From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [PATCH] x86/HPET: don't disable interrupt delivery
 right after setting it up
Date: Thu, 27 Sep 2012 16:28:15 +0100
Message-ID: <CC8A2F1F.400C1%keir.xen@gmail.com>
References: <50648161020000780009E418@nat28.tlf.novell.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <50648161020000780009E418@nat28.tlf.novell.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

On 27/09/2012 15:40, "Jan Beulich" <JBeulich@suse.com> wrote:

> We shouldn't clear HPET_TN_FSB right after we (indirectly, via
> request_irq()) enabled it for the channels we intend to use for
> broadcasts.
> 
> This fixes a regression introduced by c/s 25103:0b0e42dc4f0a.
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Keir Fraser <keir@xen.org>

> ---
> This fixes the MWAIT idle driver problem on the box that I was able to
> (artificially) reproduce it with. Hence I subsequently intend to revert
> 25960:6bf8b882df8f, but I'm not intending to do this before getting a
> push there.
> 
> I'm surprised that this didn't hit anyone so far with the ACPI-based
> idle driver...
> 
> --- 2012-09-21.orig/xen/arch/x86/hpet.c 2012-09-27 16:10:35.000000000 +0200
> +++ 2012-09-21/xen/arch/x86/hpet.c 2012-09-27 16:10:07.000000000 +0200
> @@ -533,7 +533,7 @@ void __init hpet_broadcast_init(void)
>      {
>          /* set HPET Tn as oneshot */
>          cfg = hpet_read32(HPET_Tn_CFG(hpet_events[i].idx));
> -        cfg &= ~(HPET_TN_LEVEL | HPET_TN_PERIODIC | HPET_TN_FSB);
> +        cfg &= ~(HPET_TN_LEVEL | HPET_TN_PERIODIC);
>          cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
>          hpet_write32(cfg, HPET_Tn_CFG(hpet_events[i].idx));
>  
> @@ -590,7 +590,7 @@ void hpet_broadcast_resume(void)
>  
>          /* set HPET Tn as oneshot */
>          cfg = hpet_read32(HPET_Tn_CFG(hpet_events[i].idx));
> -        cfg &= ~(HPET_TN_LEVEL | HPET_TN_PERIODIC | HPET_TN_FSB);
> +        cfg &= ~(HPET_TN_LEVEL | HPET_TN_PERIODIC);
>          cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
>          hpet_write32(cfg, HPET_Tn_CFG(hpet_events[i].idx));
>  
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel