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feat(tc): add save/restore DSU PMU register support

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This patch adds support for preserving DSU PMU registers
over a power cycle in TC platform.

These PMU registers need to be manually saved/restored
because they are part of cluster power domain and OS
doesn't know when DSU is powered OFF.

Change-Id: Ife9573f205d99d092039cb95674e7434bb5f9239
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
This commit is contained in:
Arvind Ram Prakash 2024-05-07 10:33:46 -05:00
parent f99a69c386
commit b87d7ab13f
2 changed files with 15 additions and 2 deletions
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4
plat/arm/board/tc/platform.mk
View file

@ -68,6 +68,9 @@ $(eval $(call add_defines, \
CSS_LOAD_SCP_IMAGES := 1 CSS_LOAD_SCP_IMAGES := 1
# Save DSU PMU registers on cluster off and restore them on cluster on
PRESERVE_DSU_PMU_REGS := 1
# Include GICv3 driver files # Include GICv3 driver files
include drivers/arm/gic/v3/gicv3.mk include drivers/arm/gic/v3/gicv3.mk
@ -128,6 +131,7 @@ BL31_SOURCES += ${INTERCONNECT_SOURCES} \
${TC_BASE}/tc_topology.c \ ${TC_BASE}/tc_topology.c \
lib/fconf/fconf.c \ lib/fconf/fconf.c \
lib/fconf/fconf_dyn_cfg_getter.c \ lib/fconf/fconf_dyn_cfg_getter.c \
drivers/arm/css/dsu/dsu.c \
drivers/cfi/v2m/v2m_flash.c \ drivers/cfi/v2m/v2m_flash.c \
lib/utils/mem_region.c \ lib/utils/mem_region.c \
plat/arm/common/arm_nor_psci_mem_protect.c \ plat/arm/common/arm_nor_psci_mem_protect.c \

13
plat/arm/css/common/css_pm.c
View file

@ -12,6 +12,7 @@
#include <bl31/interrupt_mgmt.h> #include <bl31/interrupt_mgmt.h>
#include <common/debug.h> #include <common/debug.h>
#include <drivers/arm/css/css_scp.h> #include <drivers/arm/css/css_scp.h>
#include <drivers/arm/css/dsu.h>
#include <lib/cassert.h> #include <lib/cassert.h>
#include <plat/arm/common/plat_arm.h> #include <plat/arm/common/plat_arm.h>
@ -82,9 +83,13 @@ static void css_pwr_domain_on_finisher_common(
* Perform the common cluster specific operations i.e enable coherency * Perform the common cluster specific operations i.e enable coherency
* if this cluster was off. * if this cluster was off.
*/ */
if (CSS_CLUSTER_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF) if (CSS_CLUSTER_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF) {
#if PRESERVE_DSU_PMU_REGS
cluster_on_dsu_pmu_context_restore();
#endif
plat_arm_interconnect_enter_coherency(); plat_arm_interconnect_enter_coherency();
} }
}
/******************************************************************************* /*******************************************************************************
* Handler called when a power level has just been powered on after * Handler called when a power level has just been powered on after
@ -131,9 +136,13 @@ static void css_power_down_common(const psci_power_state_t *target_state)
plat_arm_gic_cpuif_disable(); plat_arm_gic_cpuif_disable();
/* Cluster is to be turned off, so disable coherency */ /* 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) {
#if PRESERVE_DSU_PMU_REGS
cluster_off_dsu_pmu_context_save();
#endif
plat_arm_interconnect_exit_coherency(); plat_arm_interconnect_exit_coherency();
} }
}
/******************************************************************************* /*******************************************************************************
* Handler called when a power domain is about to be turned off. The * Handler called when a power domain is about to be turned off. The