[PATCH v3 3/6] thermal: tegra: soctherm-fuse: prepare calibration for Tegra114 support

Svyatoslav Ryhel
2025-08-20T11:43:01Z

The Tegra114 has a different fuse calibration register layout and address
compared to other Tegra SoCs, requiring SOCTHERM shift, mask, register
address, and nominal calibration values to be configurable.

Additionally, a use_lower_precision option was implemented to account for
the Tegra114's 0.5C thermal data output, which differs from the 1C
precision of newer SoCs.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
drivers/thermal/tegra/soctherm-fuse.c | 31 ++++++++++++++++-------
drivers/thermal/tegra/soctherm.h | 8 +++++-
drivers/thermal/tegra/tegra124-soctherm.c | 6 +++++
drivers/thermal/tegra/tegra132-soctherm.c | 6 +++++
drivers/thermal/tegra/tegra210-soctherm.c | 6 +++++
5 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/drivers/thermal/tegra/soctherm-fuse.c b/drivers/thermal/tegra/soctherm-fuse.c
index 190f95280e0b..d27876dd9b2a 100644
--- a/drivers/thermal/tegra/soctherm-fuse.c
+++ b/drivers/thermal/tegra/soctherm-fuse.c
@@ -9,15 +9,10 @@

#include "soctherm.h"

-#define NOMINAL_CALIB_FT 105
-#define NOMINAL_CALIB_CP 25
-
#define FUSE_TSENSOR_CALIB_CP_TS_BASE_MASK 0x1fff
#define FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK (0x1fff << 13)
#define FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT 13

-#define FUSE_TSENSOR_COMMON 0x180
-
/*
* Tegra210: Layout of bits in FUSE_TSENSOR_COMMON:
* 3 2 1 0
@@ -26,7 +21,7 @@
* | BASE_FT | BASE_CP | SHFT_FT | SHIFT_CP |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
- * Tegra12x, etc:
+ * Tegra124:
* In chips prior to Tegra210, this fuse was incorrectly sized as 26 bits,
* and didn't hold SHIFT_CP in [31:26]. Therefore these missing six bits
* were obtained via the FUSE_SPARE_REALIGNMENT_REG register [5:0].
@@ -44,6 +39,13 @@
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |---------------------------------------------------| SHIFT_CP |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Tegra114: Layout of bits in FUSE_TSENSOR_COMMON aka FUSE_VSENSOR_CALIB:
+ * 3 2 1 0
+ * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | SHFT_FT | BASE_FT | SHIFT_CP | BASE_CP |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/

#define CALIB_COEFFICIENT 1000000LL
@@ -77,7 +79,7 @@ int tegra_calc_shared_calib(const struct tegra_soctherm_fuse *tfuse,
s32 shifted_cp, shifted_ft;
int err;

- err = tegra_fuse_readl(FUSE_TSENSOR_COMMON, &val);
+ err = tegra_fuse_readl(tfuse->fuse_common_reg, &val);
if (err)
return err;

@@ -96,10 +98,21 @@ int tegra_calc_shared_calib(const struct tegra_soctherm_fuse *tfuse,
return err;
}

+ shifted_cp = (val & tfuse->fuse_shift_cp_mask) >>
+ tfuse->fuse_shift_cp_shift;
shifted_cp = sign_extend32(val, 5);

- shared->actual_temp_cp = 2 * NOMINAL_CALIB_CP + shifted_cp;
- shared->actual_temp_ft = 2 * NOMINAL_CALIB_FT + shifted_ft;
+ shared->actual_temp_cp = 2 * tfuse->nominal_calib_cp + shifted_cp;
+ shared->actual_temp_ft = 2 * tfuse->nominal_calib_ft + shifted_ft;
+
+ /*
+ * Tegra114 provides fuse thermal corrections in 0.5C while newer
+ * SoCs provide data in 1C
+ */
+ if (tfuse->use_lower_precision) {
+ shared->actual_temp_cp /= 2;
+ shared->actual_temp_ft /= 2;
+ }

return 0;
}
diff --git a/drivers/thermal/tegra/soctherm.h b/drivers/thermal/tegra/soctherm.h
index 70501e73d586..f8d76ae716fe 100644
--- a/drivers/thermal/tegra/soctherm.h
+++ b/drivers/thermal/tegra/soctherm.h
@@ -56,6 +56,9 @@
#define SENSOR_TEMP2_MEM_TEMP_MASK (0xffff << 16)
#define SENSOR_TEMP2_PLLX_TEMP_MASK 0xffff

