,
        devicetree <>,
        arm-linux <>,
        linux-kernel <>
Subject: Re: [PATCH 4/4] arm64: DTS: allwinner: a64: enable ANX6345 bridge
 on Teres-I

On Thu, May 16, 2019 at 09:06:41AM -0700, Vasily Khoruzhick wrote:
> Driver can talk to the panel over AUX channel only after t1+t3, t1 is
> up to 10ms, t3 is up to 200ms.

This is after power-on. The boot loader needs to deal with this.

> It works with older version of driver
> that keeps panel always on because it takes a while between driver
> probe and pipeline start.

No lid switch, no USB, no WiFi, no MMC. If you disable DCDC1 you'll
run out of wakeup-sources ;-) IOW: I see no practical way any OS
driver can switch this panel voltage off and survive...

> All in all - you don't need panel timings since there's EDID but you
> still need panel delays. Anyway, it's up to you and maintainers.

Let's give it a try.


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