From: Thierry Reding <thierry.reding@gmail.com>
To: "Lothar Waßmann" <LW@KARO-electronics.de>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH 4/9] drm/panel: simple: add support for overriding the pixel clock polarity
Date: Tue, 17 Oct 2017 14:45:04 +0200 [thread overview]
Message-ID: <20171017124504.GC27983@ulmo> (raw)
In-Reply-To: <20171017142507.127f1711@karo-electronics.de>
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On Tue, Oct 17, 2017 at 02:25:07PM +0200, Lothar Waßmann wrote:
> 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.
I suspect that you're not the only one who runs a board that has this
kind of quirk. If we solve this in a generic way we can point people in
that direction when they come asking for such a quirk.
So this could be something very simple that's instantiated using maybe a
couple of lines of code.
Thierry
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next prev parent reply other threads:[~2017-10-17 12:45 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 11:23 [PATCH 0/9] drm/panel: simple: improve definition of display modes and add more panels Lothar Waßmann
2017-10-11 11:23 ` [PATCH 1/9] drm/panel: simple: add a macro for defining display modes in a simpler and less error prone way Lothar Waßmann
2017-10-17 12:08 ` Thierry Reding
2017-10-17 12:13 ` Lothar Waßmann
[not found] ` <20171017141337.088ba796-AvR2QvxeiV7DiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>
2017-10-17 12:50 ` Thierry Reding
2017-10-11 11:23 ` [PATCH 2/9] drm/panel: simple: simplify display_mode definitions by using macro Lothar Waßmann
[not found] ` <1507721021-28174-3-git-send-email-LW-bxm8fMRDkQLDiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>
2017-10-17 12:09 ` Thierry Reding
2017-10-17 13:05 ` Lothar Waßmann
2017-10-17 13:08 ` Thierry Reding
2017-10-17 13:17 ` Lothar Waßmann
2017-10-11 11:23 ` [PATCH 3/9] drm/panel: simple: make it possible to override LCD bus format Lothar Waßmann
[not found] ` <1507721021-28174-4-git-send-email-LW-bxm8fMRDkQLDiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>
2017-10-13 22:13 ` Rob Herring
2017-10-17 12:12 ` Thierry Reding
2017-10-17 12:44 ` Lothar Waßmann
[not found] ` <20171017144423.4ddd6047-AvR2QvxeiV7DiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>
2017-10-17 12:56 ` Thierry Reding
2017-10-17 17:11 ` Rob Herring
[not found] ` <1507721021-28174-1-git-send-email-LW-bxm8fMRDkQLDiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>
2017-10-11 11:23 ` [PATCH 4/9] drm/panel: simple: add support for overriding the pixel clock polarity Lothar Waßmann
2017-10-16 22:13 ` Rob Herring
[not found] ` <CAL_Jsq+EcROz1OYK28y814+Q__F=1obXe7EuXRBta+BRFjBJFA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-10-17 6:51 ` Lothar Waßmann
2017-10-17 12:14 ` Thierry Reding
2017-10-17 12:25 ` Lothar Waßmann
2017-10-17 12:45 ` Thierry Reding [this message]
2017-10-25 9:56 ` Lothar Waßmann
2017-10-11 11:23 ` [PATCH 5/9] drm/panel: simple: add support for EDT ET0350 3.5" QVGA panel Lothar Waßmann
[not found] ` <1507721021-28174-6-git-send-email-LW-bxm8fMRDkQLDiMYJYoSAnRvVK+yQ3ZXh@public.gmane.org>
2017-10-17 19:50 ` Rob Herring
2017-10-11 11:23 ` [PATCH 6/9] drm/panel: simple: add support for EDT ET0430 4.3" HVGA panel Lothar Waßmann
2017-10-11 11:23 ` [PATCH 7/9] drm/panel: simple: add support for NLT NL12880 12.1" WXGA LVDS panel Lothar Waßmann
2017-10-11 11:23 ` [PATCH 8/9] drm/panel: simple: add support for EDT ETM0700G0EDH6 7" WVGA panel Lothar Waßmann
2017-10-11 11:23 ` [PATCH 9/9] drm/panel: simple: add support for EDT ET1010G0DSA/ETML1010G0DKA 10.1" WXGA LVDS panels Lothar Waßmann
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