Messages in this thread Patch in this message | | | From | Tomas Winkler <> | Subject | [char-misc-next 07/13] mei: add function to check write queues | Date | Tue, 18 Mar 2014 22:52:01 +0200 |
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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> --- drivers/misc/mei/init.c | 21 +++++++++++++++++++++ drivers/misc/mei/mei_dev.h | 2 ++ 2 files changed, 23 insertions(+)
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c index 4b1eb37..abc5ea0 100644 --- a/drivers/misc/mei/init.c +++ b/drivers/misc/mei/init.c @@ -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) { diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index bec6ade..fe76e5b 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -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); -- 1.8.5.3
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