+#define FUSE_VSENSOR_CALIB 0x08c
+#define FUSE_TSENSOR_COMMON 0x180
+
/**
* struct tegra_tsensor_group - SOC_THERM sensor group data
* @name: short name of the temperature sensor group
@@ -109,9 +112,12 @@ struct tsensor_group_thermtrips {

struct tegra_soctherm_fuse {
u32 fuse_base_cp_mask, fuse_base_cp_shift;
+ u32 fuse_shift_cp_mask, fuse_shift_cp_shift;
u32 fuse_base_ft_mask, fuse_base_ft_shift;
u32 fuse_shift_ft_mask, fuse_shift_ft_shift;
- u32 fuse_spare_realignment;
+ u32 fuse_common_reg, fuse_spare_realignment;
+ u32 nominal_calib_cp, nominal_calib_ft;
+ bool use_lower_precision;
};

struct tsensor_shared_calib {
diff --git a/drivers/thermal/tegra/tegra124-soctherm.c b/drivers/thermal/tegra/tegra124-soctherm.c
index 20ad27f4d1a1..e0a40ca2a6ac 100644
--- a/drivers/thermal/tegra/tegra124-soctherm.c
+++ b/drivers/thermal/tegra/tegra124-soctherm.c
@@ -200,11 +200,17 @@ static const struct tegra_tsensor tegra124_tsensors[] = {
static const struct tegra_soctherm_fuse tegra124_soctherm_fuse = {
.fuse_base_cp_mask = 0x3ff,
.fuse_base_cp_shift = 0,
+ .fuse_shift_cp_mask = 0x1f,
+ .fuse_shift_cp_shift = 0,
.fuse_base_ft_mask = 0x7ff << 10,
.fuse_base_ft_shift = 10,
.fuse_shift_ft_mask = 0x1f << 21,
.fuse_shift_ft_shift = 21,
+ .fuse_common_reg = FUSE_TSENSOR_COMMON,
.fuse_spare_realignment = 0x1fc,
+ .nominal_calib_cp = 25,
+ .nominal_calib_ft = 105,
+ .use_lower_precision = false,
};

const struct tegra_soctherm_soc tegra124_soctherm = {
diff --git a/drivers/thermal/tegra/tegra132-soctherm.c b/drivers/thermal/tegra/tegra132-soctherm.c
index b76308fdad9e..138d76c67114 100644
--- a/drivers/thermal/tegra/tegra132-soctherm.c
+++ b/drivers/thermal/tegra/tegra132-soctherm.c
@@ -200,11 +200,17 @@ static struct tegra_tsensor tegra132_tsensors[] = {
static const struct tegra_soctherm_fuse tegra132_soctherm_fuse = {
.fuse_base_cp_mask = 0x3ff,
.fuse_base_cp_shift = 0,
+ .fuse_shift_cp_mask = 0x1f,
+ .fuse_shift_cp_shift = 0,
.fuse_base_ft_mask = 0x7ff << 10,
.fuse_base_ft_shift = 10,
.fuse_shift_ft_mask = 0x1f << 21,
.fuse_shift_ft_shift = 21,
+ .fuse_common_reg = FUSE_TSENSOR_COMMON,
.fuse_spare_realignment = 0x1fc,
+ .nominal_calib_cp = 25,
+ .nominal_calib_ft = 105,
+ .use_lower_precision = false,
};

const struct tegra_soctherm_soc tegra132_soctherm = {
diff --git a/drivers/thermal/tegra/tegra210-soctherm.c b/drivers/thermal/tegra/tegra210-soctherm.c
index d0ff793f18c5..1127b4d28087 100644
--- a/drivers/thermal/tegra/tegra210-soctherm.c
+++ b/drivers/thermal/tegra/tegra210-soctherm.c
@@ -201,11 +201,17 @@ static const struct tegra_tsensor tegra210_tsensors[] = {
static const struct tegra_soctherm_fuse tegra210_soctherm_fuse = {
.fuse_base_cp_mask = 0x3ff << 11,
.fuse_base_cp_shift = 11,
+ .fuse_shift_cp_mask = 0x1f,
+ .fuse_shift_cp_shift = 0,
.fuse_base_ft_mask = 0x7ff << 21,
.fuse_base_ft_shift = 21,
.fuse_shift_ft_mask = 0x1f << 6,
.fuse_shift_ft_shift = 6,
+ .fuse_common_reg = FUSE_TSENSOR_COMMON,
.fuse_spare_realignment = 0,
+ .nominal_calib_cp = 25,
+ .nominal_calib_ft = 105,
+ .use_lower_precision = false,
};

static struct tsensor_group_thermtrips tegra210_tsensor_thermtrips[] = {
--
2.48.1