linux-kernel - Re: [linux-pm] [3/6] 2.6.21-rc4: known regressions

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Date:	Wed, 28 Mar 2007 23:27:55 +0200
From:	Maxim <maximlevitsky@...il.com>
To:	David Brownell <david-b@...bell.net>
Cc:	linux-pm@...ts.linux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	linux-ide@...r.kernel.org, gregkh@...e.de, linux-pm@...ts.osdl.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...sta.de>, linux-acpi@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <jens.axboe@...cle.com>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Thomas Gleixner <tglx@...utronix.de>, jgarzik@...ox.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [3/6] 2.6.21-rc4: known regressions

On Wednesday 28 March 2007 22:59:26 David Brownell wrote:
> On Wednesday 28 March 2007 1:19 pm, Maxim wrote:
> > On Wednesday 28 March 2007 21:38:55 David Brownell wrote:
> 
> > > 
> > > Also, making HPET use the legacy mode seems like a step backwards.
> 
> > 	It is not 'legacy' mode,
> > It is a legacy replacement mode.
> 
> Typo, sorry.
> 
> 
> > It this mode HPET takes over IRQ0 and IRQ 8 and provides this way
> > replacement for PIT and RTC periodic function 
> 
> It's that RTC periodic thing that bothers me, I don't mind about
> the PIT.  Remember that IRQ8 is also used for other RTC functions.
> 
> Now, if there were a way to tell rtc-cmos that HPET is active,
> and arrange some kind of handshake ... that would be different.
> 
> - Dave
> 

Yes,
	When HPET is active it eats RTC IRQ,
	So the only way out is to emulate RTC using HPET,
	It is done this way in old rtc driver, rtc-cmos should do the same.

	Of course suspend resume is not supported at all by old rtc driver

	I already wrote complete support for suspend/resume for old rtc driver (I wrote it long time ago)

	Now I fixed it to support HPET , and this way I discovered that HPET doesn't have suspend resume functions

	I will do last checks now and send this patch very soon

	I am also planning to add support of HPET and suspend/resume for rtc-cmos, but I didn't start this yet.

	Best regards,
		Maxim Levitsky




	
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