From: Andres Salomon <dilinger@queued.net>
To: martin-eric.racine@iki.fi
Cc: Jens Rottmann <JRottmann@lippertembedded.de>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, linux-geode@lists.infradead.org
Subject: Re: IRQF_TIMER | IRQF_SHARED ?
Date: Mon, 12 Dec 2011 14:06:56 -0800 [thread overview]
Message-ID: <20111212140656.4c5e396f@queued.net> (raw)
In-Reply-To: <CAPZXPQdOrFPVR5rQzg1+ZxhU-p9SotHNft85okunB0YmUFA2Xg@mail.gmail.com>
On Mon, 12 Dec 2011 23:00:01 +0200
Martin-Éric Racine <martin-eric.racine@iki.fi> wrote:
> 12. joulukuuta 2011 22.31 Andres Salomon <dilinger@queued.net>
> kirjoitti:
> > On Mon, 12 Dec 2011 16:41:25 +0100
> > Jens Rottmann <JRottmann@LiPPERTEmbedded.de> wrote:
> >> one of our customers tripped over the fact that the MFGPT driver
> >> won't share its IRQ with anyone else. (MFGPT defaulted to same IRQ
> >> as audio, MFGPT driver loaded first, audio fails.) *No big deal!*
> >> They don't actually need MFGPT and will simply disable it. It just
> >> made me wonder ...
> >>
> >> Why would it be such a bad idea to use IRQF_TIMER | IRQF_SHARED
> >> (see patch below)? mfgpt_tick() already does properly return
> >> IRQ_NONE when it feels unresponsible. I tested it with either
> >> driver loaded first and it seemed to work (well, at least audio
> >> worked, don't know how to explicitly test cs5535-clockevt).
> >
> > Just loading cs5535-clockevt should start the periodic timer. On my
> > XO-1, IRQ 7 starts firing immediately.
>
> Could it be a good idea to inform udev maintainers of this?
>
It *would* be nice to get it auto-loading..
next prev parent reply other threads:[~2011-12-12 22:06 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-12 15:41 IRQF_TIMER | IRQF_SHARED ? Jens Rottmann
2011-12-12 20:31 ` Andres Salomon
2011-12-12 21:00 ` Martin-Éric Racine
2011-12-12 22:06 ` Andres Salomon [this message]
2011-12-12 23:38 ` Thomas Gleixner
2011-12-13 15:49 ` Jens Rottmann
2011-12-14 18:37 ` Jens Rottmann
2011-12-14 18:47 ` Andres Salomon
2011-12-21 15:42 ` [PATCH] cs5535-clockevt: don't ignore MFGPT on SMP-capable kernels Jens Rottmann
2012-01-11 10:10 ` Andres Salomon
2012-01-19 12:57 ` Jens Rottmann
2012-01-23 10:44 ` Andres Salomon
2011-12-21 16:37 ` IRQF_TIMER | IRQF_SHARED ? Jens Rottmann
2011-12-22 16:35 ` [PATCH] cs5535-clockevt: allow the MFGPT IRQ to be shared Jens Rottmann
2012-01-11 10:15 ` Andres Salomon
2012-01-30 13:51 ` [PATCH] cs5535-clockevt: don't ignore MFGPT on SMP-capable kernels Jens Rottmann
2012-01-30 13:59 ` [PATCH] cs5535-clockevt: allow the MFGPT IRQ to be shared Jens Rottmann
2012-02-06 8:20 ` [PATCH resend] cs5535-clockevt: don't ignore MFGPT on SMP-capable kernels Jens Rottmann
2012-02-06 8:23 ` [PATCH resend] cs5535-clockevt: allow the MFGPT IRQ to be shared Jens Rottmann
2011-12-19 14:32 ` "clockevents: Set noop handler in clockevents_exchange_device()" causes hang with cs5535-clockevt Jens Rottmann
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