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thermal/drivers/mediatek/lvts: Support MSR offset for 16-bit calibration data

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On MT8196/MT6991, per-sensor calibration data read from eFuses is
16-bit. When the LVTS controller operates in 16-bit mode, a fixed offset
must be added to MSR values during post-processing to obtain correct
temperature readings. Introduce a new msr_offset field in lvts_data,
program the respective register and apply the offset to the calibration
data read from eFuses.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Laura Nao <laura.nao@collabora.com>
Link: https://patch.msgid.link/20251125-mt8196-lvts-v4-v5-6-6db7eb903fb7@collabora.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Laura Nao 2025-11-25 17:16:56 +01:00 committed by Daniel Lezcano
parent 6cd9a3b23a
commit b5468be97f
1 changed files with 16 additions and 0 deletions
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16
drivers/thermal/mediatek/lvts_thermal.c
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@ -44,6 +44,7 @@
#define LVTS_EDATA01(__base) (__base + 0x0058)
#define LVTS_EDATA02(__base) (__base + 0x005C)
#define LVTS_EDATA03(__base) (__base + 0x0060)
#define LVTS_MSROFT(__base) (__base + 0x006C)
#define LVTS_ATP0(__base) (__base + 0x0070)
#define LVTS_ATP1(__base) (__base + 0x0074)
#define LVTS_ATP2(__base) (__base + 0x0078)
@ -151,6 +152,7 @@ struct lvts_data {
int temp_offset;
int gt_calib_bit_offset;
unsigned int def_calibration;
u16 msr_offset;
};
struct lvts_sensor {
@ -219,6 +221,7 @@ static const struct debugfs_reg32 lvts_regs[] = {
LVTS_DEBUG_FS_REGS(LVTS_EDATA01),
LVTS_DEBUG_FS_REGS(LVTS_EDATA02),
LVTS_DEBUG_FS_REGS(LVTS_EDATA03),
LVTS_DEBUG_FS_REGS(LVTS_MSROFT),
LVTS_DEBUG_FS_REGS(LVTS_ATP0),
LVTS_DEBUG_FS_REGS(LVTS_ATP1),
LVTS_DEBUG_FS_REGS(LVTS_ATP2),
@ -811,6 +814,8 @@ static int lvts_calibration_init(struct device *dev, struct lvts_ctrl *lvts_ctrl
if (gt) {
lvts_ctrl->calibration[i] = calib;
if (lvts_ctrl->lvts_data->msr_offset)
lvts_ctrl->calibration[i] += lvts_ctrl->lvts_data->msr_offset;
} else if (lvts_ctrl->lvts_data->def_calibration) {
lvts_ctrl->calibration[i] = lvts_ctrl->lvts_data->def_calibration;
} else {
@ -1118,6 +1123,17 @@ static int lvts_ctrl_calibrate(struct device *dev, struct lvts_ctrl *lvts_ctrl)
for (i = 0; i < LVTS_SENSOR_MAX; i++)
writel(lvts_ctrl->calibration[i], lvts_edata[i]);
/* LVTS_MSROFT : Constant offset applied to MSR values
* for post-processing
*
* Bits:
*
* 20-0 : Constant data added to MSR values
*/
if (lvts_ctrl->lvts_data->msr_offset)
writel(lvts_ctrl->lvts_data->msr_offset,
LVTS_MSROFT(lvts_ctrl->base));
return 0;
}