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

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Date:   Tue, 17 Oct 2017 14:25:07 +0200
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] drm/panel: simple: add support for overriding the
 pixel clock polarity

Hi,

On Tue, 17 Oct 2017 14:14:22 +0200 Thierry Reding wrote:
> On Wed, Oct 11, 2017 at 01:23:36PM +0200, Lothar Waßmann 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.
> 
> I'd argue that the LCD->LVDS converter should be modelled specifically
> in DT to handle this case. It could be a implemented as a DRM bridge
> driver, for example.
> 
IMO that's just overkill for a simple chip that is in no way
configurable nor detectable by software.


Lothar Waßmann