From bd331dbb839d7ee8b2d8abeb89d4fd650db58a9d Mon Sep 17 00:00:00 2001
From: PA4WDH
Date: Sat, 27 May 2023 10:47:05 +0200
Subject: Use CPU Transition Latency as checkdelay when setting new
 scaling_max_freq

---
 cputemp2maxfreq.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'cputemp2maxfreq.c')

diff --git a/cputemp2maxfreq.c b/cputemp2maxfreq.c
index 556e404..9600d13 100644
--- a/cputemp2maxfreq.c
+++ b/cputemp2maxfreq.c
@@ -85,15 +85,18 @@ 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");
 
  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);
 
  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) ||
-     (cpudata.scale_max<VALID_FREQ_MIN) || (cpudata.scale_max>VALID_FREQ_MAX))
+     (cpudata.scale_max<VALID_FREQ_MIN) || (cpudata.scale_max>VALID_FREQ_MAX) ||
+     (cpudata.transition_latency<VALID_TRANS_MIN) || (cpudata.transition_latency>VALID_TRANS_MAX))
  {
 // If we have to fail now, there's not much we can do because we have no data
   config.logger("Invalid CPU data, exiting");
@@ -166,7 +169,7 @@ int main(int argc,char **argv)
    config.logger("Increase scaling_max_freq to %ld",newfreq);
 
 // Set new value and validate
-   if (cpufreq_set_long_int("scaling_max_freq",newfreq,100)<0)
+   if (cpufreq_set_long_int("scaling_max_freq",newfreq,cpudata.transition_latency)<0)
    {
     config.logger("Failed to set scaling_max_freq, exiting");
     failsafe(1);
@@ -189,7 +192,7 @@ int main(int argc,char **argv)
    config.logger("Decrease scaling_max_freq to %ld",newfreq);
 
 // Set new value and validate
-   if (cpufreq_set_long_int("scaling_max_freq",newfreq,100)<0)
+   if (cpufreq_set_long_int("scaling_max_freq",newfreq,cpudata.transition_latency)<0)
    {
     config.logger("Failed to set scaling_max_freq, exiting");
     failsafe(1);
-- 
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