linux-kernel - Re: [PATCH v4 00/11] drm: add support for Atmel HLCDC Display Controller

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Message-ID: <20140821103706.2349915d@bbrezillon>
Date:	Thu, 21 Aug 2014 10:37:06 +0200
From:	Boris BREZILLON <boris.brezillon@...e-electrons.com>
To:	Ludovic Desroches <ludovic.desroches@...el.com>,
	Thierry Reding <thierry.reding@...il.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Andrew Victor <linux@...im.org.za>,
	David Airlie <airlied@...ux.ie>,
	<dri-devel@...ts.freedesktop.org>, <linux-pwm@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Clark <robdclark@...il.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	<linux-kernel@...r.kernel.org>, Rob Herring <robh+dt@...nel.org>,
	Bo Shen <voice.shen@...el.com>,
	Kumar Gala <galak@...eaurora.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 00/11] drm: add support for Atmel HLCDC Display
 Controller

Hi Ludovic,

On Thu, 21 Aug 2014 10:16:19 +0200
Ludovic Desroches <ludovic.desroches@...el.com> wrote:

> Hi Boris,
> 
> You can add
> 
> Tested-by: Ludovic Desroches <ludovic.desroches@...el.com>

Thanks for testing this driver.

> 
> Only one issue but not related to your patches, you can't display
> quickly the bootup logo since the panel detection takes too much
> time.

Yes, actually this is related to the device probe order: the
hlcdc-display-controller device is probed before the simple-panel, thus
nothing is detected on the RGB connector (I use of_drm_find_panel to
check for panel availability) when the display controller is
instantiated. I rely on the default polling infrastructure provided by
the DRM/KMS framework which polls for a new connector every 10s, and
this is far more than you kernel boot time.

Do anyone see a solution to reduce this delay (without changing the
polling interval). I thought we could add a notifier infrastructure to
the DRM panel framework, but I'm not sure this is how you want things
done...

Best Regards,

Boris

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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