/**
* mei_start - initializes host and fw to start work.
*
* @dev: the device structure
*
* returns 0 on success, <0 on failure.
*/
int mei_start(struct mei_device *dev)
{
int ret;
mutex_lock(&dev->device_lock);
/* 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");
dev->reset_count = 0;
do {
dev->dev_state = MEI_DEV_INITIALIZING;
ret = mei_reset(dev);
if (ret == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
dev_err(&dev->pdev->dev, "reset failed ret = %d", ret);
goto err;
}
} while (ret);
/* we cannot start the device w/o hbm start message completed */
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");
goto err;
}
if (!mei_host_is_ready(dev)) {
dev_err(&dev->pdev->dev, "host is not ready.\n");
goto err;
}
if (!mei_hw_is_ready(dev)) {
dev_err(&dev->pdev->dev, "ME is not ready.\n");
goto err;
}
if (!mei_hbm_version_is_supported(dev)) {
dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
goto err;
}
dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
mutex_unlock(&dev->device_lock);
return 0;
err:
dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
dev->dev_state = MEI_DEV_DISABLED;
mutex_unlock(&dev->device_lock);
return -ENODEV;
}
/**
* mei_start - initializes host and fw to start work.
*
* @dev: the device structure
*
* returns 0 on success, <0 on failure.
*/
int mei_start(struct mei_device *dev)
{
mutex_lock(&dev->device_lock);
/* acknowledge interrupt and stop interupts */
mei_clear_interrupts(dev);
mei_hw_config(dev);
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
mei_reset(dev, 1);
if (mei_hbm_start_wait(dev)) {
dev_err(&dev->pdev->dev, "HBM haven't started");
goto err;
}
if (!mei_host_is_ready(dev)) {
dev_err(&dev->pdev->dev, "host is not ready.\n");
goto err;
}
if (!mei_hw_is_ready(dev)) {
dev_err(&dev->pdev->dev, "ME is not ready.\n");
goto err;
}
if (dev->version.major_version != HBM_MAJOR_VERSION ||
dev->version.minor_version != HBM_MINOR_VERSION) {
dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
goto err;
}
dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
mutex_unlock(&dev->device_lock);
return 0;
err:
dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
dev->dev_state = MEI_DEV_DISABLED;
mutex_unlock(&dev->device_lock);
return -ENODEV;
}
/**
* mei_hw_init - initializes host and fw to start work.
*
* @dev: the device structure
*
* returns 0 on success, <0 on failure.
*/
int mei_hw_init(struct mei_device *dev)
{
int ret = 0;
mutex_lock(&dev->device_lock);
/* acknowledge interrupt and stop interupts */
mei_clear_interrupts(dev);
mei_hw_config(dev);
dev->recvd_msg = false;
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
mei_reset(dev, 1);
/* wait for ME to turn on ME_RDY */
if (!dev->recvd_msg) {
mutex_unlock(&dev->device_lock);
ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
dev->recvd_msg,
mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
mutex_lock(&dev->device_lock);
}
if (ret <= 0 && !dev->recvd_msg) {
dev->dev_state = MEI_DEV_DISABLED;
dev_dbg(&dev->pdev->dev,
"wait_event_interruptible_timeout failed"
"on wait for ME to turn on ME_RDY.\n");
goto err;
}
if (!mei_host_is_ready(dev)) {
dev_err(&dev->pdev->dev, "host is not ready.\n");
goto err;
}
if (!mei_hw_is_ready(dev)) {
dev_err(&dev->pdev->dev, "ME is not ready.\n");
goto err;
}
if (dev->version.major_version != HBM_MAJOR_VERSION ||
dev->version.minor_version != HBM_MINOR_VERSION) {
dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
goto err;
}
dev->recvd_msg = false;
dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
mutex_unlock(&dev->device_lock);
return 0;
err:
dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
dev->dev_state = MEI_DEV_DISABLED;
mutex_unlock(&dev->device_lock);
return -ENODEV;
}