linux-kernel - Re: [PATCH 4/4] arm64: DTS: allwinner: a64: enable ANX6345 bridge on Teres-I

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Message-ID: <20190516164859.GB10431@lst.de>
Date:   Thu, 16 May 2019 18:48:59 +0200
From:   Torsten Duwe <duwe@....de>
To:     Vasily Khoruzhick <anarsoul@...il.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Sean Paul <seanpaul@...omium.org>,
        Harald Geyer <harald@...ib.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        devicetree <devicetree@...r.kernel.org>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
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.

	Torsten