diff options
Diffstat (limited to 'plat/arm/css/common/css_pm.c')
| -rw-r--r-- | plat/arm/css/common/css_pm.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/plat/arm/css/common/css_pm.c b/plat/arm/css/common/css_pm.c index 01c674f82..926b8ec7c 100644 --- a/plat/arm/css/common/css_pm.c +++ b/plat/arm/css/common/css_pm.c @@ -1,11 +1,10 @@ /* - * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include <assert.h> -#include <errno.h> #include <platform_def.h> @@ -15,7 +14,6 @@ #include <lib/cassert.h> #include <plat/arm/common/plat_arm.h> #include <plat/arm/css/common/css_pm.h> -#include <plat/common/platform.h> /* Allow CSS platforms to override `plat_arm_psci_pm_ops` */ #pragma weak plat_arm_psci_pm_ops @@ -125,9 +123,32 @@ static void css_power_down_common(const psci_power_state_t *target_state) /* 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) + if (CSS_CLUSTER_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF) { plat_arm_interconnect_exit_coherency(); + +#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 + } } /******************************************************************************* |