linux-kernel - [PATCH] hwmon: (coretemp) Fix TjMax for Atom N450/D410/D510 CPUs

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Date:	Thu, 24 Dec 2009 15:31:02 +0800
From:	Yong Wang <yong.y.wang@...ux.intel.com>
To:	Rudolf Marek <r.marek@...embler.cz>,
	Huaxu Wan <huaxu.wan@...el.com>,
	Jean Delvare <khali@...ux-fr.org>
Cc:	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (coretemp) Fix TjMax for Atom N450/D410/D510 CPUs

The max junction temperature of Atom N450/D410/D510 CPUs is 100 degrees Celsius.
Since these CPUs are always coupled with Intel NM10 chipset in one package, the
best way to verify whether an Atom CPU is N450/D410/D510 is to check the host
bridge device.

Signed-off-by: Yong Wang <yong.y.wang@...el.com>
Acked-by: Huaxu Wan <huaxu.wan@...el.com>
---
 drivers/hwmon/coretemp.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index caef39c..65a33ec 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -33,6 +33,7 @@
 #include <linux/list.h>
 #include <linux/platform_device.h>
 #include <linux/cpu.h>
+#include <linux/pci.h>
 #include <asm/msr.h>
 #include <asm/processor.h>
 
@@ -161,6 +162,7 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *
 	int usemsr_ee = 1;
 	int err;
 	u32 eax, edx;
+	struct pci_dev *host_bridge;
 
 	/* Early chips have no MSR for TjMax */
 
@@ -168,11 +170,21 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *
 		usemsr_ee = 0;
 	}
 
-	/* Atoms seems to have TjMax at 90C */
+	/* Atoms CPUs */
 
 	if (c->x86_model == 0x1c) {
 		usemsr_ee = 0;
-		tjmax = 90000;
+
+		host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
+
+		if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL
+		    && (host_bridge->device == 0xa000	/* NM10 based nettop */
+		    || host_bridge->device == 0xa010))	/* NM10 based netbook */
+			tjmax = 100000;
+		else
+			tjmax = 90000;
+
+		pci_dev_put(host_bridge);
 	}
 
 	if ((c->x86_model > 0xe) && (usemsr_ee)) {
--
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