diff options
Diffstat (limited to 'drivers/bus/mhi/core/pm.c')
| -rw-r--r-- | drivers/bus/mhi/core/pm.c | 1271 |
1 files changed, 0 insertions, 1271 deletions
diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c deleted file mode 100644 index 547e6e769546..000000000000 --- a/drivers/bus/mhi/core/pm.c +++ /dev/null @@ -1,1271 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved. - * - */ - -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/dma-direction.h> -#include <linux/dma-mapping.h> -#include <linux/interrupt.h> -#include <linux/list.h> -#include <linux/mhi.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/wait.h> -#include "internal.h" - -/* - * Not all MHI state transitions are synchronous. Transitions like Linkdown, - * SYS_ERR, and shutdown can happen anytime asynchronously. This function will - * transition to a new state only if we're allowed to. - * - * Priority increases as we go down. For instance, from any state in L0, the - * transition can be made to states in L1, L2 and L3. A notable exception to - * this rule is state DISABLE. From DISABLE state we can only transition to - * POR state. Also, while in L2 state, user cannot jump back to previous - * L1 or L0 states. - * - * Valid transitions: - * L0: DISABLE <--> POR - * POR <--> POR - * POR -> M0 -> M2 --> M0 - * POR -> FW_DL_ERR - * FW_DL_ERR <--> FW_DL_ERR - * M0 <--> M0 - * M0 -> FW_DL_ERR - * M0 -> M3_ENTER -> M3 -> M3_EXIT --> M0 - * L1: SYS_ERR_DETECT -> SYS_ERR_PROCESS --> POR - * L2: SHUTDOWN_PROCESS -> LD_ERR_FATAL_DETECT - * SHUTDOWN_PROCESS -> DISABLE - * L3: LD_ERR_FATAL_DETECT <--> LD_ERR_FATAL_DETECT - * LD_ERR_FATAL_DETECT -> DISABLE - */ -static struct mhi_pm_transitions const dev_state_transitions[] = { - /* L0 States */ - { - MHI_PM_DISABLE, - MHI_PM_POR - }, - { - MHI_PM_POR, - MHI_PM_POR | MHI_PM_DISABLE | MHI_PM_M0 | - MHI_PM_SYS_ERR_DETECT | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT | MHI_PM_FW_DL_ERR - }, - { - MHI_PM_M0, - MHI_PM_M0 | MHI_PM_M2 | MHI_PM_M3_ENTER | - MHI_PM_SYS_ERR_DETECT | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT | MHI_PM_FW_DL_ERR - }, - { - MHI_PM_M2, - MHI_PM_M0 | MHI_PM_SYS_ERR_DETECT | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT - }, - { - MHI_PM_M3_ENTER, - MHI_PM_M3 | MHI_PM_SYS_ERR_DETECT | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT - }, - { - MHI_PM_M3, - MHI_PM_M3_EXIT | MHI_PM_SYS_ERR_DETECT | - MHI_PM_LD_ERR_FATAL_DETECT - }, - { - MHI_PM_M3_EXIT, - MHI_PM_M0 | MHI_PM_SYS_ERR_DETECT | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT - }, - { - MHI_PM_FW_DL_ERR, - MHI_PM_FW_DL_ERR | MHI_PM_SYS_ERR_DETECT | - MHI_PM_SHUTDOWN_PROCESS | MHI_PM_LD_ERR_FATAL_DETECT - }, - /* L1 States */ - { - MHI_PM_SYS_ERR_DETECT, - MHI_PM_SYS_ERR_PROCESS | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT - }, - { - MHI_PM_SYS_ERR_PROCESS, - MHI_PM_POR | MHI_PM_SHUTDOWN_PROCESS | - MHI_PM_LD_ERR_FATAL_DETECT - }, - /* L2 States */ - { - MHI_PM_SHUTDOWN_PROCESS, - MHI_PM_DISABLE | MHI_PM_LD_ERR_FATAL_DETECT - }, - /* L3 States */ - { - MHI_PM_LD_ERR_FATAL_DETECT, - MHI_PM_LD_ERR_FATAL_DETECT | MHI_PM_DISABLE - }, -}; - -enum mhi_pm_state __must_check mhi_tryset_pm_state(struct mhi_controller *mhi_cntrl, - enum mhi_pm_state state) -{ - unsigned long cur_state = mhi_cntrl->pm_state; - int index = find_last_bit(&cur_state, 32); - - if (unlikely(index >= ARRAY_SIZE(dev_state_transitions))) - return cur_state; - - if (unlikely(dev_state_transitions[index].from_state != cur_state)) - return cur_state; - - if (unlikely(!(dev_state_transitions[index].to_states & state))) - return cur_state; - - mhi_cntrl->pm_state = state; - return mhi_cntrl->pm_state; -} - -void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl, enum mhi_state state) -{ - if (state == MHI_STATE_RESET) { - mhi_write_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL, - MHICTRL_RESET_MASK, MHICTRL_RESET_SHIFT, 1); - } else { - mhi_write_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL, - MHICTRL_MHISTATE_MASK, - MHICTRL_MHISTATE_SHIFT, state); - } -} - -/* NOP for backward compatibility, host allowed to ring DB in M2 state */ -static void mhi_toggle_dev_wake_nop(struct mhi_controller *mhi_cntrl) -{ -} - -static void mhi_toggle_dev_wake(struct mhi_controller *mhi_cntrl) -{ - mhi_cntrl->wake_get(mhi_cntrl, false); - mhi_cntrl->wake_put(mhi_cntrl, true); -} - -/* Handle device ready state transition */ -int mhi_ready_state_transition(struct mhi_controller *mhi_cntrl) -{ - struct mhi_event *mhi_event; - enum mhi_pm_state cur_state; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - u32 interval_us = 25000; /* poll