plat/arm: css: Turn ON/OFF redistributor in sync with GIC CPU interface ON/OFF
Turn ON/OFF GIC redistributor in sync with GIC CPU interface ON/OFF.
Issue :
The Linux prompt hangs when all the cores in a cluster are turned OFF
and we try to turn ON a core in that cluster. Previously when TF-A turns
ON a core, TF-A first turns ON the redistributor followed by the core.
This did not match the flow when turning OFF a core, as TF-A did not
turn OFF redistributor when the corresponding core[s] are disabled.
This hang is resolved by disabling redistributor as cores are disabled,
keeping them in sync.
Signed-off-by: Jagadeesh Ujja <jagadeesh.ujja@arm.com>
Change-Id: Ifd04fdcfd47b45e00f874f15b098471883d023f0
diff --git a/plat/arm/css/common/css_pm.c b/plat/arm/css/common/css_pm.c
index 8e74526..926b8ec 100644
--- a/plat/arm/css/common/css_pm.c
+++ b/plat/arm/css/common/css_pm.c
@@ -123,6 +123,9 @@
/* Prevent interrupts from spuriously waking up this cpu */
plat_arm_gic_cpuif_disable();
+ /* Turn redistributor off */
+ plat_arm_gic_redistif_off();
+
/* Cluster is to be turned off, so disable coherency */
if (CSS_CLUSTER_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF) {
plat_arm_interconnect_exit_coherency();