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From: Vasily Khoruzhick <anarsoul@gmail.com>
To: Torsten Duwe <duwe@lst.de>
Cc: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>,
	Chen-Yu Tsai <wens@csie.org>, Andrzej Hajda <a.hajda@samsung.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Icenowy Zheng <icenowy@aosc.io>,
	Sean Paul <seanpaul@chromium.org>,
	Harald Geyer <harald@ccbib.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	devicetree <devicetree@vger.kernel.org>,
	arm-linux <linux-arm-kernel@lists.infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/4] arm64: DTS: allwinner: a64: enable ANX6345 bridge on Teres-I
Date: Thu, 16 May 2019 11:26:45 -0700	[thread overview]
Message-ID: <CA+E=qVdxvU5t9MB447Zd+-MO7rw+qBxxaZApjp4fgDx=W47r-g@mail.gmail.com> (raw)
In-Reply-To: <20190516164859.GB10431@lst.de>

On Thu, May 16, 2019 at 9:49 AM Torsten Duwe <duwe@lst.de> 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
>

  reply	other threads:[~2019-05-16 18:26 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-14 15:59 [PATCH 0/4] Add missing device nodes for Olimex Teres-I Torsten Duwe
2019-05-14 16:02 ` [PATCH 1/4] arm64: DTS: allwinner: a64: Add pinmux for RGB666 LCD Torsten Duwe
2019-05-16  8:54   ` Maxime Ripard
2019-05-14 16:02 ` [PATCH 2/4] dt-bindings: Add ANX6345 DP/eDP transmitter binding Torsten Duwe
2019-05-14 16:02 ` [PATCH 3/4] arm64: DTS: allwinner: a64: Enable audio on Teres-I Torsten Duwe
2019-05-14 16:02 ` [PATCH 4/4] arm64: DTS: allwinner: a64: enable ANX6345 bridge " Torsten Duwe
2019-05-14 17:48   ` Vasily Khoruzhick
2019-05-15  7:31     ` Torsten Duwe
2019-05-15 15:08       ` Vasily Khoruzhick
2019-05-16 15:48         ` Torsten Duwe
2019-05-16 16:06           ` Vasily Khoruzhick
2019-05-16 16:48             ` Torsten Duwe
2019-05-16 18:26               ` Vasily Khoruzhick [this message]
2019-05-17  7:27               ` Maxime Ripard
2019-05-17  8:14                 ` Torsten Duwe
2019-05-17  9:08                   ` Maxime Ripard
2019-05-17  9:47                     ` Torsten Duwe
2019-05-17 15:25                       ` Vasily Khoruzhick

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