register field every 25 milliseconds */ - int ret, i; - - /* Check if device entered error state */ - if (MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state)) { - dev_err(dev, "Device link is not accessible\n"); - return -EIO; - } - - /* Wait for RESET to be cleared and READY bit to be set by the device */ - ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL, - MHICTRL_RESET_MASK, MHICTRL_RESET_SHIFT, 0, - interval_us); - if (ret) { - dev_err(dev, "Device failed to clear MHI Reset\n"); - return ret; - } - - ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHISTATUS, - MHISTATUS_READY_MASK, MHISTATUS_READY_SHIFT, 1, - interval_us); - if (ret) { - dev_err(dev, "Device failed to enter MHI Ready\n"); - return ret; - } - - dev_dbg(dev, "Device in READY State\n"); - write_lock_irq(&mhi_cntrl->pm_lock); - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_POR); - mhi_cntrl->dev_state = MHI_STATE_READY; - write_unlock_irq(&mhi_cntrl->pm_lock); - - if (cur_state != MHI_PM_POR) { - dev_err(dev, "Error moving to state %s from %s\n", - to_mhi_pm_state_str(MHI_PM_POR), - to_mhi_pm_state_str(cur_state)); - return -EIO; - } - - read_lock_bh(&mhi_cntrl->pm_lock); - if (!MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) { - dev_err(dev, "Device registers not accessible\n"); - goto error_mmio; - } - - /* Configure MMIO registers */ - ret = mhi_init_mmio(mhi_cntrl); - if (ret) { - dev_err(dev, "Error configuring MMIO registers\n"); - goto error_mmio; - } - - /* Add elements to all SW event rings */ - mhi_event = mhi_cntrl->mhi_event; - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { - struct mhi_ring *ring = &mhi_event->ring; - - /* Skip if this is an offload or HW event */ - if (mhi_event->offload_ev || mhi_event->hw_ring) - continue; - - ring->wp = ring->base + ring->len - ring->el_size; - *ring->ctxt_wp = ring->iommu_base + ring->len - ring->el_size; - /* Update all cores */ - smp_wmb(); - - /* Ring the event ring db */ - spin_lock_irq(&mhi_event->lock); - mhi_ring_er_db(mhi_event); - spin_unlock_irq(&mhi_event->lock); - } - - /* Set MHI to M0 state */ - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_M0); - read_unlock_bh(&mhi_cntrl->pm_lock); - - return 0; - -error_mmio: - read_unlock_bh(&mhi_cntrl->pm_lock); - - return -EIO; -} - -int mhi_pm_m0_transition(struct mhi_controller *mhi_cntrl) -{ - enum mhi_pm_state cur_state; - struct mhi_chan *mhi_chan; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - int i; - - write_lock_irq(&mhi_cntrl->pm_lock); - mhi_cntrl->dev_state = MHI_STATE_M0; - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_M0); - write_unlock_irq(&mhi_cntrl->pm_lock); - if (unlikely(cur_state != MHI_PM_M0)) { - dev_err(dev, "Unable to transition to M0 state\n"); - return -EIO; - } - mhi_cntrl->M0++; - - /* Wake up the device */ - read_lock_bh(&mhi_cntrl->pm_lock); - mhi_cntrl->wake_get(mhi_cntrl, true); - - /* Ring all event rings and CMD ring only if we're in mission mode */ - if (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) { - struct mhi_event *mhi_event = mhi_cntrl->mhi_event; - struct mhi_cmd *mhi_cmd = - &mhi_cntrl->mhi_cmd[PRIMARY_CMD_RING]; - - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { - if (mhi_event->offload_ev) - continue; - - spin_lock_irq(&mhi_event->lock); - mhi_ring_er_db(mhi_event); - spin_unlock_irq(&mhi_event->lock); - } - - /* Only ring primary cmd ring if ring is not empty */ - spin_lock_irq(&mhi_cmd->lock); - if (mhi_cmd->ring.rp != mhi_cmd->ring.wp) - mhi_ring_cmd_db(mhi_cntrl, mhi_cmd); - spin_unlock_irq(&mhi_cmd->lock); - } - - /* Ring channel DB registers */ - mhi_chan = mhi_cntrl->mhi_chan; - for (i = 0; i < mhi_cntrl->max_chan; i++, mhi_chan++) { - struct mhi_ring *tre_ring = &mhi_chan->tre_ring; - - if (mhi_chan->db_cfg.reset_req) { - write_lock_irq(&mhi_chan->lock); - mhi_chan->db_cfg.db_mode = true; - write_unlock_irq(&mhi_chan->lock); - } - - read_lock_irq(&mhi_chan->lock); - - /* Only ring DB if ring is not empty */ - if (tre_ring->base && tre_ring->wp != tre_ring->rp) - mhi_ring_chan_db(mhi_cntrl, mhi_chan); - read_unlock_irq(&mhi_chan->lock); - } - - mhi_cntrl->wake_put(mhi_cntrl, false); - read_unlock_bh(&mhi_cntrl->pm_lock); - wake_up_all(&mhi_cntrl->state_event); - - return 0; -} - -/* - * After receiving the MHI state change event from the device indicating the - * transition to M1 state, the host can transition the device to M2 state - * for keeping it in low power state. - */ -void mhi_pm_m1_transition(struct mhi_controller *mhi_cntrl) -{ - enum mhi_pm_state state; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - - write_lock_irq(&mhi_cntrl->pm_lock); - state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_M2); - if (state == MHI_PM_M2) { - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_M2); - mhi_cntrl->dev_state = MHI_STATE_M2; - - write_unlock_irq(&mhi_cntrl->pm_lock); - - mhi_cntrl->M2++; - wake_up_all(&mhi_cntrl->state_event); - - /* If there are any pending resources, exit M2 immediately */ - if (unlikely(atomic_read(&mhi_cntrl->pending_pkts) || - atomic_read(&mhi_cntrl->dev_wake))) { - dev_dbg(dev, - "Exiting M2, pending_pkts: %d dev_wake: %d\n", - atomic_read(&mhi_cntrl->pending_pkts), - atomic_read(&mhi_cntrl->dev_wake)); - read_lock_bh(&mhi_cntrl->pm_lock); - mhi_cntrl->wake_get(mhi_cntrl, true); - mhi_cntrl->wake_put(mhi_cntrl, true); - read_unlock_bh(&mhi_cntrl->pm_lock); - } else { - mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_IDLE); - } - } else { - write_unlock_irq(&mhi_cntrl->pm_lock); - } -} - -/* MHI M3 completion handler */ -int mhi_pm_m3_transition(struct mhi_controller *mhi_cntrl) -{ - enum mhi_pm_state state; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - - write_lock_irq(&mhi_cntrl->pm_lock); - mhi_cntrl->dev_state = MHI_STATE_M3; - state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_M3); - write_unlock_irq(&mhi_cntrl->pm_lock); - if (state != MHI_PM_M3) { - dev_err(dev, "Unable to transition to M3 state\n"); - return -EIO; - } - - mhi_cntrl->M3++; - wake_up_all(&mhi_cntrl->state_event); - - return 0; -} - -/* Handle device Mission Mode transition */ -static int mhi_pm_mission_mode_transition(struct mhi_controller *mhi_cntrl) -{ - struct mhi_event *mhi_event; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - enum mhi_ee_type ee = MHI_EE_MAX, current_ee = mhi_cntrl->ee; - int i, ret; - - dev_dbg(dev, "Processing Mission Mode transition\n"); - - write_lock_irq(&mhi_cntrl->pm_lock); - if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) - ee = mhi_get_exec_env(mhi_cntrl); - - if (!MHI_IN_MISSION_MODE(ee)) { - mhi_cntrl->pm_state = MHI_PM_LD_ERR_FATAL_DETECT; - write_unlock_irq(&mhi_cntrl->pm_lock); - wake_up_all(&mhi_cntrl->state_event); - return -EIO; - } - mhi_cntrl->ee = ee; - write_unlock_irq(&mhi_cntrl->pm_lock); - - wake_up_all(&mhi_cntrl->state_event); - - device_for_each_child(&mhi_cntrl->mhi_dev->dev, ¤t_ee, - mhi_destroy_device); - mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_EE_MISSION_MODE); - - /* Force MHI to be in M0 state before continuing */ - ret = __mhi_device_get_sync(mhi_cntrl); - if (ret) - return ret; - - read_lock_bh(&mhi_cntrl->pm_lock); - - if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - ret = -EIO; - goto error_mission_mode; - } - - /* Add elements to all HW event rings */ - mhi_event = mhi_cntrl->mhi_event; - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { - struct mhi_ring *ring = &mhi_event->ring; - - if (mhi_event->offload_ev || !mhi_event->hw_ring) - continue; - - ring->wp = ring->base + ring->len - ring->el_size; - *ring->ctxt_wp = ring->iommu_base + ring->len - ring->el_size; - /* Update to all cores */ - smp_wmb(); - - spin_lock_irq(&mhi_event->lock); - if (MHI_DB_ACCESS_VALID(mhi_cntrl)) - mhi_ring_er_db(mhi_event); - spin_unlock_irq(&mhi_event->lock); - } - - read_unlock_bh(&mhi_cntrl->pm_lock); - - /* - * The MHI devices are only created when the client device switches its - * Execution Environment (EE) to either SBL or AMSS states - */ - mhi_create_devices(mhi_cntrl); - - read_lock_bh(&mhi_cntrl->pm_lock); - -error_mission_mode: - mhi_cntrl->wake_put(mhi_cntrl, false); - read_unlock_bh(&mhi_cntrl->pm_lock); - - return ret; -} - -/* Handle shutdown transitions */ -static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) -{ - enum mhi_pm_state cur_state; - struct mhi_event *mhi_event; - struct mhi_cmd_ctxt *cmd_ctxt; - struct mhi_cmd *mhi_cmd; - struct mhi_event_ctxt *er_ctxt; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - int ret, i; - - dev_dbg(dev, "Processing disable transition with PM state: %s\n", - to_mhi_pm_state_str(mhi_cntrl->pm_state)); - - mutex_lock(&mhi_cntrl->pm_mutex); - - /* Trigger MHI RESET so that the device will not access host memory */ - if (!MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state)) { - dev_dbg(dev, "Triggering MHI Reset in device\n"); - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET); - - /* Wait for the reset bit to be cleared by the device */ - ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL, - MHICTRL_RESET_MASK, MHICTRL_RESET_SHIFT, 0, - 25000); - if (ret) - dev_err(dev, "Device failed to clear MHI Reset\n"); - - /* - * Device will clear BHI_INTVEC as a part of RESET processing, - * hence