#undef MEI_DEV_STATE
}
-void mei_device_init(struct mei_device *dev)
-{
- /* setup our list array */
- INIT_LIST_HEAD(&dev->file_list);
- INIT_LIST_HEAD(&dev->device_list);
- mutex_init(&dev->device_lock);
- init_waitqueue_head(&dev->wait_hw_ready);
- init_waitqueue_head(&dev->wait_recvd_msg);
- init_waitqueue_head(&dev->wait_stop_wd);
- dev->dev_state = MEI_DEV_INITIALIZING;
- mei_io_list_init(&dev->read_list);
- mei_io_list_init(&dev->write_list);
- mei_io_list_init(&dev->write_waiting_list);
- mei_io_list_init(&dev->ctrl_wr_list);
- mei_io_list_init(&dev->ctrl_rd_list);
+/**
+ * mei_cancel_work. Cancel mei background jobs
+ *
+ * @dev: the device structure
+ *
+ * returns 0 on success or < 0 if the reset hasn't succeeded
+ */
+void mei_cancel_work(struct mei_device *dev)
+{
+ cancel_work_sync(&dev->init_work);
+ cancel_work_sync(&dev->reset_work);
- INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
- INIT_WORK(&dev->init_work, mei_host_client_init);
+ cancel_delayed_work(&dev->timer_work);
+}
+EXPORT_SYMBOL_GPL(mei_cancel_work);
- INIT_LIST_HEAD(&dev->wd_cl.link);
- INIT_LIST_HEAD(&dev->iamthif_cl.link);
- mei_io_list_init(&dev->amthif_cmd_list);
- mei_io_list_init(&dev->amthif_rd_complete_list);
+/**
+ * mei_reset - resets host and fw.
+ *
+ * @dev: the device structure
+ */
+int mei_reset(struct mei_device *dev)
+{
+ enum mei_dev_state state = dev->dev_state;
+ bool interrupts_enabled;
+ int ret;
- bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
- dev->open_handle_count = 0;
+ if (state != MEI_DEV_INITIALIZING &&
+ state != MEI_DEV_DISABLED &&
+ state != MEI_DEV_POWER_DOWN &&
+ state != MEI_DEV_POWER_UP)
+ dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
+ mei_dev_state_str(state));
- /*
- * Reserving the first client ID
- * 0: Reserved for MEI Bus Message communications
+ /* we're already in reset, cancel the init timer
+ * if the reset was called due the hbm protocol error
+ * we need to call it before hw start
+ * so the hbm watchdog won't kick in
*/
- bitmap_set(dev->host_clients_map, 0, 1);
+ mei_hbm_idle(dev);
+
+ /* enter reset flow */
+ interrupts_enabled = state != MEI_DEV_POWER_DOWN;
+ dev->dev_state = MEI_DEV_RESETTING;
+
+ dev->reset_count++;
+ if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
+ dev_err(&dev->pdev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
+ dev->dev_state = MEI_DEV_DISABLED;
+ return -ENODEV;
+ }
+
+ ret = mei_hw_reset(dev, interrupts_enabled);
+ /* fall through and remove the sw state even if hw reset has failed */
+
+ /* no need to clean up software state in case of power up */
+ if (state != MEI_DEV_INITIALIZING &&
+ state != MEI_DEV_POWER_UP) {
+
+ /* remove all waiting requests */
+ mei_cl_all_write_clear(dev);
+
+ mei_cl_all_disconnect(dev);
+
+ /* wake up all readers and writers so they can be interrupted */
+ mei_cl_all_wakeup(dev);
+
+ /* remove entry if already in list */
+ dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
+ mei_cl_unlink(&dev->wd_cl);
+ mei_cl_unlink(&dev->iamthif_cl);
+ mei_amthif_reset_params(dev);
+ memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
+ }
+
+
+ dev->me_clients_num = 0;
+ dev->rd_msg_hdr = 0;
+ dev->wd_pending = false;
+
+ if (ret) {
+ dev_err(&dev->pdev->dev, "hw_reset failed ret = %d\n", ret);
+ dev->dev_state = MEI_DEV_DISABLED;
+ return ret;
+ }
+
+ if (state == MEI_DEV_POWER_DOWN) {
+ dev_dbg(&dev->pdev->dev, "powering down: end of reset\n");
+ dev->dev_state = MEI_DEV_DISABLED;
+ return 0;
+ }
+
+ ret = mei_hw_start(dev);
+ if (ret) {
+ dev_err(&dev->pdev->dev, "hw_start failed ret = %d\n", ret);
+ dev->dev_state = MEI_DEV_DISABLED;
+ return ret;
+ }
+
+ dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
+
+ dev->dev_state = MEI_DEV_INIT_CLIENTS;
+ ret = mei_hbm_start_req(dev);
+ if (ret) {
+ dev_err(&dev->pdev->dev, "hbm_start failed ret = %d\n", ret);
+ dev->dev_state = MEI_DEV_DISABLED;
+ return ret;
+ }
+
+ return 0;
}
-EXPORT_SYMBOL_GPL(mei_device_init);
+EXPORT_SYMBOL_GPL(mei_reset);
/**
* mei_start - initializes host and fw to start work.
{
mutex_lock(&dev->device_lock);
- /* acknowledge interrupt and stop interupts */
+ /* acknowledge interrupt and stop interrupts */
mei_clear_interrupts(dev);
mei_hw_config(dev);
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
- mei_reset(dev, 1);
+ dev->dev_state = MEI_DEV_INITIALIZING;
+ dev->reset_count = 0;
+ mei_reset(dev);
+
+ if (dev->dev_state == MEI_DEV_DISABLED) {
+ dev_err(&dev->pdev->dev, "reset failed");
+ goto err;
+ }
if (mei_hbm_start_wait(dev)) {
dev_err(&dev->pdev->dev, "HBM haven't started");
EXPORT_SYMBOL_GPL(mei_start);
/**
- * mei_reset - resets host and fw.
+ * mei_restart - restart device after suspend
*
* @dev: the device structure
- * @interrupts_enabled: if interrupt should be enabled after reset.
+ *
+ * returns 0 on success or -ENODEV if the restart hasn't succeeded
*/
-void mei_reset(struct mei_device *dev, int interrupts_enabled)
+int mei_restart(struct mei_device *dev)
{
- bool unexpected;
- int ret;
-
- unexpected = (dev->dev_state != MEI_DEV_INITIALIZING &&
- dev->dev_state != MEI_DEV_DISABLED &&
- dev->dev_state != MEI_DEV_POWER_DOWN &&
- dev->dev_state != MEI_DEV_POWER_UP);
+ int err;
- if (unexpected)
- dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
- mei_dev_state_str(dev->dev_state));
-
- ret = mei_hw_reset(dev, interrupts_enabled);
- if (ret) {
- dev_err(&dev->pdev->dev, "hw reset failed disabling the device\n");
- interrupts_enabled = false;
- dev->dev_state = MEI_DEV_DISABLED;
- }
-
- dev->hbm_state = MEI_HBM_IDLE;
+ mutex_lock(&dev->device_lock);
- if (dev->dev_state != MEI_DEV_INITIALIZING &&
- dev->dev_state != MEI_DEV_POWER_UP) {
- if (dev->dev_state != MEI_DEV_DISABLED &&
- dev->dev_state != MEI_DEV_POWER_DOWN)
- dev->dev_state = MEI_DEV_RESETTING;
+ mei_clear_interrupts(dev);
- /* remove all waiting requests */
- mei_cl_all_write_clear(dev);
+ dev->dev_state = MEI_DEV_POWER_UP;
+ dev->reset_count = 0;
- mei_cl_all_disconnect(dev);
+ err = mei_reset(dev);
- /* wake up all readings so they can be interrupted */
- mei_cl_all_wakeup(dev);
