occ: Skip setting cores to nominal frequency in P9

In P9, once OCC is up, it is supposed to setup the cores to nominal
frequency. So skip this step in OPAL.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

hw/occ.c

@@ -894,11 +894,14 @@ void occ_pstates_init(void)
 		return;
 	}
 
-	/* Setup host based pstates and set nominal frequency */
-	for_each_chip(chip) {
-		for_each_available_core_in_chip(c, chip->id) {
-			cpu_pstates_prepare_core(chip, c, pstate_nom);
-		}
+	/*
+	 * Setup host based pstates and set nominal frequency only in
+	 * P8.
+	 */
+	if (proc_gen == proc_gen_p8) {
+		for_each_chip(chip)
+			for_each_available_core_in_chip(c, chip->id)
+				cpu_pstates_prepare_core(chip, c, pstate_nom);
 	}
 
 	/* Add opal_poller to poll OCC throttle status of each chip */