re-program it - */ - mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); - } - - dev_dbg(dev, - "Waiting for all pending event ring processing to complete\n"); - mhi_event = mhi_cntrl->mhi_event; - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { - if (mhi_event->offload_ev) - continue; - free_irq(mhi_cntrl->irq[mhi_event->irq], mhi_event); - tasklet_kill(&mhi_event->task); - } - - /* Release lock and wait for all pending threads to complete */ - mutex_unlock(&mhi_cntrl->pm_mutex); - dev_dbg(dev, "Waiting for all pending threads to complete\n"); - wake_up_all(&mhi_cntrl->state_event); - - dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); - device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); - - mutex_lock(&mhi_cntrl->pm_mutex); - - WARN_ON(atomic_read(&mhi_cntrl->dev_wake)); - WARN_ON(atomic_read(&mhi_cntrl->pending_pkts)); - - /* Reset the ev rings and cmd rings */ - dev_dbg(dev, "Resetting EV CTXT and CMD CTXT\n"); - mhi_cmd = mhi_cntrl->mhi_cmd; - cmd_ctxt = mhi_cntrl->mhi_ctxt->cmd_ctxt; - for (i = 0; i < NR_OF_CMD_RINGS; i++, mhi_cmd++, cmd_ctxt++) { - struct mhi_ring *ring = &mhi_cmd->ring; - - ring->rp = ring->base; - ring->wp = ring->base; - cmd_ctxt->rp = cmd_ctxt->rbase; - cmd_ctxt->wp = cmd_ctxt->rbase; - } - - mhi_event = mhi_cntrl->mhi_event; - er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt; - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, er_ctxt++, - mhi_event++) { - struct mhi_ring *ring = &mhi_event->ring; - - /* Skip offload events */ - if (mhi_event->offload_ev) - continue; - - ring->rp = ring->base; - ring->wp = ring->base; - er_ctxt->rp = er_ctxt->rbase; - er_ctxt->wp = er_ctxt->rbase; - } - - /* Move to disable state */ - write_lock_irq(&mhi_cntrl->pm_lock); - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_DISABLE); - write_unlock_irq(&mhi_cntrl->pm_lock); - if (unlikely(cur_state != MHI_PM_DISABLE)) - dev_err(dev, "Error moving from PM state: %s to: %s\n", - to_mhi_pm_state_str(cur_state), - to_mhi_pm_state_str(MHI_PM_DISABLE)); - - dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n", - to_mhi_pm_state_str(mhi_cntrl->pm_state), - TO_MHI_STATE_STR(mhi_cntrl->dev_state)); - - mutex_unlock(&mhi_cntrl->pm_mutex); -} - -/* Handle system error transitions */ -static void mhi_pm_sys_error_transition(struct mhi_controller *mhi_cntrl) -{ - enum mhi_pm_state cur_state, prev_state; - enum dev_st_transition next_state; - struct mhi_event *mhi_event; - struct mhi_cmd_ctxt *cmd_ctxt; - struct mhi_cmd *mhi_cmd; - struct mhi_event_ctxt *er_ctxt; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - int ret, i; - - dev_dbg(dev, "Transitioning from PM state: %s to: %s\n", - to_mhi_pm_state_str(mhi_cntrl->pm_state), - to_mhi_pm_state_str(MHI_PM_SYS_ERR_PROCESS)); - - /* We must notify MHI control driver so it can clean up first */ - mhi_cntrl->status_cb(mhi_cntrl, MHI_CB_SYS_ERROR); - - mutex_lock(&mhi_cntrl->pm_mutex); - write_lock_irq(&mhi_cntrl->pm_lock); - prev_state = mhi_cntrl->pm_state; - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_SYS_ERR_PROCESS); - write_unlock_irq(&mhi_cntrl->pm_lock); - - if (cur_state != MHI_PM_SYS_ERR_PROCESS) { - dev_err(dev, "Failed to transition from PM state: %s to: %s\n", - to_mhi_pm_state_str(cur_state), - to_mhi_pm_state_str(MHI_PM_SYS_ERR_PROCESS)); - goto exit_sys_error_transition; - } - - mhi_cntrl->ee = MHI_EE_DISABLE_TRANSITION; - mhi_cntrl->dev_state = MHI_STATE_RESET; - - /* Wake up threads waiting for state transition */ - wake_up_all(&mhi_cntrl->state_event); - - /* Trigger MHI RESET so that the device will not access host memory */ - if (MHI_REG_ACCESS_VALID(prev_state)) { - u32 in_reset = -1; - unsigned long timeout = msecs_to_jiffies(mhi_cntrl->timeout_ms); - - dev_dbg(dev, "Triggering MHI Reset in device\n"); - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET); - - /* Wait for the reset bit to be cleared by the device */ - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_read_reg_field(mhi_cntrl, - mhi_cntrl->regs, - MHICTRL, - MHICTRL_RESET_MASK, - MHICTRL_RESET_SHIFT, - &in_reset) || - !in_reset, timeout); - if (!ret || in_reset) { - dev_err(dev, "Device failed to exit MHI Reset state\n"); - goto exit_sys_error_transition; - } - - /* - * Device will clear BHI_INTVEC as a part of RESET processing, - * hence re-program it - */ - mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); - } - - dev_dbg(dev, - "Waiting for all pending event ring processing to complete\n"); - mhi_event = mhi_cntrl->mhi_event; - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { - if (mhi_event->offload_ev) - continue; - tasklet_kill(&mhi_event->task); - } - - /* Release