linux-kernel - Re: 3.12-rc1: no longer compiles for Nokia n900 (omap based), display no longer works

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Message-ID: <20130926002349.GA26599@amd.pavel.ucw.cz>
Date:	Thu, 26 Sep 2013 02:23:49 +0200
From:	Pavel Machek <pavel@....cz>
To:	Aaro Koskinen <aaro.koskinen@....fi>
Cc:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, will.deacon@....com,
	catalin.marinas@....com
Subject: Re: 3.12-rc1: no longer compiles for Nokia n900 (omap based),
 display no longer works

Hi!

> On Thu, Sep 19, 2013 at 11:44:02AM +0200, Pavel Machek wrote:
> > something in 3.12-rc1 broke display :-(. (dmesg diff attached at the
> > end, maybe someone knows...)
> 
> 3.12-rc1 for N900 compiles and works (also display) here with binutils
> 2.23.2.

I updated to eldk-5.4, and now it compiles, but still no display on 

> > + omapfb omapfb: no displays
> 
> [...]
> 
> > - acx565akm spi1.2: omapfb: acx565akm rev 12 LCD detected
> 
> I think this is because the panel driver has changed, and the old one
> was deleted. You need to change your kernel configuration with something
> like below:
> 
> -CONFIG_PANEL_ACX565AKM=y
> +CONFIG_DISPLAY_PANEL_SONY_ACX565AKM=y

Thanks for the hint.. but apparently it was not enough. Still no
display on qemu :-(.

Anyway, "make oldconfig" is expected to produce working kernel, which
is clearly not case here. Perhaps this should be added to fix that?

[Who can take the patch?]
   	       	    	  	       	      	       	      Pavel

PS: whoever named directory in kernel sources "displays-new" should...
think again.

Signed-off-by: Pavel Machek <pavel@....cz>

index 6c90885..d3eabd2 100644
--- a/drivers/video/omap2/displays-new/Kconfig
+++ b/drivers/video/omap2/displays-new/Kconfig
@@ -40,6 +40,7 @@ config DISPLAY_PANEL_DSI_CM
 
 config DISPLAY_PANEL_SONY_ACX565AKM
 	tristate "ACX565AKM Panel"
+	default PANEL_ACX565AKM
 	depends on SPI && BACKLIGHT_CLASS_DEVICE
 	help
 	  This is the LCD panel used on Nokia N900

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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