[linux-nvidia-6.18] CPPC updates and bug fixes

Documentation/ABI/testing/sysfs-devices-system-cpu

@@ -327,32 +327,6 @@ Description:	Energy performance preference
 
 		This file is only present if the cppc-cpufreq driver is in use.
 
-What:		/sys/devices/system/cpu/cpuX/cpufreq/min_perf
-Date:		February 2026
-Contact:	linux-pm@vger.kernel.org
-Description:	Minimum Performance Frequency
-
-		Read/write a frequency value in kHz from/to this file. This
-		file sets the minimum performance level (as frequency) at
-		which the platform may run. The frequency value is internally
-		converted to a performance value and must be in the range
-		[cpuinfo_min_freq, cpuinfo_max_freq], inclusive.
-
-		This file is only present if the cppc-cpufreq driver is in use.
-
-What:		/sys/devices/system/cpu/cpuX/cpufreq/max_perf
-Date:		February 2026
-Contact:	linux-pm@vger.kernel.org
-Description:	Maximum Performance Frequency
-
-		Read/write a frequency value in kHz from/to this file. This
-		file sets the maximum performance level (as frequency) at
-		which the platform may run. The frequency value is internally
-		converted to a performance value and must be in the range
-		[cpuinfo_min_freq, cpuinfo_max_freq], inclusive.
-
-		This file is only present if the cppc-cpufreq driver is in use.
-
 What:		/sys/devices/system/cpu/cpuX/cpufreq/perf_limited
 Date:		February 2026
 Contact:	linux-pm@vger.kernel.org

Documentation/admin-guide/kernel-parameters.txt

@@ -943,6 +943,19 @@
 			policy to use. This governor must be registered in the
 			kernel before the cpufreq driver probes.
 
+	cppc_cpufreq.auto_sel_mode=
+			[CPU_FREQ] Enable ACPI CPPC autonomous performance
+			selection. When enabled, hardware automatically adjusts
+			CPU frequency on all CPUs based on workload demands.
+			In Autonomous mode, Energy Performance Preference (EPP)
+			hints guide hardware toward performance (0x0) or energy
+			efficiency (0xff).
+			Requires ACPI CPPC autonomous selection register support.
+			Format: <bool>
+			Default: 0 (disabled)
+			0: use cpufreq governors
+			1: enable if supported by hardware
+
 	cpu_init_udelay=N
 			[X86,EARLY] Delay for N microsec between assert and de-assert
 			of APIC INIT to start processors.  This delay occurs

Documentation/cpu-freq/cpu-drivers.rst

@@ -114,8 +114,14 @@ Then, the driver must fill in the following values:
 |policy->cur			    | The current operating frequency of   |
 |				    | this CPU (if appropriate)		   |
 +-----------------------------------+--------------------------------------+
-|policy->min,			    |					   |
-|policy->max,			    |					   |
+|policy->min			    | If set by the driver in ->init(),    |
+|				    | used as initial minimum frequency	   |
+|				    | QoS request.			   |
++-----------------------------------+--------------------------------------+
+|policy->max			    | If set by the driver in ->init(),    |
+|				    | used as initial maximum frequency	   |
+|				    | QoS request.			   |
++-----------------------------------+--------------------------------------+
 |policy->policy and, if necessary,  |					   |
 |policy->governor		    | must contain the "default policy" for|
 |				    | this CPU. A few moments later,       |