From mboxrd@z Thu Jan  1 00:00:00 1970
From: Maxime Ripard <maxime.ripard@bootlin.com>
Subject: Re: [PATCH 4/4] arm64: DTS: allwinner: a64: enable ANX6345 bridge on
 Teres-I
Date: Fri, 17 May 2019 09:27:38 +0200
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To: Torsten Duwe <duwe@lst.de>
Cc: Mark Rutland <mark.rutland@arm.com>, devicetree <devicetree@vger.kernel.org>, David Airlie <airlied@linux.ie>, linux-kernel <linux-kernel@vger.kernel.org>, dri-devel <dri-devel@lists.freedesktop.org>, Vasily Khoruzhick <anarsoul@gmail.com>, Chen-Yu Tsai <wens@csie.org>, Rob Herring <robh+dt@kernel.org>, Thierry Reding <thierry.reding@gmail.com>, Laurent Pinchart <Laurent.pinchart@ideasonboard.com>, Harald Geyer <harald@ccbib.org>, Sean Paul <seanpaul@chromium.org>, arm-linux <linux-arm-kernel@lists.infradead.org>, Icenowy Zheng <icenowy@aosc.io>
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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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