[PATCH] Enable runtime pm support for block driver of mmc stack.

[Yunpeng Gao]

Follow the kernel runtime pm framework, this patch enable
runtime pm support for block driver of mmc stack.
To validate it, it needs runtime pm support for mmc bus
and host controller to be enabled also.

Signed-off-by: Yunpeng Gao <yunpeng.gao@xxxxxxxxx>
---
 drivers/mmc/card/block.c |   24 +++++++++++++++++++++---
 1 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 217f820..8a35814 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -31,6 +31,7 @@
 #include <linux/mutex.h>
 #include <linux/scatterlist.h>
 #include <linux/string_helpers.h>
+#include <linux/pm_runtime.h>
 
 #include <linux/mmc/card.h>
 #include <linux/mmc/host.h>
@@ -560,14 +561,24 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 
 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 {
+	struct mmc_blk_data *md = mq->data;
+	struct mmc_card *card = md->queue.card;
+	int ret;
+
+	pm_runtime_get_sync(&card->dev);
+
 	if (req->cmd_flags & REQ_DISCARD) {
 		if (req->cmd_flags & REQ_SECURE)
-			return mmc_blk_issue_secdiscard_rq(mq, req);
+			ret = mmc_blk_issue_secdiscard_rq(mq, req);
 		else
-			return mmc_blk_issue_discard_rq(mq, req);
+			ret = mmc_blk_issue_discard_rq(mq, req);
 	} else {
-		return mmc_blk_issue_rw_rq(mq, req);
+		ret = mmc_blk_issue_rw_rq(mq, req);
 	}
+
+	pm_runtime_put(&card->dev);
+
+	return ret;
 }
 
 static inline int mmc_blk_readonly(struct mmc_card *card)
@@ -709,6 +720,11 @@ static int mmc_blk_probe(struct mmc_card *card)
 
 	mmc_set_drvdata(card, md);
 	add_disk(md->disk);
+
+	/* Indicate to runtime PM core that our device is active */
+	pm_runtime_set_active(&card->dev);
+	pm_runtime_enable(&card->dev);
+
 	return 0;
 
  out:
@@ -732,6 +748,8 @@ static void mmc_blk_remove(struct mmc_card *card)
 		mmc_blk_put(md);
 	}
 	mmc_set_drvdata(card, NULL);
+
+	pm_runtime_disable(&card->dev);
 }
 
 #ifdef CONFIG_PM
-- 
1.6.6.1

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