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From: Ralf Baechle <ralf@linux-mips.org>
To: David VomLehn <dvomlehn@cisco.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] powertv: Fix support for timer interrupts when using >64 external IRQs
Date: Tue, 26 Jan 2010 15:26:14 +0100	[thread overview]
Message-ID: <20100126142614.GC17849@linux-mips.org> (raw)
In-Reply-To: <20091222014922.GA30164@dvomlehn-lnx2.corp.sa.net>

On Mon, Dec 21, 2009 at 05:49:22PM -0800, David VomLehn wrote:

> The MIPS processor is limited to 64 external interrupt sources. Using a
> greater number without IRQ sharing requires reading platform-specific
> registers. On such platforms, reading the IntCtl register to determine
> which interrupt corresponds to a timer interrupt will not work.
> 
> On MIPSR2 systems there is a solution--the TI bit in the Cause register,
> specifically indicates that a timer interrupt has occured. This patch
> uses that bit to detect interrupts for MIPSR2 processors, which may be
> expected to work regardless of how the timer interrupt may be routed
> in the hardware.

I think this isn't relevant for any currently in-tree supported platforms (?)
so I've queued this for 2.6.34.

Thanks,

  Ralf

  reply	other threads:[~2010-01-26 14:26 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-12-22  1:49 [PATCH] powertv: Fix support for timer interrupts when using >64 external IRQs David VomLehn
2010-01-26 14:26 ` Ralf Baechle [this message]
2010-01-26 18:36   ` David VomLehn
2010-01-26 23:20     ` Ralf Baechle
2010-01-30 15:10 ` Maxime Bizon
2010-02-01  8:47   ` Wu Zhangjin

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