/**
* mei_reset - resets host and fw.
*
* @dev: the device structure
* @interrupts_enabled: if interrupt should be enabled after reset.
*/
void mei_reset(struct mei_device *dev, int interrupts_enabled)
{
bool unexpected;
if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET)
return;
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);
mei_hw_reset(dev, interrupts_enabled);
if (dev->dev_state != MEI_DEV_INITIALIZING) {
if (dev->dev_state != MEI_DEV_DISABLED &&
dev->dev_state != MEI_DEV_POWER_DOWN)
dev->dev_state = MEI_DEV_RESETING;
mei_cl_all_disconnect(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);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
mei_cl_unlink(&dev->iamthif_cl);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
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 (unexpected)
dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
mei_dev_state_str(dev->dev_state));
/* wake up all readings so they can be interrupted */
mei_cl_all_read_wakeup(dev);
/* remove all waiting requests */
mei_cl_all_write_clear(dev);
}
/**
* 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;
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));
/* 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
*/
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);
}
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);
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);
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_RESETTING;
return ret;
}
return 0;
}
/**
* mei_reset - resets host and fw.
*
* @dev: the device structure
* @interrupts_enabled: if interrupt should be enabled after reset.
*/
void mei_reset(struct mei_device *dev, int interrupts_enabled)
{
bool unexpected;
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);
mei_hw_reset(dev, interrupts_enabled);
dev->hbm_state = MEI_HBM_IDLE;
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_cl_all_disconnect(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);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
mei_cl_unlink(&dev->iamthif_cl);
if (dev->open_handle_count > 0)
dev->open_handle_count--;
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 (unexpected)
dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
mei_dev_state_str(dev->dev_state));
if (!interrupts_enabled) {
dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n");
return;
}
mei_hw_start(dev);
dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
/* link is established * start sending messages. */
dev->dev_state = MEI_DEV_INIT_CLIENTS;
mei_hbm_start_req(dev);
/* wake up all readings so they can be interrupted */
mei_cl_all_read_wakeup(dev);
/* remove all waiting requests */
mei_cl_all_write_clear(dev);
}
