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mei: add function to check write queues 

The driver needs to check whether the write
queue idle before entering power gating

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2014-03-18 22:52:01 +02:00 committed by Greg Kroah-Hartman
parent ba9cdd0e1a
commit a532bbedc8
2 changed files with 23 additions and 0 deletions
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21
drivers/misc/mei/init.c
View File

@ -303,7 +303,28 @@ void mei_stop(struct mei_device *dev)
}
EXPORT_SYMBOL_GPL(mei_stop);
/**
* mei_write_is_idle - check if the write queues are idle
*
* @dev: the device structure
*
* returns true of there is no pending write
*/
bool mei_write_is_idle(struct mei_device *dev)
{
bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
list_empty(&dev->ctrl_wr_list.list) &&
list_empty(&dev->write_list.list));
dev_dbg(&dev->pdev->dev, "write pg: is idle[%d] state=%s ctrl=%d write=%d\n",
idle,
mei_dev_state_str(dev->dev_state),
list_empty(&dev->ctrl_wr_list.list),
list_empty(&dev->write_list.list));
return idle;
}
EXPORT_SYMBOL_GPL(mei_write_is_idle);
void mei_device_init(struct mei_device *dev)
{

2
drivers/misc/mei/mei_dev.h
View File

@ -680,6 +680,8 @@ static inline int mei_count_full_read_slots(struct mei_device *dev)
bool mei_hbuf_acquire(struct mei_device *dev);
bool mei_write_is_idle(struct mei_device *dev);
#if IS_ENABLED(CONFIG_DEBUG_FS)
int mei_dbgfs_register(struct mei_device *dev, const char *name);
void mei_dbgfs_deregister(struct mei_device *dev);