linux-kernel - Re: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use irq_alloc

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Date:	Tue, 03 Apr 2012 08:32:18 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andreas Schwab <schwab@...ux-m68k.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...ts.ozlabs.org, devicetree-discuss@...ts.ozlabs.org,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Milton Miller <miltonm@....com>,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: Re: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use
 irq_alloc_desc() instead

On Mon, 2012-04-02 at 23:27 +0200, Thomas Gleixner wrote:
> So it's covered by this section:
> 
> mpic_set_irq_type()
> 
>         if (flow_type == IRQ_TYPE_NONE)
>                 if (mpic->senses && src < mpic->senses_count)
>                         flow_type = mpic->senses[src];
>         if (flow_type == IRQ_TYPE_NONE)
>                 flow_type = IRQ_TYPE_LEVEL_LOW;
> 
> And with IRQ_TYPE_NONE this is always going to end up with
> IRQ_TYPE_LEVEL_LOW simply because the only function which might set
> mpic->senses is mpic_set_default_senses(). And this function does not
> have a single caller .....
> 
> /me scratches head 

Something must have broken ... when converting from the device-tree we
should be calling xlate which should extract the polarity/sense from the
device-tree.

Now, afaik, IRQ_LEVEL_LOW is correct for PCI unless the interrupt is
inverted inside Apple ASIC which is possible... (it's not an external
PCI, it's a cell inside K2).

Cheers,
Ben.


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