temp_metrics: tmp006 calibration and fan loop updates

With the recent changes that have gone into the EC, the TMP006
calibration data is no longer present in the EC by default. Push it down
to the EC via the newly added ectool tmp006cal command.

Also added couple of changes to the fan loop:
- hand back fan control loop to the EC if none of the TMP006 sensors
  report valid temperatures.
- handle S0->S3->S0 transition where the EC sets the fan to 0 RPM.

BUG=chrome-os-partner:9193
TEST=run "ectool tmp006cal" command for sensors 0, 1, 2 and 3 and ensure
that they return non-zero calibration values.
BRANCH=none

Original-Change-Id: Iaf91216a4d3353f15489b39aba9acb34055551cf
Signed-off-by: Sameer Nanda <snanda@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/35469
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
(cherry picked from commit dd300b5baf1d6eff7f53b8a94c8574cfece52685)

Change-Id: I69549b360fb92bce5cc3326e635dbafd80ee011d
Reviewed-on: https://gerrit.chromium.org/gerrit/35694
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Sameer Nanda <snanda@chromium.org>

1 files changed, 74 insertions, 22 deletions

diff --git a/util/temp_metrics.conf b/util/temp_metrics.conf
index 303716ee79..5dba2c04bc 100644
--- a/util/temp_metrics.conf
+++ b/util/temp_metrics.conf
@@ -67,8 +67,11 @@ script
 
   get_sensor_temp() {
     s=$1
-    tempk=$(ectool temps $s | sed 's/[^0-9]//g')
-    tempc=$((tempk - $TEMP_OFFSET))
+    tempc=0
+    if out=$(ectool temps $s); then
+       tempk=$(echo $out | sed 's/[^0-9]//g')
+       tempc=$((tempk - $TEMP_OFFSET))
+    fi
     echo $tempc
   }
 
@@ -87,10 +90,33 @@ script
     echo $usb_c_object $pch_d_object $charger_d_object
   }
 
+  set_calibration_data() {
+    B0='-2.94e-5'
+    B1='-5.7e-7'
+    B2='4.63e-9'
+
+    USB_C_S0='3.648e-14'
+    PCH_D_S0='9.301e-14'
+    HINGE_C_S0='-11.000e-14'
+    CHARGER_D_S0='10.426e-14'
+
+    # Note that the sensor numbering is different between the ectool tmp006
+    # and temps/tempsinfo commands.
+    USB_C="0 $USB_C_S0 $B0 $B1 $B2"
+    PCH_D="1 $PCH_D_S0 $B0 $B1 $B2"
+    HINGE_C="2 $HINGE_C_S0 $B0 $B1 $B2"
+    CHARGER_D="3 $CHARGER_D_S0 $B0 $B1 $B2"
+
+    for i in "$USB_C" "$PCH_D" "$HINGE_C" "$CHARGER_D"; do
+      ectool tmp006cal $i
+    done
+  }
+
   max_skin_temp=0
-  sensor_temperatures=""
+  sensor_temperatures=
+
   get_max_skin_temp() {
-    sensor_temperatures=""
+    sensor_temperatures=
     max_skin_temp=0
     for i in $*; do
       t=$(get_sensor_temp $i)
@@ -220,7 +246,15 @@ script
     set_pkg_power_limit $pkg_power_limit
   }
 
-  fan_reset_thresholds() {
+  get_fan_rpm() {
+    echo $(ectool pwmgetfanrpm | sed 's/[^0-9]//g')
+  }
+
+  set_fan_rpm() {
+    ectool pwmsetfanrpm $1
+  }
+
+  reset_fan_thresholds() {
     temp_low1=105
     temp_low2=105
     temp_low3=105
@@ -242,47 +276,60 @@ script
 
     if [ $skin_temp -gt 48 ] || [ $skin_temp -gt $temp_low1 ]; then
       rpm=9300
-      fan_reset_thresholds
+      reset_fan_thresholds
       temp_low1=46
     elif [ $skin_temp -gt 44 ] || [ $skin_temp -gt $temp_low2 ]; then
       rpm=8000
-      fan_reset_thresholds
+      reset_fan_thresholds
       temp_low2=43
     elif [ $skin_temp -gt 42 ] || [ $skin_temp -gt $temp_low3 ]; then
       rpm=7000
-      fan_reset_thresholds
+      reset_fan_thresholds
       temp_low3=41
     elif [ $skin_temp -gt 40 ] || [ $skin_temp -gt $temp_low4 ]; then
       rpm=5500
-      fan_reset_thresholds
+      reset_fan_thresholds
       temp_low4=39
     elif [ $skin_temp -gt 38 ] || [ $skin_temp -gt $temp_low5 ]; then
       rpm=4000
-      fan_reset_thresholds
+      reset_fan_thresholds
       temp_low5=34
     elif [ $skin_temp -gt 33 ] || [ $skin_temp -gt $temp_low6 ]; then
       rpm=3000
-      fan_reset_thresholds
+      reset_fan_thresholds
       temp_low6=30
     else
       rpm=0
-      fan_reset_thresholds
+      reset_fan_thresholds
     fi
 
-    if [ $last_rpm -eq $rpm ]; then
+    # During S0->S3->S0 transitions, the EC sets the fan RPM to 0. This script
+    # isn't aware of such transitions. Read the current fan RPM again to see
+    # if it got set to 0. Note that comparing the current fan RPM against last
+    # requested RPM won't suffice since the actual fan RPM may not be exactly
+    # what was requested.
+    cur_rpm=$(get_fan_rpm)
+    if ([ $cur_rpm -ne 0 ] && [ $last_rpm -eq $rpm ]) || \
+       ([ $cur_rpm -eq 0 ] && [ $rpm -eq 0 ]); then
+      last_rpm=$rpm
       return
     fi
 
     log_message "Setting fan RPM (temps: $sensor_temperatures): $last_rpm -> $rpm"
 
     last_rpm=$rpm
-    ectool pwmsetfanrpm $rpm
+    set_fan_rpm $rpm
   }
 
   # Get list of sensors to monitor.
   sensor_list=$(get_sensor_list)
 
+  # Set sensor calibration data.
+  set_calibration_data
+
   loop_count=0
+  ec_fan_loop=0
+
   while true; do
     sleep 10
     loop_count=$(($loop_count + 1))
@@ -291,15 +338,20 @@ script
     get_max_skin_temp $sensor_list
 
     if [ $max_skin_temp -eq 0 ]; then
-      # TODO (snanda): use PECI temperature as a fallback.
-      log_message "Invalid max skin temp"
-    fi
-
-    # Run the fan loop every 10 seconds.
-    fan_loop $max_skin_temp
+      if [ $ec_fan_loop -eq 0 ]; then
+        log_message "Invalid max skin temp. Switching to EC fan loop."
+        ectool autofanctrl
+        ec_fan_loop=1
+        last_rpm=10
+      fi
+    else
+      # Run the fan loop.
+      fan_loop $max_skin_temp
+      ec_fan_loop=0
 
-    # Run the thermal loop every 10 seconds.
-    thermal_loop $max_skin_temp
+      # Run the thermal loop.
+      thermal_loop $max_skin_temp
+    fi
 
     # Report the metrics once every 30 seconds.
     if [ $loop_count -lt 3 ]; then