[RFC PATCH 05/15] hwmon: Fix Intel family checks to include extended family numbers

[Sohil Mehta]

The current Intel family-model checks in the coretemp driver seem to
implicitly assume family 6. Extend the checks to include the extended
family numbers beyond 15 as well.

Also, add explicit checks for family 6 in places where it is assumed
implicitly.

x86_model checks seem inconsistent and scattered throughout the driver.
Consolidating and converting them to VFM ones would be a useful addition
in future.

Signed-off-by: Sohil Mehta <sohil.mehta@xxxxxxxxx>
---
 drivers/hwmon/coretemp.c | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 1b9203b20d70..1aa67a2b5f18 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -185,6 +185,13 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 			return tjmax_table[i].tjmax;
 	}
 
+	/*
+	 * Return without adjustment if the Family isn't 6.
+	 * The rest of the function assumes Family 6.
+	 */
+	if (c->x86 != 6)
+		return tjmax;
+
 	for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
 		const struct tjmax_model *tm = &tjmax_model_table[i];
 		if (c->x86_model == tm->model &&
@@ -260,14 +267,17 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 
 static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
 {
+	u8 family = c->x86;
 	u8 model = c->x86_model;
 
-	return model > 0xe &&
-	       model != 0x1c &&
-	       model != 0x26 &&
-	       model != 0x27 &&
-	       model != 0x35 &&
-	       model != 0x36;
+	return family > 15 ||
+	       (family == 6 &&
+		model > 0xe &&
+		model != 0x1c &&
+		model != 0x26 &&
+		model != 0x27 &&
+		model != 0x35 &&
+		model != 0x36);
 }
 
 static int get_tjmax(struct temp_data *tdata, struct device *dev)
@@ -460,7 +470,7 @@ static int chk_ucode_version(unsigned int cpu)
 	 * Readings might stop update when processor visited too deep sleep,
 	 * fixed for stepping D0 (6EC).
 	 */
-	if (c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
+	if (c->x86 == 6 && c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
 		pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
 		return -ENODEV;
 	}
@@ -580,7 +590,7 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
 	 * MSR_IA32_TEMPERATURE_TARGET register. Atoms don't have the register
 	 * at all.
 	 */
-	if (c->x86_model > 0xe && c->x86_model != 0x1c)
+	if (c->x86 > 15 || (c->x86 == 6 && c->x86_model > 0xe && c->x86_model != 0x1c))
 		if (get_ttarget(tdata, &pdev->dev) >= 0)
 			tdata->attr_size++;
 
-- 
2.43.0