linux-kernel - Re: [PATCH 00/23] Nokia N950 display support

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Date:	Wed, 9 Mar 2016 15:33:00 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Tony Lindgren <tony@...mide.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	David Airlie <airlied@...ux.ie>, linux-omap@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/23] Nokia N950 display support

Hi,

On Wed, Mar 09, 2016 at 09:10:28AM +0200, Tomi Valkeinen wrote:
> Hmm there's only so called DMA rotation, which shouldn't work. It's only
> meant for really small displays, when the framebuffer is in SRAM. So I'm
> a bit baffled as to what rotation you are using and why is it working =).
>
> There is also VRFB rotation on omap3, but that's not supported by omapdrm.

yeah, I was also wondering why it's working. I just did "xrandr -o
left" and my display was rotated unexpectedly :) I have not yet
checked what happens in that case.

> > But yeah, we probably want to change the default
> > rotation. Especially since touchscreen should have
> > the same default rotation as the screen. (TS is
> > horizontal, correct orientation for keyboard usage)
> 
> I don't know much about touchscreens, but I'm guessing that it's easier
> to rotate the coordinates from touch than achieve good panel rotation on
> N950.

Yes, rotating the TS coordinates is simpler than panel rotation,
since much less information must be rotated. I just mentioned
TS, since the _default_ orientation should be the same for both.
In the end both must be rotated at the same time (and thus both
must support rotation).

-- Sebastian

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