linux-kernel - Re: [PATCH] spi: omap2-mcspi: add runtime PM to set

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Message-ID: <55E31701.7050807@bitmer.com>
Date:	Sun, 30 Aug 2015 17:45:21 +0300
From:	Jarkko Nikula <jarkko.nikula@...mer.com>
To:	Mark Brown <broonie@...nel.org>, Sebastian Reichel <sre@...nel.org>
CC:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, Michael Welling <mwelling@...e.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH] spi: omap2-mcspi: add runtime PM to set_cs()

Hi

On 07/24/2015 07:39 PM, Mark Brown wrote:
> On Wed, Jul 22, 2015 at 08:46:09PM +0200, Sebastian Reichel wrote:
>> Since commit ddcad7e9068eb omap2_mcspi_set_cs() is called without
>> runtime power management requested. Thus the below kernel oops may be
>> generated if a device is accessed after the runtime power management
>> timeout. This patch fixes the problem by requesting runtime power
>> management in omap2_mcspi_set_cs().
>>
>> [   13.933959] Unhandled fault: external abort on non-linefetch (0x1028) at 0xfa09802c
>> [   13.940490] pgd = cfb38000
>> [   13.946594] [fa09802c] *pgd=48011452(bad)
>> [   13.952758] Internal error: : 1028 [#1] PREEMPT ARM
>> [   13.958862] Modules linked in: tsc2005(+) omap_sham twl4030_wdt omap_wdt
>> [   13.965332] CPU: 0 PID: 183 Comm: modprobe Not tainted 4.2.0-rc1+ #363
>> [   13.971801] Hardware name: Nokia RX-51 board
>> [   13.978302] task: cf572300 ti: cb1f2000 task.ti: cb1f2000
>> [   13.984924] PC is at omap2_mcspi_set_cs+0x44/0x4c
>> [   13.991485] LR is at spi_set_cs+0x5c/0x60
> 
> Please don't paste entire backtraces into commit messages, they are very
> large and almost entirely noise (for example in this case the entire
> explanation is in the commit message itself).  If you feel a backtrace
> helps clarify things then please present an *edited* highlight of the
> relevant sections.
> present
> 
Is there update to this patch? I don't see such in 4.2.0-rc8+. I hit
this same issue on Nokia N900 WLAN (CONFIG_WL1251=m and
CONFIG_WL1251_SPI=m) and googling lead to this patch which made the WLAN
working.

If you are going to resend this, please feel free to add my tested by:

Tested-by: Jarkko Nikula <jarkko.nikula@...mer.com>
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