linux-kernel - Re: [PATCH] ARM: omap4: gpio: fix setting IRQWAKEN bits

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Date:	Mon, 06 Jun 2011 16:25:02 -0700
From:	Kevin Hilman <khilman@...com>
To:	Todd Poynor <toddpoynor@...gle.com>
Cc:	l-o <linux-omap@...r.kernel.org>, Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel\@lists.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Colin Cross <ccross@...roid.com>
Subject: Re: [PATCH] ARM: omap4: gpio: fix setting IRQWAKEN bits

Todd Poynor <toddpoynor@...gle.com> writes:

> On Mon, Jun 06, 2011 at 03:32:29PM -0700, Kevin Hilman wrote:
>> Colin Cross <ccross@...roid.com> writes:
>> 
>> > On Sat, Jun 4, 2011 at 12:03 PM, Colin Cross <ccross@...roid.com> wrote:
>> >> Setting the IRQWAKEN bit was overwriting previous IRQWAKEN bits,
>> >> causing only the last bit set to take effect, resulting in lost
>> >> wakeups when the GPIO controller is in idle.
>> >>
>> >> Replace direct writes to IRQWAKEN with writes to SETWKUENA and
>> >> CLEARWKUEN.
>> >>
>> >> Signed-off-by: Colin Cross <ccross@...roid.com>
>> 
>> [...]
>> 
>> >
>> > Todd pointed out that the OMAP4 TRM says not to use SETWKUENA and
>> > CLEARWKUENA.  
>> 
>> In my GPIO cleanups, I was wondering why the set/clear registers were
>> not used here. Todd, can you give the TRM version & reference for this?
>> I didn't find anything after a quick scan/search.
>
> http://focus.ti.com/general/docs/wtbu/wtbudocumentcenter.tsp?templateId=6123&navigationId=12037
>
> OMAP4460 Multimedia Device Silicon Revision 1.0 Version E
> February 2011–Revised May 2011
>
> p. 5357 Table 25-68. GPIO_CLEARWKUPENA
>
> "Caution: This register is kept for backward software compatibility. Use
> GPIO_IRQWAKEN_0 and GPIO_IRQWAKEN_1 instead."

OK, I see it now.

Thanks,

Kevin

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