Re: [PATCH v2 1/5] thermal/drivers/tsens: Add TSENS enable and calibration support for V2

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 7/12/2023 5:52 PM, Dmitry Baryshkov wrote:
On 12/07/2023 14:35, Praveenkumar I wrote:
SoCs without RPM have to enable sensors and calibrate from the kernel.
Though TSENS IP supports 16 sensors, not all are used. So used hw_id
to enable the relevant sensors.

Added new calibration function for V2 as the tsens.c calib function
only supports V1.

Signed-off-by: Praveenkumar I <quic_ipkumar@xxxxxxxxxxx>
---
[v2]:
    Added separate init function for tsens v2 which calls init_common
    and initialize the remaining fields. Reformatted calibrate function
    and used hw_ids for sensors to enable.

  drivers/thermal/qcom/tsens-v2.c | 144 ++++++++++++++++++++++++++++++++
  drivers/thermal/qcom/tsens.c    |   2 +-
  drivers/thermal/qcom/tsens.h    |   3 +
  3 files changed, 148 insertions(+), 1 deletion(-)

diff --git a/drivers/thermal/qcom/tsens-v2.c b/drivers/thermal/qcom/tsens-v2.c
index 29a61d2d6ca3..ba74d971fe95 100644
--- a/drivers/thermal/qcom/tsens-v2.c
+++ b/drivers/thermal/qcom/tsens-v2.c
@@ -6,11 +6,23 @@
    #include <linux/bitops.h>
  #include <linux/regmap.h>
+#include <linux/nvmem-consumer.h>
  #include "tsens.h"
    /* ----- SROT ------ */
  #define SROT_HW_VER_OFF    0x0000
  #define SROT_CTRL_OFF        0x0004
+#define SROT_MEASURE_PERIOD    0x0008
+#define SROT_Sn_CONVERSION    0x0060
+#define V2_SHIFT_DEFAULT    0x0003
+#define V2_SLOPE_DEFAULT    0x0cd0
+#define V2_CZERO_DEFAULT    0x016a
+#define ONE_PT_SLOPE        0x0cd0
+#define TWO_PT_SHIFTED_GAIN    921600
+#define ONE_PT_CZERO_CONST    94
+#define SENSOR_CONVERSION(n)    (((n) * 4) + SROT_Sn_CONVERSION)
+#define CONVERSION_SLOPE_SHIFT    10
+#define CONVERSION_SHIFT_SHIFT    23
    /* ----- TM ------ */
  #define TM_INT_EN_OFF            0x0004
@@ -59,6 +71,11 @@ static const struct reg_field tsens_v2_regfields[MAX_REGFIELDS] = {
      /* CTRL_OFF */
      [TSENS_EN]     = REG_FIELD(SROT_CTRL_OFF,    0,  0),
      [TSENS_SW_RST] = REG_FIELD(SROT_CTRL_OFF,    1,  1),
+    [SENSOR_EN]    = REG_FIELD(SROT_CTRL_OFF,    3,  18),
+    [CODE_OR_TEMP] = REG_FIELD(SROT_CTRL_OFF,    21, 21),
+
+    /* MAIN_MEASURE_PERIOD */
+    [MAIN_MEASURE_PERIOD] = REG_FIELD(SROT_MEASURE_PERIOD, 0, 7),
        /* ----- TM ------ */
      /* INTERRUPT ENABLE */
@@ -104,6 +121,133 @@ static const struct reg_field tsens_v2_regfields[MAX_REGFIELDS] = {
      [TRDY] = REG_FIELD(TM_TRDY_OFF, 0, 0),
  };
  +static int tsens_v2_calibrate_sensor(struct device *dev, struct tsens_sensor *sensor, +                     struct regmap *map,  u32 mode, u32 base0, u32 base1)
+{
+    u32 slope, czero, val;
+    char name[15];
+    int ret;
+
+    /* Read offset value */
+    ret = snprintf(name, sizeof(name), "s%d", sensor->hw_id);
+    if (ret < 0)
+        return ret;
+
+    ret = nvmem_cell_read_variable_le_u32(dev, name, &sensor->offset);
+    if (ret)
+        return ret;
+
+    /* Based on calib mode, program SHIFT, SLOPE and CZERO */
+    switch (mode) {
+    case TWO_PT_CALIB:
+        slope = (TWO_PT_SHIFTED_GAIN / (base1 - base0));
+
+        czero = (base0 + sensor->offset - ((base1 - base0) / 3));
+
+        val = (V2_SHIFT_DEFAULT << CONVERSION_SHIFT_SHIFT) |
+              (slope << CONVERSION_SLOPE_SHIFT) | czero;
+
+        fallthrough;
+    case ONE_PT_CALIB2:
+        czero = base0 + sensor->offset - ONE_PT_CZERO_CONST;
+
+        val = (V2_SHIFT_DEFAULT << CONVERSION_SHIFT_SHIFT) |
+              (ONE_PT_SLOPE << CONVERSION_SLOPE_SHIFT) | czero;
+
+        break;
+    default:
+        dev_dbg(dev, "calibrationless mode\n");
+
+        val = (V2_SHIFT_DEFAULT << CONVERSION_SHIFT_SHIFT) |
+              (V2_SLOPE_DEFAULT << CONVERSION_SLOPE_SHIFT) | V2_CZERO_DEFAULT;
+    }
+
+    regmap_write(map, SENSOR_CONVERSION(sensor->hw_id), val);
+
+    return 0;
+}
+
+static int tsens_v2_calibration(struct tsens_priv *priv)
+{
+    struct device *dev = priv->dev;
+    u32 mode, base0, base1;
+    int i, ret;
+
+    if (priv->num_sensors > MAX_SENSORS)
+        return -EINVAL;
+
+    ret = nvmem_cell_read_variable_le_u32(priv->dev, "mode", &mode);
+    if (ret == -ENOENT)
+        dev_warn(priv->dev, "Calibration data not present in DT\n");
+    if (ret < 0)
+        return ret;
+
+    dev_dbg(priv->dev, "calibration mode is %d\n", mode);
+
+    ret = nvmem_cell_read_variable_le_u32(priv->dev, "base0", &base0);
+    if (ret < 0)
+        return ret;
+
+    ret = nvmem_cell_read_variable_le_u32(priv->dev, "base1", &base1);
+    if (ret < 0)
+        return ret;
+
+    /* Calibrate each sensor */
+    for (i = 0; i < priv->num_sensors; i++) {
+        ret = tsens_v2_calibrate_sensor(dev, &priv->sensor[i], priv->srot_map,
+                        mode, base0, base1);
+        if (ret < 0)
+            return ret;
+    }
+
+    return 0;
+}
+
+static int __init init_tsens_v2(struct tsens_priv *priv)
+{
+    int i, ret;
+    u32 val = 0;
+    struct device *dev = priv->dev;
+
+    ret = init_common(priv);
+    if (ret < 0)
+        return ret;
+
+    if (priv->feat->ver_major != VER_2_X_NO_RPM)
+        return 0;

