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[char-misc-next 2/5] mei: keep the device awake during reads in chunks

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From: Alexander Usyskin <alexander.usyskin@intel.com>

Long messages are read in chunks, to prevent trashing runtime pm between
the reading of the chunks we call pm_runtime_mark_last_busy() on
non-final chunk message as the next chunk of the same message will be
received immediately in the next interrupt with high probablity.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/interrupt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index c418d7888994..64b568a0268d 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -21,6 +21,7 @@
 #include <linux/fs.h>
 #include <linux/jiffies.h>
 #include <linux/slab.h>
+#include <linux/pm_runtime.h>
 
 #include <linux/mei.h>
 
@@ -147,6 +148,9 @@ int mei_cl_irq_read_msg(struct mei_cl *cl,
 		cb->read_time = jiffies;
 		cl_dbg(dev, cl, "completed read length = %lu\n", cb->buf_idx);
 		list_move_tail(&cb->list, &complete_list->list);
+	} else {
+		pm_runtime_mark_last_busy(dev->dev);
+		pm_request_autosuspend(dev->dev);
 	}
 
 out:
-- 
2.4.3

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[char-misc-next 2/5] mei: keep the device awake during reads in chunks Tomas Winkler <tomas.winkler@intel.com> - 2015-10-13 14:10 +0200

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