From: Stas Sergeev <stsp@aknet.ru>
To: tglx@linutronix.de
Cc: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] make pit clocksource continuous
Date: Sun, 13 May 2007 22:17:02 +0400 [thread overview]
Message-ID: <4647561E.7090702@aknet.ru> (raw)
In-Reply-To: <1179077772.22481.279.camel@localhost.localdomain>
Hello.
Thomas Gleixner wrote:
>>>> Does this mean that on even an older
>>>> boards (without acpi at all) the hrtimers
>>>> won't work?
>>> Not if PIT is the only clocksource available.
I was confused as to where the above "not" applies.
> It does _NOT_ work without pm_timer or hpet
Thanks, now its clear enough. :)
> hrtimer_get_res() works, but I have no idea why you need hrtimers in
> your driver at all.
This is a pc-speaker PCM driver which needs a
18.5KHz periodic freq at least (the normal freq
is 37KHz).
I used the PIT and only PIT for it in the past,
but now with using hrtimers, the PIT is no
longer enough. This is a bit annoying, and
really, after I added the flag to pit_clocksource,
it just started to work, so I thought something
can be done in order for it to keep working with
PIT only. But if there is no way to do it with
hrtimers, then oh well.
prev parent reply other threads:[~2007-05-13 18:14 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-12 23:18 [patch] make pit clocksource continuous Stas Sergeev
2007-05-12 23:38 ` Daniel Walker
2007-05-13 7:16 ` Thomas Gleixner
2007-05-13 9:04 ` Stas Sergeev
2007-05-13 14:54 ` Thomas Gleixner
2007-05-13 16:48 ` Stas Sergeev
2007-05-13 16:50 ` Thomas Gleixner
2007-05-13 17:23 ` Stas Sergeev
2007-05-13 17:36 ` Thomas Gleixner
2007-05-13 17:55 ` Matthieu CASTET
2007-05-13 18:17 ` Stas Sergeev [this message]
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