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3a2b51993d
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>
62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
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* Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <stdbool.h>
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#include <arch.h>
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#include <arch_helpers.h>
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#include <common/debug.h>
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#include <plat_imx8.h>
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#include <sci/sci.h>
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void __dead2 imx_system_off(void)
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{
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sc_pm_set_sys_power_mode(ipc_handle, SC_PM_PW_MODE_OFF);
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wfi();
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ERROR("power off failed.\n");
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panic();
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}
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void __dead2 imx_system_reset(void)
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{
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sc_pm_reset(ipc_handle, SC_PM_RESET_TYPE_BOARD);
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wfi();
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ERROR("system reset failed.\n");
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panic();
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}
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int imx_validate_power_state(unsigned int power_state,
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psci_power_state_t *req_state)
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{
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int pwr_lvl = psci_get_pstate_pwrlvl(power_state);
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int pwr_type = psci_get_pstate_type(power_state);
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int state_id = psci_get_pstate_id(power_state);
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if (pwr_lvl > PLAT_MAX_PWR_LVL)
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return PSCI_E_INVALID_PARAMS;
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if (pwr_type == PSTATE_TYPE_POWERDOWN) {
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req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE;
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if (!state_id)
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req_state->pwr_domain_state[MPIDR_AFFLVL1] = PLAT_MAX_RET_STATE;
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else
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req_state->pwr_domain_state[MPIDR_AFFLVL1] = PLAT_MAX_OFF_STATE;
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}
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return PSCI_E_SUCCESS;
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}
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void imx_get_sys_suspend_power_state(psci_power_state_t *req_state)
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{
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unsigned int i;
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/* CPU & cluster off, system in retention */
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for (i = MPIDR_AFFLVL0; i < PLAT_MAX_PWR_LVL; i++)
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req_state->pwr_domain_state[i] = PLAT_MAX_OFF_STATE;
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req_state->pwr_domain_state[PLAT_MAX_PWR_LVL] = PLAT_MAX_RET_STATE;
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}
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