linux-kernel - Re: 2.6.33-rc3 regression: leds_alix2: can't allocate I/O for GPIO

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Date:	Thu, 07 Jan 2010 13:11:31 +0100
From:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>
To:	Richard Purdie <rpurdie@...ys.net>
Cc:	Arnd Hannemann <Arnd.Hannemann@...s.rwth-aachen.de>,
	Daniel Mack <daniel@...aq.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-geode@...ts.infradead.org" <linux-geode@...ts.infradead.org>
Subject: Re: 2.6.33-rc3 regression: leds_alix2: can't allocate I/O for GPIO

Arnd Hannemann schrieb:
> Richard Purdie schrieb:
>> On Thu, 2010-01-07 at 11:26 +0100, Arnd Hannemann wrote:
>>> with 2.6.33-rc3 the LEDs are not working anymore on my Geode embedded board:
>>> If I remember correctly this was working fine with 2.6.32, but certainly with 2.6.31
>>>
>>> relevant dmesg output of 2.6.33-rc3:
>>>
>>> [    0.709643] cs5535_gpio: base=0x6100 mask=0xb003c66 major=253
>>>
>>> [    2.207947] leds_alix2: system is recognized as "PC Engines ALIX.2 v0.99h"
>>> [    2.228678] leds_alix2: can't allocate I/O for GPIO
>>>
>>>
>>> For reference dmesg of 2.6.31.3:
>>>
>>> [    0.611953] cs5535_gpio: base=0x6100 mask=0xb003c66 major=253
>>>
>>> [    2.379114] leds_alix2: system is recognized as "PC Engines ALIX.2"
>>> [    2.399097] Registered led device: alix:1
>>> [    2.411404] Registered led device: alix:2
>>> [    2.423720] Registered led device: alix:3
>> Its likely to be commit 7f131cf3ed96c969d7b092bf629e25c3df50901e. It
>> looks like the request_region() call is failing. Daniel, any idea why?
> 
> Some additional debug information:
> 
> elara:~# rdmsr 0x5140000C
> f00100006100
> 
> /proc/ioports says:
> 6100-61ff : 0000:00:0f.0
>   6100-61ff : cs5535_gpio
> 
> BTW: why is request_region() needed there after all?

Oh, maybe using cs5535_gpio AND leds_alix2 together was never supposed to work?

Best regards,
Arnd
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