linux-kernel - Re: [PATCH v2 2/3] drm/panel: add support for EDT panels

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Message-ID: <20140515091220.GC6434@ulmo>
Date:	Thu, 15 May 2014 11:12:21 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Stefan Agner <stefan@...er.ch>
Cc:	Philipp Zabel <p.zabel@...gutronix.de>, swarren@...dotorg.org,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, marcel@...wiler.com
Subject: Re: [PATCH v2 2/3] drm/panel: add support for EDT panels

On Thu, May 15, 2014 at 10:24:39AM +0200, Stefan Agner wrote:
> Hi Thierry, hi Philipp,
> 
> Am 2014-05-15 09:51, schrieb Thierry Reding:
> > On Wed, May 14, 2014 at 11:45:57PM +0200, stefan@...er.ch wrote:
> >> From: Stefan Agner <stefan@...er.ch>
> >>
> >> This panels are sold by Toradex for Colibri T20/T30 and Apalis T30
> >> evaluation kits.
> >>
> >> Signed-off-by: Stefan Agner <stefan@...er.ch>
> > 
> > Panel patches should go to the dri-devel mailing list as well.
> > 
> > Also a patch was posted only yesterday for a panel that seems to be the
> > exact same one as this, even though the name differs minimally, see:
> > 
> > 	https://patchwork.kernel.org/patch/4175251/
> > 
> > Adding Philipp on Cc so you guys can work together whether this is
> > indeed the same panel. The only differences seem to be in the vertical
> > front and back porches, but I suspect that either settings will work on
> > both Tegra and i.MX.
> 
> Its etm0700g0dh6 vs. et070080dh6, Philipp's panel is with captive multi
> touch, (hence the M I guess). The panel itself really looks the same.
> 
> I found this overview of EDT displays:
> http://www.dmbtechnics.com/scripts/passthru.php?id=7
> 
> There seem to be quite a lot variants with the same panel...
> 
> Regarding timings, I just checked the documentation, Philipp's timing
> really matches the documented ones, I miscalculated the vertical back
> porch.

Okay, so that means that the panel works for you with the same timings
that Philipp has in the ETM0700G0DH6 patch? If so then I definitely
think we should be sharing the timings in the driver by making the two
compatible entries point to the same driver data.

> How do we resolve that?
> 
> I would suggest that I split out that patch and remove the et070080dh6
> panel and send the other as a single patch to the dri-devel mailing list
> as well.

Yes, that would work.

> Philipp, could you add my display type (et070080dh6) to the compatible
> list of your mode/panel entry?

I also noticed that Philipp's patch doesn't actually introduce the
device tree bindings, so that will have to be added as well.

Thierry

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