drivers/thermal/mediatek/lvts_thermal.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
This patch prevents from registering thermal entries and letting the
driver misbehave if efuse data is invalid. A device is not properly
calibrated if the golden temperature is zero.
Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver")
Signed-off-by: Julien Panis <jpanis@baylibre.com>
---
Guard against invalid calibration data, following this discussion:
https://lore.kernel.org/all/ad047631-16b8-42ce-8a8d-1429e6af4517@collabora.com/
---
Changes in v2:
- Add Fixes tag.
- Link to v1: https://lore.kernel.org/r/20240603-mtk-thermal-calib-check-v1-1-5d6bf040414c@baylibre.com
---
drivers/thermal/mediatek/lvts_thermal.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
index 0bb3a495b56e..185d5a32711f 100644
--- a/drivers/thermal/mediatek/lvts_thermal.c
+++ b/drivers/thermal/mediatek/lvts_thermal.c
@@ -769,7 +769,11 @@ static int lvts_golden_temp_init(struct device *dev, u8 *calib,
*/
gt = (((u32 *)calib)[0] >> lvts_data->gt_calib_bit_offset) & 0xff;
- if (gt && gt < LVTS_GOLDEN_TEMP_MAX)
+ /* A zero value for gt means that device has invalid efuse data */
+ if (!gt)
+ return -ENODATA;
+
+ if (gt < LVTS_GOLDEN_TEMP_MAX)
golden_temp = gt;
golden_temp_offset = golden_temp * 500 + lvts_data->temp_offset;
---
base-commit: 632483ea8004edfadd035de36e1ab2c7c4f53158
change-id: 20240603-mtk-thermal-calib-check-ba2ec24a1c32
Best regards,
--
Julien Panis <jpanis@baylibre.com>
Il 04/06/24 18:46, Julien Panis ha scritto: > This patch prevents from registering thermal entries and letting the > driver misbehave if efuse data is invalid. A device is not properly > calibrated if the golden temperature is zero. > > Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver") > Signed-off-by: Julien Panis <jpanis@baylibre.com> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
On 04/06/2024 18:46, Julien Panis wrote: > This patch prevents from registering thermal entries and letting the > driver misbehave if efuse data is invalid. A device is not properly > calibrated if the golden temperature is zero. > > Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver") > Signed-off-by: Julien Panis <jpanis@baylibre.com> > --- > Guard against invalid calibration data, following this discussion: > https://lore.kernel.org/all/ad047631-16b8-42ce-8a8d-1429e6af4517@collabora.com/ > --- Applied for v6.10-rc3 Thanks -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
On Tue, 4 Jun 2024, Julien Panis wrote: > This patch prevents from registering thermal entries and letting the > driver misbehave if efuse data is invalid. A device is not properly > calibrated if the golden temperature is zero. > > Fixes: f5f633b18234 ("thermal/drivers/mediatek: Add the Low Voltage Thermal Sensor driver") > Signed-off-by: Julien Panis <jpanis@baylibre.com> Reviewed-by: Nicolas Pitre <npitre@baylibre.com> > --- > Guard against invalid calibration data, following this discussion: > https://lore.kernel.org/all/ad047631-16b8-42ce-8a8d-1429e6af4517@collabora.com/ > --- > Changes in v2: > - Add Fixes tag. > - Link to v1: https://lore.kernel.org/r/20240603-mtk-thermal-calib-check-v1-1-5d6bf040414c@baylibre.com > --- > drivers/thermal/mediatek/lvts_thermal.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c > index 0bb3a495b56e..185d5a32711f 100644 > --- a/drivers/thermal/mediatek/lvts_thermal.c > +++ b/drivers/thermal/mediatek/lvts_thermal.c > @@ -769,7 +769,11 @@ static int lvts_golden_temp_init(struct device *dev, u8 *calib, > */ > gt = (((u32 *)calib)[0] >> lvts_data->gt_calib_bit_offset) & 0xff; > > - if (gt && gt < LVTS_GOLDEN_TEMP_MAX) > + /* A zero value for gt means that device has invalid efuse data */ > + if (!gt) > + return -ENODATA; > + > + if (gt < LVTS_GOLDEN_TEMP_MAX) > golden_temp = gt; > > golden_temp_offset = golden_temp * 500 + lvts_data->temp_offset; > > --- > base-commit: 632483ea8004edfadd035de36e1ab2c7c4f53158 > change-id: 20240603-mtk-thermal-calib-check-ba2ec24a1c32 > > Best regards, > -- > Julien Panis <jpanis@baylibre.com> > >
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