struct device *dev = &mhi_cntrl->mhi_dev->dev;
enum mhi_state state;
u32 int_value;
+ bool mhi_reset;
/* Acknowledge the ctrl interrupt */
int_value = mhi_ep_mmio_read(mhi_cntrl, MHI_CTRL_INT_STATUS);
/* Check for ctrl interrupt */
if (FIELD_GET(MHI_CTRL_INT_STATUS_MSK, int_value)) {
dev_dbg(dev, "Processing ctrl interrupt\n");
+ mhi_ep_mmio_get_mhi_state(mhi_cntrl, &state, &mhi_reset);
+ if (mhi_reset) {
+ dev_info(dev, "Host triggered MHI reset!\n");
+ disable_irq_nosync(mhi_cntrl->irq);
+ schedule_work(&mhi_cntrl->reset_work);
+ return IRQ_HANDLED;
+ }
+
mhi_ep_process_ctrl_interrupt(mhi_cntrl, state);
}
mhi_cntrl->enabled = false;
}
+static void mhi_ep_reset_worker(struct work_struct *work)
+{
+ struct mhi_ep_cntrl *mhi_cntrl = container_of(work, struct mhi_ep_cntrl, reset_work);
+ struct device *dev = &mhi_cntrl->mhi_dev->dev;
+ enum mhi_state cur_state;
+ int ret;
+
+ mhi_ep_abort_transfer(mhi_cntrl);
+
+ spin_lock_bh(&mhi_cntrl->state_lock);
+ /* Reset MMIO to signal host that the MHI_RESET is completed in endpoint */
+ mhi_ep_mmio_reset(mhi_cntrl);
+ cur_state = mhi_cntrl->mhi_state;
+ spin_unlock_bh(&mhi_cntrl->state_lock);
+
+ /*
+ * Only proceed further if the reset is due to SYS_ERR. The host will
+ * issue reset during shutdown also and we don't need to do re-init in
+ * that case.
+ */
+ if (cur_state == MHI_STATE_SYS_ERR) {
+ mhi_ep_mmio_init(mhi_cntrl);
+
+ /* Set AMSS EE before signaling ready state */
+ mhi_ep_mmio_set_env(mhi_cntrl, MHI_EE_AMSS);
+
+ /* All set, notify the host that we are ready */
+ ret = mhi_ep_set_ready_state(mhi_cntrl);
+ if (ret)
+ return;
+
+ dev_dbg(dev, "READY state notification sent to the host\n");
+
+ ret = mhi_ep_enable(mhi_cntrl);
+ if (ret) {
+ dev_err(dev, "Failed to enable MHI endpoint: %d\n", ret);
+ return;
+ }
+
+ enable_irq(mhi_cntrl->irq);
+ }
+}
+
int mhi_ep_power_up(struct mhi_ep_cntrl *mhi_cntrl)
{
struct device *dev = &mhi_cntrl->mhi_dev->dev;
}
INIT_WORK(&mhi_cntrl->state_work, mhi_ep_state_worker);
+ INIT_WORK(&mhi_cntrl->reset_work, mhi_ep_reset_worker);
mhi_cntrl->wq = alloc_workqueue("mhi_ep_wq", 0, 0);
if (!mhi_cntrl->wq) {
* @ch_db_list: List of queued channel doorbells
* @wq: Dedicated workqueue for handling rings and state changes
* @state_work: State transition worker
+ * @reset_work: Worker for MHI Endpoint reset
* @raise_irq: CB function for raising IRQ to the host
* @alloc_map: CB function for allocating memory in endpoint for storing host context and mapping it
* @unmap_free: CB function to unmap and free the allocated memory in endpoint for storing host context
struct workqueue_struct *wq;
struct work_struct state_work;
+ struct work_struct reset_work;
void (*raise_irq)(struct mhi_ep_cntrl *mhi_cntrl, u32 vector);
int (*alloc_map)(struct mhi_ep_cntrl *mhi_cntrl, u64 pci_addr, phys_addr_t *phys_ptr,