int mhi_resume(struct pci_dev *pcie_dev)
{
int r = 0;
mhi_device_ctxt *mhi_dev_ctxt =
*(mhi_device_ctxt **)((pcie_dev->dev).platform_data);
mhi_log(MHI_MSG_ERROR, "[%s]\n", __func__);
r = mhi_initiate_m0(mhi_dev_ctxt);
if (r)
goto exit;
r = wait_event_interruptible_timeout(*mhi_dev_ctxt->M0_event,
mhi_dev_ctxt->mhi_state == MHI_STATE_M0 ||
mhi_dev_ctxt->mhi_state == MHI_STATE_M1,
msecs_to_jiffies(MHI_MAX_SUSPEND_TIMEOUT));
switch(r) {
case 0:
mhi_log(MHI_MSG_CRITICAL | MHI_DBG_POWER,
"Timeout: No M0 event after %d ms\n",
MHI_MAX_SUSPEND_TIMEOUT);
mhi_dev_ctxt->counters.m0_event_timeouts++;
r = -ETIME;
break;
case -ERESTARTSYS:
mhi_log(MHI_MSG_CRITICAL | MHI_DBG_POWER,
"Going Down...\n");
break;
default:
mhi_log(MHI_MSG_INFO | MHI_DBG_POWER,
"Wait complete state: %d\n", mhi_dev_ctxt->mhi_state);
r = 0;
}
exit:
atomic_set(&mhi_dev_ctxt->flags.pending_resume, 0);
return r;
}
void m0_work(struct work_struct *work)
{
mhi_device_ctxt *mhi_dev_ctxt =
container_of(work, mhi_device_ctxt, m0_work);
if (!atomic_read(&mhi_dev_ctxt->flags.pending_resume)) {
mhi_log(MHI_MSG_INFO, "No pending resume, initiating M0.\n");
mhi_initiate_m0(mhi_dev_ctxt);
} else {
mhi_log(MHI_MSG_INFO, "Pending resume, quitting.\n");
}
}
ssize_t sysfs_init_M0(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
mhi_device_ctxt *mhi_dev_ctxt = mhi_devices.device_list[0].mhi_ctxt;
if (MHI_STATUS_SUCCESS != mhi_turn_on_pcie_link(mhi_dev_ctxt)) {
mhi_log(MHI_MSG_CRITICAL | MHI_DBG_POWER,
"Failed to resume link\n");
return count;
}
mhi_initiate_m0(mhi_dev_ctxt);
mhi_log(MHI_MSG_CRITICAL | MHI_DBG_POWER,
"Current mhi_state = 0x%x\n",
mhi_dev_ctxt->mhi_state);
return count;
}
MHI_STATUS process_WAKE_transition(mhi_device_ctxt *mhi_dev_ctxt,
STATE_TRANSITION cur_work_item)
{
MHI_STATUS ret_val = MHI_STATUS_SUCCESS;
mhi_log(MHI_MSG_INFO, "Entered\n");
__pm_stay_awake(&mhi_dev_ctxt->wake_lock);
ret_val = mhi_turn_on_pcie_link(mhi_dev_ctxt);
if (MHI_STATUS_SUCCESS != ret_val) {
mhi_log(MHI_MSG_CRITICAL,
"Failed to turn on PCIe link.\n");
goto exit;
}
mhi_dev_ctxt->flags.stop_threads = 0;
if (mhi_dev_ctxt->flags.mhi_initialized &&
mhi_dev_ctxt->flags.link_up) {
mhi_log(MHI_MSG_CRITICAL,
"MHI is initialized, transitioning to M0.\n");
mhi_initiate_m0(mhi_dev_ctxt);
}
if (!mhi_dev_ctxt->flags.mhi_initialized) {
mhi_log(MHI_MSG_CRITICAL,
"MHI is not initialized transitioning to base.\n");
ret_val = init_mhi_base_state(mhi_dev_ctxt);
if (MHI_STATUS_SUCCESS != ret_val)
mhi_log(MHI_MSG_CRITICAL,
"Failed to transition to base state %d.\n",
ret_val);
}
exit:
mhi_log(MHI_MSG_INFO, "Exited.\n");
__pm_relax(&mhi_dev_ctxt->wake_lock);
return ret_val;
}