lock and wait for all pending threads to complete */ - mutex_unlock(&mhi_cntrl->pm_mutex); - dev_dbg(dev, "Waiting for all pending threads to complete\n"); - wake_up_all(&mhi_cntrl->state_event); - - dev_dbg(dev, "Reset all active channels and remove MHI devices\n"); - device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, mhi_destroy_device); - - mutex_lock(&mhi_cntrl->pm_mutex); - - WARN_ON(atomic_read(&mhi_cntrl->dev_wake)); - WARN_ON(atomic_read(&mhi_cntrl->pending_pkts)); - - /* Reset the ev rings and cmd rings */ - dev_dbg(dev, "Resetting EV CTXT and CMD CTXT\n"); - mhi_cmd = mhi_cntrl->mhi_cmd; - cmd_ctxt = mhi_cntrl->mhi_ctxt->cmd_ctxt; - for (i = 0; i < NR_OF_CMD_RINGS; i++, mhi_cmd++, cmd_ctxt++) { - struct mhi_ring *ring = &mhi_cmd->ring; - - ring->rp = ring->base; - ring->wp = ring->base; - cmd_ctxt->rp = cmd_ctxt->rbase; - cmd_ctxt->wp = cmd_ctxt->rbase; - } - - mhi_event = mhi_cntrl->mhi_event; - er_ctxt = mhi_cntrl->mhi_ctxt->er_ctxt; - for (i = 0; i < mhi_cntrl->total_ev_rings; i++, er_ctxt++, - mhi_event++) { - struct mhi_ring *ring = &mhi_event->ring; - - /* Skip offload events */ - if (mhi_event->offload_ev) - continue; - - ring->rp = ring->base; - ring->wp = ring->base; - er_ctxt->rp = er_ctxt->rbase; - er_ctxt->wp = er_ctxt->rbase; - } - - /* Transition to next state */ - if (MHI_IN_PBL(mhi_get_exec_env(mhi_cntrl))) { - write_lock_irq(&mhi_cntrl->pm_lock); - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_POR); - write_unlock_irq(&mhi_cntrl->pm_lock); - if (cur_state != MHI_PM_POR) { - dev_err(dev, "Error moving to state %s from %s\n", - to_mhi_pm_state_str(MHI_PM_POR), - to_mhi_pm_state_str(cur_state)); - goto exit_sys_error_transition; - } - next_state = DEV_ST_TRANSITION_PBL; - } else { - next_state = DEV_ST_TRANSITION_READY; - } - - mhi_queue_state_transition(mhi_cntrl, next_state); - -exit_sys_error_transition: - dev_dbg(dev, "Exiting with PM state: %s, MHI state: %s\n", - to_mhi_pm_state_str(mhi_cntrl->pm_state), - TO_MHI_STATE_STR(mhi_cntrl->dev_state)); - - mutex_unlock(&mhi_cntrl->pm_mutex); -} - -/* Queue a new work item and schedule work */ -int mhi_queue_state_transition(struct mhi_controller *mhi_cntrl, - enum dev_st_transition state) -{ - struct state_transition *item = kmalloc(sizeof(*item), GFP_ATOMIC); - unsigned long flags; - - if (!item) - return -ENOMEM; - - item->state = state; - spin_lock_irqsave(&mhi_cntrl->transition_lock, flags); - list_add_tail(&item->node, &mhi_cntrl->transition_list); - spin_unlock_irqrestore(&mhi_cntrl->transition_lock, flags); - - queue_work(mhi_cntrl->hiprio_wq, &mhi_cntrl->st_worker); - - return 0; -} - -/* SYS_ERR worker */ -void mhi_pm_sys_err_handler(struct mhi_controller *mhi_cntrl) -{ - struct device *dev = &mhi_cntrl->mhi_dev->dev; - - /* skip if controller supports RDDM */ - if (mhi_cntrl->rddm_image) { - dev_dbg(dev, "Controller supports RDDM, skip SYS_ERROR\n"); - return; - } - - mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_SYS_ERR); -} - -/* Device State Transition worker */ -void mhi_pm_st_worker(struct work_struct *work) -{ - struct state_transition *itr, *tmp; - LIST_HEAD(head); - struct mhi_controller *mhi_cntrl = container_of(work, - struct mhi_controller, - st_worker); - struct device *dev = &mhi_cntrl->mhi_dev->dev; - - spin_lock_irq(&mhi_cntrl->transition_lock); - list_splice_tail_init(&mhi_cntrl->transition_list, &head); - spin_unlock_irq(&mhi_cntrl->transition_lock); - - list_for_each_entry_safe(itr, tmp, &head, node) { - list_del(&itr->node); - dev_dbg(dev, "Handling state transition: %s\n", - TO_DEV_STATE_TRANS_STR(itr->state)); - - switch (itr->state) { - case DEV_ST_TRANSITION_PBL: - write_lock_irq(&mhi_cntrl->pm_lock); - if (MHI_REG_ACCESS_VALID(mhi_cntrl->pm_state)) - mhi_cntrl->ee = mhi_get_exec_env(mhi_cntrl); - write_unlock_irq(&mhi_cntrl->pm_lock); - mhi_fw_load_handler(mhi_cntrl); - break; - case DEV_ST_TRANSITION_SBL: - write_lock_irq(&mhi_cntrl->pm_lock); - mhi_cntrl->ee = MHI_EE_SBL; - write_unlock_irq(&mhi_cntrl->pm_lock); - /* - * The MHI devices are only created when the client - * device switches its Execution Environment (EE) to - * either SBL or AMSS states - */ - mhi_create_devices(mhi_cntrl); - if (mhi_cntrl->fbc_download) - mhi_download_amss_image(mhi_cntrl); - break; - case DEV_ST_TRANSITION_MISSION_MODE: - mhi_pm_mission_mode_transition(mhi_cntrl); - break; - case DEV_ST_TRANSITION_FP: - write_lock_irq(&mhi_cntrl->pm_lock); - mhi_cntrl->ee = MHI_EE_FP; - write_unlock_irq(&mhi_cntrl->pm_lock); - mhi_create_devices(mhi_cntrl); - break; - case DEV_ST_TRANSITION_READY: - mhi_ready_state_transition(mhi_cntrl); - break; - case DEV_ST_TRANSITION_SYS_ERR: - mhi_pm_sys_error_transition(mhi_cntrl); - break; - case DEV_ST_TRANSITION_DISABLE: - mhi_pm_disable_transition(mhi_cntrl); - break; - default: - break; - } - kfree(itr); - } -} - -int mhi_pm_suspend(struct mhi_controller *mhi_cntrl) -{ - struct mhi_chan *itr, *tmp; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - enum mhi_pm_state new_state; - int ret; - - if (mhi_cntrl->pm_state == MHI_PM_DISABLE) - return -EINVAL; - - if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) - return -EIO; - - /* Return busy if there are any pending resources */ - if (atomic_read(&mhi_cntrl->dev_wake) || - atomic_read(&mhi_cntrl->pending_pkts)) - return -EBUSY; - - /* Take MHI out of M2 state */ - read_lock_bh(&mhi_cntrl->pm_lock); - mhi_cntrl->wake_get(mhi_cntrl, false); - read_unlock_bh(&mhi_cntrl->pm_lock); - - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_cntrl->dev_state == MHI_STATE_M0 || - mhi_cntrl->dev_state == MHI_STATE_M1 || - MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state), - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - - read_lock_bh(&mhi_cntrl->pm_lock); - mhi_cntrl->wake_put(mhi_cntrl, false); - read_unlock_bh(&mhi_cntrl->pm_lock); - - if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - dev_err(dev, - "Could not enter M0/M1 state"); - return -EIO; - } - - write_lock_irq(&mhi_cntrl->pm_lock); - - if (atomic_read(&mhi_cntrl->dev_wake) || - atomic_read(&mhi_cntrl->pending_pkts)) { - write_unlock_irq(&mhi_cntrl->pm_lock); - return -EBUSY; - } - - dev_dbg(dev, "Allowing M3 transition\n"); - new_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_M3_ENTER); - if (new_state != MHI_PM_M3_ENTER) { - write_unlock_irq(&mhi_cntrl->pm_lock); - dev_err(dev, - "Error setting to PM state: %s from: %s\n", - to_mhi_pm_state_str(MHI_PM_M3_ENTER), - to_mhi_pm_state_str(mhi_cntrl->pm_state)); - return -EIO; - } - - /* Set MHI to M3 and wait for completion */ - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_M3); - write_unlock_irq(&mhi_cntrl->pm_lock); - dev_dbg(dev, "Waiting for M3 completion\n"); - - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_cntrl->dev_state == MHI_STATE_M3 || - MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state), - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - - if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - dev_err(dev, - "Did not enter M3 state, MHI state: %s, PM state: %s\n", - TO_MHI_STATE_STR(mhi_cntrl->dev_state), - to_mhi_pm_state_str(mhi_cntrl->pm_state)); - return -EIO; - } - - /* Notify clients about entering LPM */ - list_for_each_entry_safe(itr, tmp, &mhi_cntrl->lpm_chans, node) { - mutex_lock(&itr->mutex); - if (itr->mhi_dev) - mhi_notify(itr->mhi_dev, MHI_CB_LPM_ENTER); - mutex_unlock(&itr->mutex); - } - - return 0; -} -EXPORT_SYMBOL_GPL(mhi_pm_suspend); - -static int __mhi_pm_resume(struct mhi_controller *mhi_cntrl, bool force) -{ - struct mhi_chan *itr, *tmp; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - enum mhi_pm_state cur_state; - int ret; - - dev_dbg(dev, "Entered with PM state: %s, MHI state: %s\n", - to_mhi_pm_state_str(mhi_cntrl->pm_state), - TO_MHI_STATE_STR(mhi_cntrl->dev_state)); - - if (mhi_cntrl->pm_state == MHI_PM_DISABLE) - return 0; - - if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) - return -EIO; - - if (mhi_get_mhi_state(mhi_cntrl) != MHI_STATE_M3) { - dev_warn(dev, "Resuming from non M3 state (%s)\n", - TO_MHI_STATE_STR(mhi_get_mhi_state(mhi_cntrl))); - if (!force) - return -EINVAL; - } - - /* Notify clients about exiting LPM */ - list_for_each_entry_safe(itr, tmp, &mhi_cntrl->lpm_chans, node) { - mutex_lock(&itr->mutex); - if (itr->mhi_dev) - mhi_notify(itr->mhi_dev, MHI_CB_LPM_EXIT); - mutex_unlock(&itr->mutex); - } - - write_lock_irq(&mhi_cntrl->pm_lock); - cur_state = mhi_tryset_pm_state(mhi_cntrl, MHI_PM_M3_EXIT); - if (cur_state != MHI_PM_M3_EXIT) { - write_unlock_irq(&mhi_cntrl->pm_lock); - dev_info(dev, - "Error setting to PM state: %s from: %s\n", - to_mhi_pm_state_str(MHI_PM_M3_EXIT), - to_mhi_pm_state_str(mhi_cntrl->pm_state)); - return -EIO; - } - - /* Set MHI to M0 and wait for completion */ - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_M0); - write_unlock_irq(&mhi_cntrl->pm_lock); - - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_cntrl->dev_state == MHI_STATE_M0 || - mhi_cntrl->dev_state == MHI_STATE_M2 || - MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state), - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - - if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - dev_err(dev, - "Did not enter M0 