-
- /* remove entry if already in list */
- dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
- mei_cl_unlink(&dev->wd_cl);
- mei_cl_unlink(&dev->iamthif_cl);
- mei_amthif_reset_params(dev);
- memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
- }
+ mutex_unlock(&dev->device_lock);
- /* we're already in reset, cancel the init timer */
- dev->init_clients_timer = 0;
+ if (err || dev->dev_state == MEI_DEV_DISABLED)
+ return -ENODEV;
- dev->me_clients_num = 0;
- dev->rd_msg_hdr = 0;
- dev->wd_pending = false;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mei_restart);
- if (!interrupts_enabled) {
- dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n");
- return;
- }
- ret = mei_hw_start(dev);
- if (ret) {
- dev_err(&dev->pdev->dev, "hw_start failed disabling the device\n");
- dev->dev_state = MEI_DEV_DISABLED;
- return;
- }
+static void mei_reset_work(struct work_struct *work)
+{
+ struct mei_device *dev =
+ container_of(work, struct mei_device, reset_work);
- dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
- /* link is established * start sending messages. */
+ mutex_lock(&dev->device_lock);
- dev->dev_state = MEI_DEV_INIT_CLIENTS;
+ mei_reset(dev);
- mei_hbm_start_req(dev);
+ mutex_unlock(&dev->device_lock);
+ if (dev->dev_state == MEI_DEV_DISABLED)
+ dev_err(&dev->pdev->dev, "reset failed");
}
-EXPORT_SYMBOL_GPL(mei_reset);
void mei_stop(struct mei_device *dev)
{
dev_dbg(&dev->pdev->dev, "stopping the device.\n");
- flush_scheduled_work();
+ mei_cancel_work(dev);
- mutex_lock(&dev->device_lock);
+ mei_nfc_host_exit(dev);
- cancel_delayed_work(&dev->timer_work);
+ mutex_lock(&dev->device_lock);
mei_wd_stop(dev);
- mei_nfc_host_exit();
-
dev->dev_state = MEI_DEV_POWER_DOWN;
- mei_reset(dev, 0);
+ mei_reset(dev);
mutex_unlock(&dev->device_lock);
+void mei_device_init(struct mei_device *dev)
+{
+ /* setup our list array */
+ INIT_LIST_HEAD(&dev->file_list);
+ INIT_LIST_HEAD(&dev->device_list);
+ mutex_init(&dev->device_lock);
+ init_waitqueue_head(&dev->wait_hw_ready);
+ init_waitqueue_head(&dev->wait_recvd_msg);
+ init_waitqueue_head(&dev->wait_stop_wd);
+ dev->dev_state = MEI_DEV_INITIALIZING;
+ dev->reset_count = 0;
+
+ mei_io_list_init(&dev->read_list);
+ mei_io_list_init(&dev->write_list);
+ mei_io_list_init(&dev->write_waiting_list);
+ mei_io_list_init(&dev->ctrl_wr_list);
+ mei_io_list_init(&dev->ctrl_rd_list);
+
+ INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
+ INIT_WORK(&dev->init_work, mei_host_client_init);
+ INIT_WORK(&dev->reset_work, mei_reset_work);
+
+ INIT_LIST_HEAD(&dev->wd_cl.link);
+ INIT_LIST_HEAD(&dev->iamthif_cl.link);
+ mei_io_list_init(&dev->amthif_cmd_list);
+ mei_io_list_init(&dev->amthif_rd_complete_list);
+
+ bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
+ dev->open_handle_count = 0;
+
+ /*
+ * Reserving the first client ID
+ * 0: Reserved for MEI Bus Message communications
+ */
+ bitmap_set(dev->host_clients_map, 0, 1);
+}
+EXPORT_SYMBOL_GPL(mei_device_init);
+
projects / firefly-linux-kernel-4.4.55.git / blobdiff