powerpc/pseries: Cleanup best_energy_hcall detection

[firefly-linux-kernel-4.4.55.git] / arch / powerpc / platforms / pseries / pseries_energy.c

diff --git a/arch/powerpc/platforms/pseries/pseries_energy.c b/arch/powerpc/platforms/pseries/pseries_energy.c
index af281dce510af14246a96be7b83178456cfc7c3b..a91e6dadda2cb120bb81b46695cbce4735e67973 100644 (file)
--- a/arch/powerpc/platforms/pseries/pseries_energy.c
+++ b/arch/powerpc/platforms/pseries/pseries_energy.c
@@ -21,6 +21,7 @@
 #include <asm/cputhreads.h>
 #include <asm/page.h>
 #include <asm/hvcall.h>
+#include <asm/firmware.h>
 
 
 #define MODULE_VERS "1.0"
@@ -32,40 +33,6 @@ static int sysfs_entries;
 
 /* Helper routines */
 
-/*
- * Routine to detect firmware support for hcall
- * return 1 if H_BEST_ENERGY is supported
- * else return 0
- */
-
-static int check_for_h_best_energy(void)
-{
-       struct device_node *rtas = NULL;
-       const char *hypertas, *s;
-       int length;
-       int rc = 0;
-
-       rtas = of_find_node_by_path("/rtas");
-       if (!rtas)
-               return 0;
-
-       hypertas = of_get_property(rtas, "ibm,hypertas-functions", &length);
-       if (!hypertas) {
-               of_node_put(rtas);
-               return 0;
-       }
-
-       /* hypertas will have list of strings with hcall names */
-       for (s = hypertas; s < hypertas + length; s += strlen(s) + 1) {
-               if (!strncmp("hcall-best-energy-1", s, 19)) {
-                       rc = 1; /* Found the string */
-                       break;
-               }
-       }
-       of_node_put(rtas);
-       return rc;
-}
-
 /* Helper Routines to convert between drc_index to cpu numbers */
 
 static u32 cpu_to_drc_index(int cpu)
@@ -262,7 +229,7 @@ static int __init pseries_energy_init(void)
        int cpu, err;
        struct device *cpu_dev;
 
-       if (!check_for_h_best_energy()) {
+       if (!firmware_has_feature(FW_FEATURE_BEST_ENERGY)) {
                printk(KERN_INFO "Hypercall H_BEST_ENERGY not supported\n");
                return 0;
        }