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authorAlexander Usyskin <alexander.usyskin@intel.com>2015-10-13 15:02:38 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-10-18 07:45:05 +0300
commit34af19132ed77b51f84274c23cef4ed520542319 (patch)
treeaf776ab73b4d9a71b9341fd881ea735282dfd69d /drivers/misc
parent97ccf63f42721e758bb3cd1aa8967a89d26ed0bb (diff)
downloadlinux-34af19132ed77b51f84274c23cef4ed520542319.tar.xz
mei: keep the device awake during reads in chunks
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/mei/interrupt.c4
1 files changed, 4 insertions, 0 deletions
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: