linux-kernel - [PATCH] hwmon: (k10temp): Check range scale when CUR

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Date:   Thu, 13 Apr 2023 16:39:58 -0500
From:   Babu Moger <babu.moger@....com>
To:     <clemens@...isch.de>, <jdelvare@...e.com>, <linux@...ck-us.net>
CC:     <linux-hwmon@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <babu.moger@....com>, <Baski.Kannan@....com>,
        <yannick.hemery@...p.ovh.com>
Subject: [PATCH] hwmon: (k10temp): Check range scale when CUR_TEMP register is read-write

From: Babu Moger <Babu.Moger@....com>

Spec says, when CUR_TEMP_TJ_SEL == 3 and CUR_TEMP_RANGE_SEL == 0,
it should use RangeUnadjusted is 0, which is (CurTmp*0.125 -49) C. The
CUR_TEMP register is read-write when CUR_TEMP_TJ_SEL == 3 (bit 17-16).

Add the check to detect it.

Sensors command's output before the patch.
$sensors
 k10temp-pci-00c3
 Adapter: PCI adapter
 Tctl:         +76.6°C <- Wrong value
 Tccd1:        +26.5°C
 Tccd2:        +27.5°C
 Tccd3:        +27.2°C
 Tccd4:        +27.5°C
 Tccd5:        +26.0°C
 Tccd6:        +26.2°C
 Tccd7:        +25.0°C
 Tccd8:        +26.5°C

Sensors command's output after the patch.
$sensors
 k10temp-pci-00c3
 Adapter: PCI adapter
 Tctl:         +28.8°C <- corrected value
 Tccd1:        +27.5°C
 Tccd2:        +28.5°C
 Tccd3:        +28.5°C
 Tccd4:        +28.5°C
 Tccd5:        +27.0°C
 Tccd6:        +27.5°C
 Tccd7:        +27.0°C
 Tccd8:        +27.5°C

Signed-off-by: Babu Moger <babu.moger@....com>
---
 drivers/hwmon/k10temp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 5a9d47a229e4..be8bbb1c3a02 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -75,6 +75,7 @@ static DEFINE_MUTEX(nb_smu_ind_mutex);
 
 #define ZEN_CUR_TEMP_SHIFT			21
 #define ZEN_CUR_TEMP_RANGE_SEL_MASK		BIT(19)
+#define ZEN_CUR_TEMP_TJ_SEL_MASK		GENMASK(17, 16)
 
 struct k10temp_data {
 	struct pci_dev *pdev;
@@ -155,7 +156,8 @@ static long get_raw_temp(struct k10temp_data *data)
 
 	data->read_tempreg(data->pdev, &regval);
 	temp = (regval >> ZEN_CUR_TEMP_SHIFT) * 125;
-	if (regval & data->temp_adjust_mask)
+	if ((regval & data->temp_adjust_mask) ||
+	    (regval & ZEN_CUR_TEMP_TJ_SEL_MASK) == ZEN_CUR_TEMP_TJ_SEL_MASK)
 		temp -= 49000;
 	return temp;
 }
-- 
2.34.1