hwmon: (k10temp) Fix reading critical temperature register

The HTC (Hardware Temperature Control) register has moved
for recent chips.

Cc: stable@vger.kernel.org # v4.16+
Tested-by: Gabriel Craciunescu <nix.or.die@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/k10temp.c

@@ -63,10 +63,12 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
 #define  NB_CAP_HTC			0x00000400
 
 /*
- * For F15h M60h, functionality of REG_REPORTED_TEMPERATURE
- * has been moved to D0F0xBC_xD820_0CA4 [Reported Temperature
- * Control]
+ * For F15h M60h and M70h, REG_HARDWARE_THERMAL_CONTROL
+ * and REG_REPORTED_TEMPERATURE have been moved to
+ * D0F0xBC_xD820_0C64 [Hardware Temperature Control]
+ * D0F0xBC_xD820_0CA4 [Reported Temperature Control]
  */
+#define F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET	0xd8200c64
 #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET	0xd8200ca4
 
 /* F17h M01h Access througn SMN */
@@ -74,6 +76,7 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
 
 struct k10temp_data {
 	struct pci_dev *pdev;
+	void (*read_htcreg)(struct pci_dev *pdev, u32 *regval);
 	void (*read_tempreg)(struct pci_dev *pdev, u32 *regval);
 	int temp_offset;
 	u32 temp_adjust_mask;
@@ -98,6 +101,11 @@ static const struct tctl_offset tctl_offset_table[] = {
 	{ 0x17, "AMD Ryzen Threadripper 1910", 10000 },
 };
 
+static void read_htcreg_pci(struct pci_dev *pdev, u32 *regval)
+{
+	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, regval);
+}
+
 static void read_tempreg_pci(struct pci_dev *pdev, u32 *regval)
 {
 	pci_read_config_dword(pdev, REG_REPORTED_TEMPERATURE, regval);
@@ -114,6 +122,12 @@ static void amd_nb_index_read(struct pci_dev *pdev, unsigned int devfn,
 	mutex_unlock(&nb_smu_ind_mutex);
 }
 
+static void read_htcreg_nb_f15(struct pci_dev *pdev, u32 *regval)
+{
+	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
+			  F15H_M60H_HARDWARE_TEMP_CTRL_OFFSET, regval);
+}
+
 static void read_tempreg_nb_f15(struct pci_dev *pdev, u32 *regval)
 {
 	amd_nb_index_read(pdev, PCI_DEVFN(0, 0), 0xb8,
@@ -160,8 +174,7 @@ static ssize_t show_temp_crit(struct device *dev,
 	u32 regval;
 	int value;
 
-	pci_read_config_dword(data->pdev,
-			      REG_HARDWARE_THERMAL_CONTROL, &regval);
+	data->read_htcreg(data->pdev, &regval);
 	value = ((regval >> 16) & 0x7f) * 500 + 52000;
 	if (show_hyst)
 		value -= ((regval >> 24) & 0xf) * 500;
@@ -181,13 +194,18 @@ static umode_t k10temp_is_visible(struct kobject *kobj,
 	struct pci_dev *pdev = data->pdev;
 
 	if (index >= 2) {
-		u32 reg_caps, reg_htc;
+		u32 reg;
+
+		if (!data->read_htcreg)
+			return 0;
 
 		pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES,
-				      &reg_caps);
-		pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL,
-				      &reg_htc);
-		if (!(reg_caps & NB_CAP_HTC) || !(reg_htc & HTC_ENABLE))
+				      &reg);
+		if (!(reg & NB_CAP_HTC))
+			return 0;
+
+		data->read_htcreg(data->pdev, &reg);
+		if (!(reg & HTC_ENABLE))
 			return 0;
 	}
 	return attr->mode;
@@ -268,11 +286,13 @@ static int k10temp_probe(struct pci_dev *pdev,
 
 	if (boot_cpu_data.x86 == 0x15 && (boot_cpu_data.x86_model == 0x60 ||
 					  boot_cpu_data.x86_model == 0x70)) {
+		data->read_htcreg = read_htcreg_nb_f15;
 		data->read_tempreg = read_tempreg_nb_f15;
 	} else if (boot_cpu_data.x86 == 0x17) {
 		data->temp_adjust_mask = 0x80000;
 		data->read_tempreg = read_tempreg_nb_f17;
 	} else {
+		data->read_htcreg = read_htcreg_pci;
 		data->read_tempreg = read_tempreg_pci;
 	}