tools/power/x86/intel-speed-select: Skip uncore frequency update

JIRA: https://issues.redhat.com/browse/RHEL-110834

commit 51272ca
Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date:   Wed Apr 16 17:26:46 2025 -0700

    tools/power/x86/intel-speed-select: Skip uncore frequency update

    On SST PP level switch, skip adjusting the uncore frequency limit and
    allow the hardware to handle this on newer platforms.

    As newer generations of CPUs have changed the extended family identifier,
    use this identifier to exclude the update.

    Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

Signed-off-by: Steve Best <sbest@redhat.com>

Author: sfbest

tools/power/x86/intel-speed-select/isst-config.c

@@ -26,6 +26,7 @@ static FILE *outf;
 
 static int cpu_model;
 static int cpu_stepping;
+static int extended_family;
 
 #define MAX_CPUS_IN_ONE_REQ 512
 static short max_target_cpus;
@@ -143,13 +144,22 @@ int is_icx_platform(void)
 	return 0;
 }
 
+static int is_dmr_plus_platform(void)
+{
+	if (extended_family == 0x04)
+		return 1;
+
+	return 0;
+}
+
 static int update_cpu_model(void)
 {
 	unsigned int ebx, ecx, edx;
 	unsigned int fms, family;
 
 	__cpuid(1, fms, ebx, ecx, edx);
 	family = (fms >> 8) & 0xf;
+	extended_family = (fms >> 20) & 0x0f;
 	cpu_model = (fms >> 4) & 0xf;
 	if (family == 6 || family == 0xf)
 		cpu_model += ((fms >> 16) & 0xf) << 4;
@@ -1517,7 +1527,8 @@ static void set_tdp_level_for_cpu(struct isst_id *id, void *arg1, void *arg2, vo
 		usleep(2000);
 
 		/* Adjusting uncore freq */
-		isst_adjust_uncore_freq(id, tdp_level, &ctdp_level);
+		if (!is_dmr_plus_platform())
+			isst_adjust_uncore_freq(id, tdp_level, &ctdp_level);
 
 		fprintf(stderr, "Option is set to online/offline\n");
 		ctdp_level.core_cpumask_size =