state, MHI state: %s, PM state: %s\n", - TO_MHI_STATE_STR(mhi_cntrl->dev_state), - to_mhi_pm_state_str(mhi_cntrl->pm_state)); - return -EIO; - } - - return 0; -} - -int mhi_pm_resume(struct mhi_controller *mhi_cntrl) -{ - return __mhi_pm_resume(mhi_cntrl, false); -} -EXPORT_SYMBOL_GPL(mhi_pm_resume); - -int mhi_pm_resume_force(struct mhi_controller *mhi_cntrl) -{ - return __mhi_pm_resume(mhi_cntrl, true); -} -EXPORT_SYMBOL_GPL(mhi_pm_resume_force); - -int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl) -{ - int ret; - - /* Wake up the device */ - read_lock_bh(&mhi_cntrl->pm_lock); - if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - read_unlock_bh(&mhi_cntrl->pm_lock); - return -EIO; - } - mhi_cntrl->wake_get(mhi_cntrl, true); - if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) - mhi_trigger_resume(mhi_cntrl); - read_unlock_bh(&mhi_cntrl->pm_lock); - - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_cntrl->pm_state == MHI_PM_M0 || - MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state), - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - - if (!ret || MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) { - read_lock_bh(&mhi_cntrl->pm_lock); - mhi_cntrl->wake_put(mhi_cntrl, false); - read_unlock_bh(&mhi_cntrl->pm_lock); - return -EIO; - } - - return 0; -} - -/* Assert device wake db */ -static void mhi_assert_dev_wake(struct mhi_controller *mhi_cntrl, bool force) -{ - unsigned long flags; - - /* - * If force flag is set, then increment the wake count value and - * ring wake db - */ - if (unlikely(force)) { - spin_lock_irqsave(&mhi_cntrl->wlock, flags); - atomic_inc(&mhi_cntrl->dev_wake); - if (MHI_WAKE_DB_FORCE_SET_VALID(mhi_cntrl->pm_state) && - !mhi_cntrl->wake_set) { - mhi_write_db(mhi_cntrl, mhi_cntrl->wake_db, 1); - mhi_cntrl->wake_set = true; - } - spin_unlock_irqrestore(&mhi_cntrl->wlock, flags); - } else { - /* - * If resources are already requested, then just increment - * the wake count value and return - */ - if (likely(atomic_add_unless(&mhi_cntrl->dev_wake, 1, 0))) - return; - - spin_lock_irqsave(&mhi_cntrl->wlock, flags); - if ((atomic_inc_return(&mhi_cntrl->dev_wake) == 1) && - MHI_WAKE_DB_SET_VALID(mhi_cntrl->pm_state) && - !mhi_cntrl->wake_set) { - mhi_write_db(mhi_cntrl, mhi_cntrl->wake_db, 1); - mhi_cntrl->wake_set = true; - } - spin_unlock_irqrestore(&mhi_cntrl->wlock, flags); - } -} - -/* De-assert device wake db */ -static void mhi_deassert_dev_wake(struct mhi_controller *mhi_cntrl, - bool override) -{ - unsigned long flags; - - /* - * Only continue if there is a single resource, else just decrement - * and return - */ - if (likely(atomic_add_unless(&mhi_cntrl->dev_wake, -1, 1))) - return; - - spin_lock_irqsave(&mhi_cntrl->wlock, flags); - if ((atomic_dec_return(&mhi_cntrl->dev_wake) == 0) && - MHI_WAKE_DB_CLEAR_VALID(mhi_cntrl->pm_state) && !override && - mhi_cntrl->wake_set) { - mhi_write_db(mhi_cntrl, mhi_cntrl->wake_db, 0); - mhi_cntrl->wake_set = false; - } - spin_unlock_irqrestore(&mhi_cntrl->wlock, flags); -} - -int mhi_async_power_up(struct mhi_controller *mhi_cntrl) -{ - enum mhi_state state; - enum mhi_ee_type current_ee; - enum dev_st_transition next_state; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - u32 val; - int ret; - - dev_info(dev, "Requested to power ON\n"); - - /* Supply default wake routines if not provided by controller driver */ - if (!mhi_cntrl->wake_get || !mhi_cntrl->wake_put || - !mhi_cntrl->wake_toggle) { - mhi_cntrl->wake_get = mhi_assert_dev_wake; - mhi_cntrl->wake_put = mhi_deassert_dev_wake; - mhi_cntrl->wake_toggle = (mhi_cntrl->db_access & MHI_PM_M2) ? - mhi_toggle_dev_wake_nop : mhi_toggle_dev_wake; - } - - mutex_lock(&mhi_cntrl->pm_mutex); - mhi_cntrl->pm_state = MHI_PM_DISABLE; - - ret = mhi_init_irq_setup(mhi_cntrl); - if (ret) - goto error_setup_irq; - - /* Setup BHI INTVEC */ - write_lock_irq(&mhi_cntrl->pm_lock); - mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); - mhi_cntrl->pm_state = MHI_PM_POR; - mhi_cntrl->ee = MHI_EE_MAX; - current_ee = mhi_get_exec_env(mhi_cntrl); - write_unlock_irq(&mhi_cntrl->pm_lock); - - /* Confirm that the device is in valid exec env */ - if (!MHI_IN_PBL(current_ee) && current_ee != MHI_EE_AMSS) { - dev_err(dev, "%s is not a valid EE for power on\n", - TO_MHI_EXEC_STR(current_ee)); - ret = -EIO; - goto error_async_power_up; - } - - state = mhi_get_mhi_state(mhi_cntrl); - dev_dbg(dev, "Attempting power on with EE: %s, state: %s\n", - TO_MHI_EXEC_STR(current_ee), TO_MHI_STATE_STR(state)); - - if (state == MHI_STATE_SYS_ERR) { - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET); - ret = wait_event_timeout(mhi_cntrl->state_event, - MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state) || - mhi_read_reg_field(mhi_cntrl, - mhi_cntrl->regs, - MHICTRL, - MHICTRL_RESET_MASK, - MHICTRL_RESET_SHIFT, - &val) || - !val, - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - if (!ret) { - ret = -EIO; - dev_info(dev, "Failed to reset MHI due to syserr state\n"); - goto error_async_power_up; - } - - /* - * device cleares INTVEC as part of RESET processing, - * re-program it - */ - mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); - } - - /* Transition to next state */ - next_state = MHI_IN_PBL(current_ee) ? - DEV_ST_TRANSITION_PBL : DEV_ST_TRANSITION_READY; - - mhi_queue_state_transition(mhi_cntrl, next_state); - - mutex_unlock(&mhi_cntrl->pm_mutex); - - dev_info(dev, "Power on setup success\n"); - - return 0; - -error_async_power_up: - mhi_deinit_free_irq(mhi_cntrl); - -error_setup_irq: - mhi_cntrl->pm_state = MHI_PM_DISABLE; - mutex_unlock(&mhi_cntrl->pm_mutex); - - return ret; -} -EXPORT_SYMBOL_GPL(mhi_async_power_up); - -void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) -{ - enum mhi_pm_state cur_state, transition_state; - struct device *dev = &mhi_cntrl->mhi_dev->dev; - - mutex_lock(&mhi_cntrl->pm_mutex); - write_lock_irq(&mhi_cntrl->pm_lock); - cur_state = mhi_cntrl->pm_state; - if (cur_state == MHI_PM_DISABLE) { - write_unlock_irq(&mhi_cntrl->pm_lock); - mutex_unlock(&mhi_cntrl->pm_mutex); - return; /* Already powered down */ - } - - /* If it's not a graceful shutdown, force MHI to linkdown state */ - transition_state = (graceful) ? MHI_PM_SHUTDOWN_PROCESS : - MHI_PM_LD_ERR_FATAL_DETECT; - - cur_state = mhi_tryset_pm_state(mhi_cntrl, transition_state); - if (cur_state != transition_state) { - dev_err(dev, "Failed to move to state: %s from: %s\n", - to_mhi_pm_state_str(transition_state), - to_mhi_pm_state_str(mhi_cntrl->pm_state)); - /* Force link down or error fatal detected state */ - mhi_cntrl->pm_state = MHI_PM_LD_ERR_FATAL_DETECT; - } - - /* mark device inactive to avoid any further host processing */ - mhi_cntrl->ee = MHI_EE_DISABLE_TRANSITION; - mhi_cntrl->dev_state = MHI_STATE_RESET; - - wake_up_all(&mhi_cntrl->state_event); - - write_unlock_irq(&mhi_cntrl->pm_lock); - mutex_unlock(&mhi_cntrl->pm_mutex); - - mhi_queue_state_transition(mhi_cntrl, DEV_ST_TRANSITION_DISABLE); - - /* Wait for shutdown to complete */ - flush_work(&mhi_cntrl->st_worker); - - free_irq(mhi_cntrl->irq[0], mhi_cntrl); -} -EXPORT_SYMBOL_GPL(mhi_power_down); - -int mhi_sync_power_up(struct mhi_controller *mhi_cntrl) -{ - int ret = mhi_async_power_up(mhi_cntrl); - - if (ret) - return ret; - - wait_event_timeout(mhi_cntrl->state_event, - MHI_IN_MISSION_MODE(mhi_cntrl->ee) || - MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state), - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - - ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT; - if (ret) - mhi_power_down(mhi_cntrl, false); - - return ret; -} -EXPORT_SYMBOL(mhi_sync_power_up); - -int mhi_force_rddm_mode(struct mhi_controller *mhi_cntrl) -{ - struct device *dev = &mhi_cntrl->mhi_dev->dev; - int ret; - - /* Check if device is already in RDDM */ - if (mhi_cntrl->ee == MHI_EE_RDDM) - return 0; - - dev_dbg(dev, "Triggering SYS_ERR to force RDDM state\n"); - mhi_set_mhi_state(mhi_cntrl, MHI_STATE_SYS_ERR); - - /* Wait for RDDM event */ - ret = wait_event_timeout(mhi_cntrl->state_event, - mhi_cntrl->ee == MHI_EE_RDDM, - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - ret = ret ? 0 : -EIO; - - return ret; -} -EXPORT_SYMBOL_GPL(mhi_force_rddm_mode); - -void mhi_device_get(struct mhi_device *mhi_dev) -{ - struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; - - mhi_dev->dev_wake++; - read_lock_bh(&mhi_cntrl->pm_lock); - if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) - mhi_trigger_resume(mhi_cntrl); - - mhi_cntrl->wake_get(mhi_cntrl, true); - read_unlock_bh(&mhi_cntrl->pm_lock); -} -EXPORT_SYMBOL_GPL(mhi_device_get); - -int mhi_device_get_sync(struct mhi_device *mhi_dev) -{ - struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; - int ret; - - ret = __mhi_device_get_sync(mhi_cntrl); - if (!ret) - mhi_dev->dev_wake++; - - return ret; -} -EXPORT_SYMBOL_GPL(mhi_device_get_sync); - -void mhi_device_put(struct mhi_device *mhi_dev) -{ - struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; - - mhi_dev->dev_wake--; - read_lock_bh(&mhi_cntrl->pm_lock); - if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state)) - mhi_trigger_resume(mhi_cntrl); - - mhi_cntrl->wake_put(mhi_cntrl, false); - read_unlock_bh(&mhi_cntrl->pm_lock); -} -EXPORT_SYMBOL_GPL(mhi_device_put); |