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

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Message-ID: <20190517072738.deohh5fly4jxms7k@flea>
Date:   Fri, 17 May 2019 09:27:38 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Torsten Duwe <duwe@....de>
Cc:     Vasily Khoruzhick <anarsoul@...il.com>,
        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>,
        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 06:48:59PM +0200, 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.

The bootloader can deal with it, but the kernel will also need to. The
bootloader might not be doing this because it's not been updated, the
regulator might have been disabled between the time the kernel was
started and the time the bridge driver probes, etc.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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