linux-kernel - Re: [PATCH] omapfb: In omapfb_probe return -EPROBE_DEFER when display driver is not loaded yet

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Message-ID: <20130713182733.GA25019@amd.pavel.ucw.cz>
Date:	Sat, 13 Jul 2013 20:27:34 +0200
From:	Pavel Machek <pavel@....cz>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Tomi Valkeinen <tomi.valkeinen@...com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	linux-omap@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] omapfb: In omapfb_probe return -EPROBE_DEFER when
 display driver is not loaded yet

On Wed 2013-07-10 15:08:59, Pali Rohár wrote:
> * On RX-51 probing for acx565akm driver is later then for omapfb which cause that omapfb probe fail and framebuffer is not working
> * EPROBE_DEFER causing that kernel try to probe for omapfb later again which fixing this problem
> 
> * Without this patch display on Nokia RX-51 (N900) phone not working
> 
> Signed-off-by: Pali Rohár <pali.rohar@...il.com>

Tested-by: Pavel Machek <pavel@....cz>

(Actually, do we know which commit broke the ordering? We may want to
simply revert that one...)

BTW I'm currently trying to set-up automated scripts for n900/qemu
testing. I guess I'll try to run them on mainline kernel to catch such
stuff earlier.

One thing I'd like to know: how do you configure kernel to get output
on qemu? I was doing CONFIG_DEBUG_LL with specific uart, but that
needed patching the kernel, you apparently have something more clever.

I tried doing:

# CONFIG_DEBUG_LL is not set
CONFIG_DEBUG_LL_INCLUDE="mach/debug-macro.S"
CONFIG_UNCOMPRESS_INCLUDE="debug/uncompress.h"

but no output on console...

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