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Date:   Thu, 16 May 2019 11:26:45 -0700
From:   Vasily Khoruzhick <>
To:     Torsten Duwe <>
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 9:49 AM Torsten Duwe <> wrote:
> 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.

Actually panel driver has to deal with it and not bootloader.

> > 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...

Ouch, looks like someone made a huge mistake in HW design?

> > 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.
>         Torsten

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