diff options
Diffstat (limited to 'plat/arm/board/fvp/fvp_pm.c')
| -rw-r--r-- | plat/arm/board/fvp/fvp_pm.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/plat/arm/board/fvp/fvp_pm.c b/plat/arm/board/fvp/fvp_pm.c index 0a62543fa..333d89288 100644 --- a/plat/arm/board/fvp/fvp_pm.c +++ b/plat/arm/board/fvp/fvp_pm.c @@ -1,11 +1,10 @@ /* - * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include <assert.h> -#include <errno.h> #include <arch_helpers.h> #include <common/debug.h> @@ -16,7 +15,6 @@ #include <lib/psci/psci.h> #include <plat/arm/common/arm_config.h> #include <plat/arm/common/plat_arm.h> -#include <plat/common/platform.h> #include <platform_def.h> #include "fvp_private.h" @@ -66,6 +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); } |