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thermal/drivers/qcom/tsens-v0_1: Add mdm9607 correction offsets 

According to the msm-3.18 vendor kernel from Qualcomm, mdm9607 needs
"correction factors" to adjust for additional offsets observed after the
factory calibration values in the fuses [1, 2].

The fixed offsets should be applied unless there is a special
calibration mode value that indicates that no offsets are needed [3].

Note that the new calibration mode values are called differently in this
patch compared to the vendor kernel:
  - TSENS_TWO_POINT_CALIB_N_WA        -> ONE_PT_CALIB2_NO_OFFSET
  - TSENS_TWO_POINT_CALIB_N_OFFSET_WA -> TWO_PT_CALIB_NO_OFFSET
This is because close inspection of the calibration function [3] reveals
that TSENS_TWO_POINT_CALIB_N_WA is actually a "one point" calibration
because the if statements skip all "point2" related code for it.

[1]: d9d2db1b82
[2]: d75aef53a7
[3]: https://git.codelinaro.org/clo/la/kernel/msm-3.18/-/blob/LE.UM.4.3.2.r1-04200-9x07/drivers/thermal/msm-tsens.c#L2987-3136

Fixes: a2149ab815 ("thermal/drivers/qcom/tsens-v0_1: Add support for MDM9607")
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Stephan Gerhold <stephan.gerhold@kernkonzept.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20230508-msm8909-tsens-v5-3-5eb632235ba7@kernkonzept.com
This commit is contained in:
Stephan Gerhold 2023-06-07 12:47:46 +02:00 committed by Daniel Lezcano
parent 6812d1dfbc
commit b6f739da00
3 changed files with 30 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/thermal/qcom/tsens-v0_1.c
View File

@ -241,6 +241,17 @@ static int __init init_9607(struct tsens_priv *priv)
for (i = 0; i < priv->num_sensors; ++i)
priv->sensor[i].slope = 3000;
priv->sensor[0].p1_calib_offset = 1;
priv->sensor[0].p2_calib_offset = 1;
priv->sensor[1].p1_calib_offset = -4;
priv->sensor[1].p2_calib_offset = -2;
priv->sensor[2].p1_calib_offset = 4;
priv->sensor[2].p2_calib_offset = 8;
priv->sensor[3].p1_calib_offset = -3;
priv->sensor[3].p2_calib_offset = -5;
priv->sensor[4].p1_calib_offset = -4;
priv->sensor[4].p2_calib_offset = -4;
return init_common(priv);
}

16
drivers/thermal/qcom/tsens.c
View File

@ -134,10 +134,12 @@ int tsens_read_calibration(struct tsens_priv *priv, int shift, u32 *p1, u32 *p2,
p1[i] = p1[i] + (base1 << shift);
break;
case TWO_PT_CALIB:
case TWO_PT_CALIB_NO_OFFSET:
for (i = 0; i < priv->num_sensors; i++)
p2[i] = (p2[i] + base2) << shift;
fallthrough;
case ONE_PT_CALIB2:
case ONE_PT_CALIB2_NO_OFFSET:
for (i = 0; i < priv->num_sensors; i++)
p1[i] = (p1[i] + base1) << shift;
break;
@ -149,6 +151,18 @@ int tsens_read_calibration(struct tsens_priv *priv, int shift, u32 *p1, u32 *p2,
}
}
/* Apply calibration offset workaround except for _NO_OFFSET modes */
switch (mode) {
case TWO_PT_CALIB:
for (i = 0; i < priv->num_sensors; i++)
p2[i] += priv->sensor[i].p2_calib_offset;
fallthrough;
case ONE_PT_CALIB2:
for (i = 0; i < priv->num_sensors; i++)
p1[i] += priv->sensor[i].p1_calib_offset;
break;
}
return mode;
}
@ -254,7 +268,7 @@ void compute_intercept_slope(struct tsens_priv *priv, u32 *p1,
if (!priv->sensor[i].slope)
priv->sensor[i].slope = SLOPE_DEFAULT;
if (mode == TWO_PT_CALIB) {
if (mode == TWO_PT_CALIB || mode == TWO_PT_CALIB_NO_OFFSET) {
/*
* slope (m) = adc_code2 - adc_code1 (y2 - y1)/
* temp_120_degc - temp_30_degc (x2 - x1)

4
drivers/thermal/qcom/tsens.h
View File

@ -10,6 +10,8 @@
#define ONE_PT_CALIB 0x1
#define ONE_PT_CALIB2 0x2
#define TWO_PT_CALIB 0x3
#define ONE_PT_CALIB2_NO_OFFSET 0x6
#define TWO_PT_CALIB_NO_OFFSET 0x7
#define CAL_DEGC_PT1 30
#define CAL_DEGC_PT2 120
#define SLOPE_FACTOR 1000
@ -57,6 +59,8 @@ struct tsens_sensor {
unsigned int hw_id;
int slope;
u32 status;
int p1_calib_offset;
int p2_calib_offset;
};
/**