linux-kernel - Re: [PATCH 4/9] drm/panel: simple: add support for overriding the pixel clock polarity

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Message-ID: <20171017085112.7bfb0b01@karo-electronics.de>
Date:   Tue, 17 Oct 2017 08:51:12 +0200
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] drm/panel: simple: add support for overriding the
 pixel clock polarity

Hi,

On Mon, 16 Oct 2017 17:13:29 -0500 Rob Herring wrote:
> On Wed, Oct 11, 2017 at 6:23 AM, Lothar Waßmann <LW@...o-electronics.de> wrote:
> > The Ka-Ro electronics MB7 baseboard has an on-board LCD->LVDS
> > converter that requires a fixed pixelclk polarity, no matter what the
> > panel's display_mode specifies. Add an option to override the pixelclk
> > polarity defined in the panel's display_mode via DTB.
> 
> Wouldn't you know the polarity required based on the type of LVDS
> converter chip in front of the panel? Or is that not being described
> because it is "transparent".
> 
Exactly the latter.


Lothar Waßmann