linux-kernel - Re: [PATCH] Blacklist Dell Optiplex 320 from using the HPET

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Date:	Sat, 05 May 2007 16:30:35 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	john stultz <johnstul@...ibm.com>
Cc:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	"Guilherme M. Schroeder" <guilherme@...tralinf.com.br>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Blacklist Dell Optiplex 320 from using the HPET

Guilherme,

please discard the previous patch. I missed to refresh it before sending
it out. Correct version below.

	tglx	

On Sat, 2007-05-05 at 16:26 +0200, Thomas Gleixner wrote:
> can you please undo John's patch and check whether the patch below works
> for you.

Index: linux-2.6.21/arch/i386/kernel/hpet.c
===================================================================
--- linux-2.6.21.orig/arch/i386/kernel/hpet.c
+++ linux-2.6.21/arch/i386/kernel/hpet.c
@@ -231,6 +231,7 @@ int __init hpet_enable(void)
 {
 	unsigned long id;
 	uint64_t hpet_freq;
+	cycle_t t1;
 	u64 tmp;
 
 	if (!is_hpet_capable())
@@ -278,6 +279,14 @@ int __init hpet_enable(void)
 	/* Start the counter */
 	hpet_start_counter();
 
+	/* Verify whether hpet counter works */
+	t1 = read_hpet();
+	udelay(50);
+	if (t1 == read_hpet()) {
+		printk(KERN_WARNING "HPET counter is defect\n");
+		goto out_nohpet;
+	}
+
 	/* Initialize and register HPET clocksource
 	 *
 	 * hpet period is in femto seconds per cycle


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