From 5a33d25886af8f0996d901fcfc66674a3dc625db Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Thu, 25 Jul 2024 17:27:28 +0200
Subject: Add commandline parameter to set transition latency

---
 cputemp2maxfreq.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

(limited to 'cputemp2maxfreq.c')

diff --git a/cputemp2maxfreq.c b/cputemp2maxfreq.c
index 597f1e8..ad27062 100644
--- a/cputemp2maxfreq.c
+++ b/cputemp2maxfreq.c
@@ -29,6 +29,7 @@ struct s_config config={
  0,              // Don't overwrite CSV logfile
  NULL,           // File handler for CSV file
  0,              // Don't use unix timestamps in log outputs
+ -1,             // Transition latency, default to autodetect
 };
 struct s_cpudata cpudata;
 
@@ -38,11 +39,19 @@ void signal_handler(int signum)
  failsafe(0);
 }
 
+char *transition_latency_remarks[] = {
+ "Autodetected",
+ "Set via commandline",
+ "This seems low, consider setting it via -d"
+};
+
 int main(int argc,char **argv)
 {
  long int diff;
  long int newfreq;
 
+ char *transition_latency_remark;
+
  argparse(argc,argv);
  config.logger("%s version %s, buildtime %s %s",config.name,version(),__DATE__,__TIME__);
 
@@ -64,6 +73,12 @@ int main(int argc,char **argv)
   config.logger("Overwrite CSV log: %d",config.csvoverwrite);
  }
  config.logger("Use unix timestamps: %d",config.use_unixtime);
+ if (config.transition_latency<0)
+ {
+  config.logger("Transition latency: Autodetect");
+ } else {
+  config.logger("Transition latency: %d",config.transition_latency);
+ }
 
  if ((config.max_temp<VALID_TEMP_MIN) || (config.max_temp>VALID_TEMP_MAX))
  {
@@ -87,13 +102,21 @@ int main(int argc,char **argv)
  cpudata.min_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_min_freq");
  cpudata.max_freq=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq");
  cpudata.scale_max=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/scaling_max_freq");
- cpudata.transition_latency=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_transition_latency");
+ if (config.transition_latency<0)
+ {
+  transition_latency_remark=transition_latency_remarks[0];
+  cpudata.transition_latency=sysfs_read_long_int("/sys/devices/system/cpu/cpufreq/policy0/cpuinfo_transition_latency");
+  if (cpudata.transition_latency<1000)  transition_latency_remark=transition_latency_remarks[2];
+ } else {
+  transition_latency_remark=transition_latency_remarks[1];
+  cpudata.transition_latency=config.transition_latency;
+ }
 
  config.logger("CPU data:");
  config.logger("Minimum frequency: %ld",cpudata.min_freq);
  config.logger("Maximum frequency: %ld",cpudata.max_freq);
  config.logger("Scaling maximum frequency: %ld",cpudata.scale_max);
- config.logger("Transition Latency: %ld",cpudata.transition_latency);
+ config.logger("Transition Latency: %ld (%s)",cpudata.transition_latency,transition_latency_remark);
 
  if ((cpudata.min_freq<VALID_FREQ_MIN) || (cpudata.min_freq>VALID_FREQ_MAX) ||
      (cpudata.max_freq<VALID_FREQ_MIN) || (cpudata.max_freq>VALID_FREQ_MAX) ||
-- 
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