plat/arm: css: Convert CSS_SYSTEM_PWR_STATE from macro to inline function

This is to fix a number of Coverity Scan DEADCODE defects, CID numbers
listed below, as reported from
https://scan.coverity.com/projects/arm-software-arm-trusted-firmware

CID 267023
CID 267022
CID 267020

Change-Id: I2963a799b210149e84ccab5c5b9082267ddfe337
Signed-off-by: Nariman Poushin <nariman.poushin@linaro.org>

include/plat/arm/css/common/css_pm.h

@@ -17,9 +17,15 @@
 /* Macros to read the CSS power domain state */
 #define CSS_CORE_PWR_STATE(state)	(state)->pwr_domain_state[ARM_PWR_LVL0]
 #define CSS_CLUSTER_PWR_STATE(state)	(state)->pwr_domain_state[ARM_PWR_LVL1]
-#define CSS_SYSTEM_PWR_STATE(state)	\
-			((PLAT_MAX_PWR_LVL == CSS_SYSTEM_PWR_DMN_LVL) ?\
-			(state)->pwr_domain_state[CSS_SYSTEM_PWR_DMN_LVL] : 0)
+
+static inline unsigned int css_system_pwr_state(const psci_power_state_t *state)
+{
+#if (PLAT_MAX_PWR_LVL == CSS_SYSTEM_PWR_DMN_LVL)
+	return state->pwr_domain_state[CSS_SYSTEM_PWR_DMN_LVL];
+#else
+	return 0;
+#endif
+}
 
 int css_pwr_domain_on(u_register_t mpidr);
 void css_pwr_domain_on_finish(const psci_power_state_t *target_state);

plat/arm/css/common/css_pm.c

@@ -96,7 +96,7 @@ static void css_pwr_domain_on_finisher_common(
 void css_pwr_domain_on_finish(const psci_power_state_t *target_state)
 {
 	/* Assert that the system power domain need not be initialized */
-	assert(CSS_SYSTEM_PWR_STATE(target_state) == ARM_LOCAL_STATE_RUN);
+	assert(css_system_pwr_state(target_state) == ARM_LOCAL_STATE_RUN);
 
 	/* Program the gic per-cpu distributor or re-distributor interface */
 	plat_arm_gic_pcpu_init();
@@ -149,7 +149,7 @@ void css_pwr_domain_suspend(const psci_power_state_t *target_state)
 	css_power_down_common(target_state);
 
 	/* Perform system domain state saving if issuing system suspend */
-	if (CSS_SYSTEM_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF) {
+	if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF) {
 		arm_system_pwr_domain_save();
 
 		/* Power off the Redistributor after having saved its context */
@@ -174,7 +174,7 @@ void css_pwr_domain_suspend_finish(
 		return;
 
 	/* Perform system domain restore if woken up from system suspend */
-	if (CSS_SYSTEM_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF)
+	if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF)
 		/*
 		 * At this point, the Distributor must be powered on to be ready
 		 * to have its state restored. The Redistributor will be powered

plat/arm/css/drivers/scp/css_pm_scmi.c

@@ -87,7 +87,7 @@ void css_scp_suspend(const struct psci_power_state *target_state)
 						ARM_LOCAL_STATE_OFF);
 
 	/* Check if power down at system power domain level is requested */
-	if (CSS_SYSTEM_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF) {
+	if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF) {
 		/* Issue SCMI command for SYSTEM_SUSPEND */
 		ret = scmi_sys_pwr_state_set(scmi_handle,
 				SCMI_SYS_PWR_FORCEFUL_REQ,

plat/arm/css/drivers/scp/css_pm_scpi.c

@@ -25,7 +25,7 @@ void css_scp_suspend(const struct psci_power_state *target_state)
 	uint32_t system_state = scpi_power_on;
 
 	/* Check if power down at system power domain level is requested */
-	if (CSS_SYSTEM_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF)
+	if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF)
 		system_state = scpi_power_retention;
 
 	/* Cluster is to be turned off, so disable coherency */