Merge pull request #907 from antonio-nino-diaz-arm/an/smc-ret0

tspd:FWU:Fix usage of SMC_RET0

bl1/bl1_fwu.c

@@ -109,7 +109,7 @@ register_t bl1_fwu_smc_handler(unsigned int smc_fid,
 		break;
 	}
 
-	SMC_RET0(handle);
+	SMC_RET1(handle, SMC_UNK);
 }
 
 /*******************************************************************************

include/lib/smcc.h

@@ -58,6 +58,7 @@
 
 #define SMC_64				1
 #define SMC_32				0
+#define SMC_OK				0
 #define SMC_UNK				0xffffffff
 #define SMC_TYPE_FAST			ULL(1)
 #define SMC_TYPE_STD			0

services/spd/tspd/tspd_main.c

@@ -631,7 +631,7 @@ uint64_t tspd_smc_handler(uint32_t smc_fid,
 
 		cm_el1_sysregs_context_restore(NON_SECURE);
 		cm_set_next_eret_context(NON_SECURE);
-		SMC_RET0(handle);
+		SMC_RET1(handle, SMC_OK);
 
 		/*
 		 * Request from non secure world to resume the preempted