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Date:   Thu, 16 May 2019 17:48:20 +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 Wed, May 15, 2019 at 08:08:57AM -0700, Vasily Khoruzhick wrote:
> On Wed, May 15, 2019 at 12:32 AM Torsten Duwe <> wrote:
> >
> > It does comply with the bindings. The ports are all optional.
> > As far as DT is concerned, the signal path ends here. This is also the
> > final component _required_ to get the Linux kernel DRI up and running.
> Ugh, then bindings should be fixed. It's not optional. It may work if
> bootloader enables power for you, but it won't if you disable display
> driver in u-boot.

I double-checked. On the Teres-I, mentioning the panel _is_ optional.
PD23 powers down panel and backlight as much as possible, see
24bd5d2cb93bc arm64: dts: allwinner: a64: teres-i: enable backlight
(currently only in Maxime's repo) and the Teres-I schematics...

And the driver in your repo neatly guards all accesses with
"if (anx6345->panel)" -- good!
But I found the Vdds are required, so I added them as such.

> I guess you're testing it with older version of anx6345. Newer version
> that supports power management [1] needs startup delay for panel.
> Another issue that you're seeing is that backlight is not disabled on
> DPMS events. All in all, you need to describe panel in dts.
> [1]

> > Should I also have added a Tested-by: ? ;-)
> I don't have Teres, so I haven't tested these.

*I* have one, and this works. I'll retest with your newer driver,
just in case. Nonetheless, the changes in this series should be fine.
Sending out v2 in a moment...


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