diff options
Diffstat (limited to 'plat/arm/board/fvp/fvp_pm.c')
| -rw-r--r-- | plat/arm/board/fvp/fvp_pm.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/plat/arm/board/fvp/fvp_pm.c b/plat/arm/board/fvp/fvp_pm.c index c47d83779..333d89288 100644 --- a/plat/arm/board/fvp/fvp_pm.c +++ b/plat/arm/board/fvp/fvp_pm.c @@ -64,6 +64,25 @@ static void fvp_cluster_pwrdwn_common(void) /* Disable coherency if this cluster is to be turned off */ fvp_interconnect_disable(); +#if HW_ASSISTED_COHERENCY + uint32_t reg; + + /* + * If we have determined this core to be the last man standing and we + * intend to power down the cluster proactively, we provide a hint to + * the power controller that cluster power is not required when all + * cores are powered down. + * Note that this is only an advisory to power controller and is supported + * by SoCs with DynamIQ Shared Units only. + */ + reg = read_clusterpwrdn(); + + /* Clear and set bit 0 : Cluster power not required */ + reg &= ~DSU_CLUSTER_PWR_MASK; + reg |= DSU_CLUSTER_PWR_OFF; + write_clusterpwrdn(reg); +#endif + /* Program the power controller to turn the cluster off */ fvp_pwrc_write_pcoffr(mpidr); } |