imx: power optimization for i.mx8qm
Current implementation of i.MX8QM power management related
features does NOT optimize power number, all system resources
like CCI, DDR, and A cluster etc. are kept in STBY mode (powered
ON) when system suspend or CPU hotplug.
To lower the power number, OFF mode should be adopted for those
system resources whenever they can be OFF, A cluster will be OFF
if the CPUs in the cluster are all off line, DDR/MU/DB can be OFF
if system suspend, IRQ steer can be OFF if the wakeup source is
belonged to system controller partition, so wakeup source runtime
check is used to determine if IRQ steer can be OFF before system
suspend.
If resources are powered off for suspend, they should be restored
properly after system resume.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
diff --git a/plat/imx/common/imx8_psci.c b/plat/imx/common/imx8_psci.c
index 588d8b4..91d3370 100644
--- a/plat/imx/common/imx8_psci.c
+++ b/plat/imx/common/imx8_psci.c
@@ -32,8 +32,22 @@
int imx_validate_power_state(unsigned int power_state,
psci_power_state_t *req_state)
{
- /* TODO */
- return PSCI_E_INVALID_PARAMS;
+ int pwr_lvl = psci_get_pstate_pwrlvl(power_state);
+ int pwr_type = psci_get_pstate_type(power_state);
+ int state_id = psci_get_pstate_id(power_state);
+
+ if (pwr_lvl > PLAT_MAX_PWR_LVL)
+ return PSCI_E_INVALID_PARAMS;
+
+ if (pwr_type == PSTATE_TYPE_POWERDOWN) {
+ req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE;
+ if (!state_id)
+ req_state->pwr_domain_state[MPIDR_AFFLVL1] = PLAT_MAX_RET_STATE;
+ else
+ req_state->pwr_domain_state[MPIDR_AFFLVL1] = PLAT_MAX_OFF_STATE;
+ }
+
+ return PSCI_E_SUCCESS;
}
void imx_get_sys_suspend_power_state(psci_power_state_t *req_state)
diff --git a/plat/imx/common/include/plat_imx8.h b/plat/imx/common/include/plat_imx8.h
index 952ad53..be99b97 100644
--- a/plat/imx/common/include/plat_imx8.h
+++ b/plat/imx/common/include/plat_imx8.h
@@ -10,6 +10,11 @@
#include <drivers/arm/gicv3.h>
#include <lib/psci/psci.h>
+struct plat_gic_ctx {
+ gicv3_redist_ctx_t rdist_ctx[PLATFORM_CORE_COUNT];
+ gicv3_dist_ctx_t dist_ctx;
+};
+
unsigned int plat_calc_core_pos(uint64_t mpidr);
void imx_mailbox_init(uintptr_t base_addr);
void plat_gic_driver_init(void);
@@ -24,5 +29,7 @@
psci_power_state_t *req_state);
void imx_get_sys_suspend_power_state(psci_power_state_t *req_state);
bool imx_is_wakeup_src_irqsteer(void);
+void plat_gic_save(unsigned int proc_num, struct plat_gic_ctx *ctx);
+void plat_gic_restore(unsigned int proc_num, struct plat_gic_ctx *ctx);
#endif /* PLAT_IMX8_H */
diff --git a/plat/imx/common/plat_imx8_gic.c b/plat/imx/common/plat_imx8_gic.c
index aec0b6c..27c525b 100644
--- a/plat/imx/common/plat_imx8_gic.c
+++ b/plat/imx/common/plat_imx8_gic.c
@@ -73,3 +73,19 @@
{
gicv3_rdistif_init(plat_my_core_pos());
}
+
+void plat_gic_save(unsigned int proc_num, struct plat_gic_ctx *ctx)
+{
+ /* save the gic rdist/dist context */
+ for (int i = 0; i < PLATFORM_CORE_COUNT; i++)
+ gicv3_rdistif_save(i, &ctx->rdist_ctx[i]);
+ gicv3_distif_save(&ctx->dist_ctx);
+}
+
+void plat_gic_restore(unsigned int proc_num, struct plat_gic_ctx *ctx)
+{
+ /* restore the gic rdist/dist context */
+ gicv3_distif_init_restore(&ctx->dist_ctx);
+ for (int i = 0; i < PLATFORM_CORE_COUNT; i++)
+ gicv3_rdistif_init_restore(i, &ctx->rdist_ctx[i]);
+}
diff --git a/plat/imx/common/sci/imx8_mu.c b/plat/imx/common/sci/imx8_mu.c
index 26d9bdf..66e956d 100644
--- a/plat/imx/common/sci/imx8_mu.c
+++ b/plat/imx/common/sci/imx8_mu.c
@@ -8,6 +8,21 @@
#include "imx8_mu.h"
+void MU_Resume(uint32_t base)
+{
+ uint32_t reg, i;
+
+ reg = mmio_read_32(base + MU_ACR_OFFSET1);
+ /* Clear GIEn, RIEn, TIEn, GIRn and ABFn. */
+ reg &= ~(MU_CR_GIEn_MASK1 | MU_CR_RIEn_MASK1 | MU_CR_TIEn_MASK1
+ | MU_CR_GIRn_MASK1 | MU_CR_Fn_MASK1);
+ mmio_write_32(base + MU_ACR_OFFSET1, reg);
+
+ /* Enable all RX interrupts */
+ for (i = 0; i < MU_RR_COUNT; i++)
+ MU_EnableRxFullInt(base, i);
+}
+
void MU_EnableRxFullInt(uint32_t base, uint32_t index)
{
uint32_t reg = mmio_read_32(base + MU_ACR_OFFSET1);
diff --git a/plat/imx/common/sci/imx8_mu.h b/plat/imx/common/sci/imx8_mu.h
index 8c78877..edcac7b 100644
--- a/plat/imx/common/sci/imx8_mu.h
+++ b/plat/imx/common/sci/imx8_mu.h
@@ -33,3 +33,4 @@
void MU_ReceiveMsg(uint32_t base, uint32_t regIndex, uint32_t *msg);
void MU_EnableGeneralInt(uint32_t base, uint32_t index);
void MU_EnableRxFullInt(uint32_t base, uint32_t index);
+void MU_Resume(uint32_t base);