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path: root/drivers/hwmon/k10temp.c
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Diffstat (limited to 'drivers/hwmon/k10temp.c')
-rw-r--r--drivers/hwmon/k10temp.c40
1 files changed, 33 insertions, 7 deletions
diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index d8a26d16d94..099a2138cdf 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -33,6 +33,16 @@ static bool force;
module_param(force, bool, 0444);
MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
+/* CPUID function 0x80000001, ebx */
+#define CPUID_PKGTYPE_MASK 0xf0000000
+#define CPUID_PKGTYPE_F 0x00000000
+#define CPUID_PKGTYPE_AM2R2_AM3 0x10000000
+
+/* DRAM controller (PCI function 2) */
+#define REG_DCT0_CONFIG_HIGH 0x094
+#define DDR3_MODE 0x00000100
+
+/* miscellaneous (PCI function 3) */
#define REG_HARDWARE_THERMAL_CONTROL 0x64
#define HTC_ENABLE 0x00000001
@@ -85,13 +95,28 @@ static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
-static bool __devinit has_erratum_319(void)
+static bool __devinit has_erratum_319(struct pci_dev *pdev)
{
+ u32 pkg_type, reg_dram_cfg;
+
+ if (boot_cpu_data.x86 != 0x10)
+ return false;
+
/*
- * Erratum 319: The thermal sensor of older Family 10h processors
- * (B steppings) may be unreliable.
+ * Erratum 319: The thermal sensor of Socket F/AM2+ processors
+ * may be unreliable.
*/
- return boot_cpu_data.x86 == 0x10 && boot_cpu_data.x86_model <= 2;
+ pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK;
+ if (pkg_type == CPUID_PKGTYPE_F)
+ return true;
+ if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3)
+ return false;
+
+ /* Differentiate between AM2+ (bad) and AM3 (good) */
+ pci_bus_read_config_dword(pdev->bus,
+ PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
+ REG_DCT0_CONFIG_HIGH, &reg_dram_cfg);
+ return !(reg_dram_cfg & DDR3_MODE);
}
static int __devinit k10temp_probe(struct pci_dev *pdev,
@@ -99,9 +124,10 @@ static int __devinit k10temp_probe(struct pci_dev *pdev,
{
struct device *hwmon_dev;
u32 reg_caps, reg_htc;
+ int unreliable = has_erratum_319(pdev);
int err;
- if (has_erratum_319() && !force) {
+ if (unreliable && !force) {
dev_err(&pdev->dev,
"unreliable CPU thermal sensor; monitoring disabled\n");
err = -ENODEV;
@@ -139,7 +165,7 @@ static int __devinit k10temp_probe(struct pci_dev *pdev,
}
dev_set_drvdata(&pdev->dev, hwmon_dev);
- if (has_erratum_319() && force)
+ if (unreliable && force)
dev_warn(&pdev->dev,
"unreliable CPU thermal sensor; check erratum 319\n");
return 0;
@@ -169,7 +195,7 @@ static void __devexit k10temp_remove(struct pci_dev *pdev)
dev_set_drvdata(&pdev->dev, NULL);
}
-static struct pci_device_id k10temp_id_table[] = {
+static const struct pci_device_id k10temp_id_table[] = {
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
{}