Subject: Re: [PATCH 02/15] ARM: OMAP: Correct interrupt type for ARM TWD
To: Tony Lindgren <tony@atomide.com>
References: <1458224359-32665-1-git-send-email-jonathanh@nvidia.com>
 <1458224359-32665-3-git-send-email-jonathanh@nvidia.com>
 <56EC2191.2060800@ti.com>
CC: Grygorii Strashko <grygorii.strashko@ti.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        =?UTF-8?Q?Beno=c3=aet_Cousson?= <bcousson@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        "Stephen Warren" <swarren@wwwdotorg.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Kevin Hilman <khilman@kernel.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Linus Walleij <linus.walleij@linaro.org>,
        <linux-tegra@vger.kernel.org>, <linux-omap@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
From: Jon Hunter <jonathanh@nvidia.com>
Message-ID: <56FA8AEA.3000208@nvidia.com>
Date: Tue, 29 Mar 2016 15:02:18 +0100
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Hi Tony,

On 18/03/16 15:41, Grygorii Strashko wrote:
> On 03/17/2016 04:19 PM, Jon Hunter wrote:
>> The ARM TWD interrupt is a private peripheral interrupt (PPI) and per
>> the ARM GIC documentation, whether the type for PPIs can be set is
>> IMPLEMENTATION DEFINED. For OMAP4 devices the PPI type cannot be set and
>> so when we attempt to set the type for the ARM TWD interrupt it fails.
>> This has done unnoticed because it fails silently and because we cannot
>> re-configure the type it has had no impact. Nevertheless fix the type
>> for the TWD interrupt so that it matches the hardware configuration.
>>
>> Reported-by: Grygorii Strashko <grygorii.strashko@ti.com>
>> Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
>>
>> ---
>>
>> Tony, Grygorii,
>> Please note that I have not tested this. Can you test this series and
>> see if you see any warnings on OMAP4? I am guessing that the configuration
>> should be LEVEL and not EDGE. This was reported here:
> 
> Tested-by: Grygorii Strashko <grygorii.strashko@ti.com>
> 
> Tested on PandaBoard. Without this patch I can see below warning:

I think that you can pick up this fix independently of this series as it
is something that has been broken for sometime and should be fixed. I
included it here for completeness to highlight the issue but if you want
to take it now, please go ahead.

Cheers
Jon