From mboxrd@z Thu Jan  1 00:00:00 1970
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Subject: Re: [PATCH 07/12] drm: drm_display_mode: add signal polarity flags
Date: Tue, 18 Mar 2014 09:30:35 +0000
Message-ID: <20140318093035.GR21483@n2100.arm.linux.org.uk>
References: <1394731053-6118-1-git-send-email-denis@eukrea.com>
 <2166863.3Fn4k2rvaz@avalon> <20140317161436.06169b33@ipc1.ka-ro>
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To: Lothar =?iso-8859-1?Q?Wa=DFmann?= <LW@KARO-electronics.de>
Cc: devel@driverdev.osuosl.org, Eric =?iso-8859-1?Q?B=E9nard?= <eric@eukrea.com>, Denis Carikli <denis@eukrea.com>, David Airlie <airlied@linux.ie>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, Andrzej Hajda <a.hajda@samsung.com>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, Philipp Zabel <p.zabel@pengutronix.de>, Shawn Guo <shawn.guo@linaro.org>, Sascha Hauer <kernel@pengutronix.de>, linux-arm-kernel@lists.infradead.org, Mauro Carvalho Chehab <m.chehab@samsung.com>
List-Id: dri-devel@lists.freedesktop.org

On Tue, Mar 18, 2014 at 08:50:30AM +0100, Lothar Wa=DFmann wrote:
> Hi,
> =

> Laurent Pinchart wrote:
> > Hi Lothar,
> > =

> > On Monday 17 March 2014 16:14:36 Lothar Wa=DFmann wrote:
> > > DE is not a clock signal, but an 'Enable' signal whose value (high or
> > > low) defines the window in which the pixel data is valid.
> > > The flag defines whether data is valid during the HIGH or LOW period =
of
> > > DE.
> > =

> > The DRM_MODE_FLAG_POL_DE_(LOW|HIGH) do, by my impression of the propose=
d new =

> > DRM_MODE_FLAG_POL_DE_*EDGE flags is that they define sampling clock edg=
es, not =

> > active levels.
> > =

> The current naming of the flags gives the impression that they describe
> the sampling edges of a clock signal. But the DE signal in fact is not
> a clock signal but a level sensitive gating signal.

+1

-- =

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