No need to, you can rename the function to init_tsens_v2_no_rpm(h?) and use it just for non-rpm platforms.
Sure, will remove the version check and rename the function.

+
+    priv->rf[CODE_OR_TEMP] = devm_regmap_field_alloc(dev, priv->srot_map,
+                             priv->fields[CODE_OR_TEMP]);
+    if (IS_ERR(priv->rf[CODE_OR_TEMP]))
+        return PTR_ERR(priv->rf[CODE_OR_TEMP]);
+
+    priv->rf[MAIN_MEASURE_PERIOD] = devm_regmap_field_alloc(dev, priv->srot_map,
+ priv->fields[MAIN_MEASURE_PERIOD]);
+    if (IS_ERR(priv->rf[MAIN_MEASURE_PERIOD]))
+        return PTR_ERR(priv->rf[MAIN_MEASURE_PERIOD]);
+
+    regmap_field_write(priv->rf[TSENS_SW_RST], 0x1);
+
+    /* Update measure period to 2ms */
+    regmap_field_write(priv->rf[MAIN_MEASURE_PERIOD], 0x1);
+
+    /* Enable available sensors */
+    for (i = 0; i < priv->num_sensors; i++)
+        val |= 1 << priv->sensor[i].hw_id;
+
+    regmap_field_write(priv->rf[SENSOR_EN], val);
+
+    /* Real temperature format */
+    regmap_field_write(priv->rf[CODE_OR_TEMP], 0x1);
+
+    regmap_field_write(priv->rf[TSENS_SW_RST], 0x0);
+
+    /* Enable TSENS */
+    regmap_field_write(priv->rf[TSENS_EN], 0x1);
+
+    return 0;
+}
+
  static const struct tsens_ops ops_generic_v2 = {
      .init        = init_common,
      .get_temp    = get_temp_tsens_valid,
diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
index 98c356acfe98..5d2ad3b155ec 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -974,7 +974,7 @@ int __init init_common(struct tsens_priv *priv)
      ret = regmap_field_read(priv->rf[TSENS_EN], &enabled);
      if (ret)
          goto err_put_device;
-    if (!enabled) {
+    if (!enabled && !VER_2_X_NO_RPM) {

You probably meant something else here. `!const' is going to evaluate to false.

Sorry, my bad. Missed to compare it with the version. Will update in the next path.

--
Thanks,
Praveenkumar

          dev_err(dev, "%s: device not enabled\n", __func__);
          ret = -ENODEV;
          goto err_put_device;
diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
index 2805de1c6827..b2e8f0f2b466 100644
--- a/drivers/thermal/qcom/tsens.h
+++ b/drivers/thermal/qcom/tsens.h
@@ -35,6 +35,7 @@ enum tsens_ver {
      VER_0_1,
      VER_1_X,
      VER_2_X,
+    VER_2_X_NO_RPM,
  };
    enum tsens_irq_type {
@@ -168,6 +169,8 @@ enum regfield_ids {
      TSENS_SW_RST,
      SENSOR_EN,
      CODE_OR_TEMP,
+    /* MEASURE_PERIOD */
+    MAIN_MEASURE_PERIOD,
        /* ----- TM ------ */
      /* TRDY */




[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [Linux for Sparc]     [IETF Annouce]     [Security]     [Bugtraq]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]

  Powered by Linux