mmc: block: Enable runtime pm for mmc blkdevice

Once the mmc blkdevice is being probed, runtime pm will be enabled.
By using runtime autosuspend, the power save operations can be done
when request inactivity occurs for a certain time. Right now the
selected timeout value is set to 3 s. Obviously this value will likely
need to be configurable somehow since it needs to be trimmed depending
on the power save algorithm.

For SD-combo cards, we are still leaving the enablement of runtime PM
to the SDIO init sequence since it depends on the capabilities of the
SDIO func driver.

Moreover, when the blk device is being suspended, we make sure the device
will be runtime resumed. The reason for doing this is that we want the
host suspend sequence to be unaware of any runtime power save operations
done for the card in this phase. Thus it can just handle the suspend as
the card is fully powered from a runtime perspective.

Finally, this patch prepares to make it possible to move BKOPS handling
into the runtime callbacks for the mmc bus_ops. Thus IDLE BKOPS can be
accomplished.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 26 insertions, 6 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 80b05b280241..c900d2818aa7 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -34,6 +34,7 @@
 #include <linux/delay.h>
 #include <linux/capability.h>
 #include <linux/compat.h>
+#include <linux/pm_runtime.h>
 
 #include <linux/mmc/ioctl.h>
 #include <linux/mmc/card.h>
@@ -224,7 +225,7 @@ static ssize_t power_ro_lock_store(struct device *dev,
         md = mmc_blk_get(dev_to_disk(dev));
         card = md->queue.card;
 
-        mmc_claim_host(card->host);
+        mmc_get_card(card);
 
         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
                                 card->ext_csd.boot_ro_lock |
@@ -235,7 +236,7 @@ static ssize_t power_ro_lock_store(struct device *dev,
         else
                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 
-        mmc_release_host(card->host);
+        mmc_put_card(card);
 
         if (!ret) {
                 pr_info("%s: Locking boot partition ro until next power on\n",
@@ -522,7 +523,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 
         mrq.cmd = &cmd;
 
-        mmc_claim_host(card->host);
+        mmc_get_card(card);
 
         err = mmc_blk_part_switch(card, md);
         if (err)
@@ -599,7 +600,7 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
         }
 
 cmd_rel_host:
-        mmc_release_host(card->host);
+        mmc_put_card(card);
 
 cmd_done:
         mmc_blk_put(md);
@@ -1921,7 +1922,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 
         if (req && !mq->mqrq_prev->req)
                 /* claim host only for the first request */
-                mmc_claim_host(card->host);
+                mmc_get_card(card);
 
         ret = mmc_blk_part_switch(card, md);
         if (ret) {
@@ -1965,7 +1966,7 @@ out:
                  * In case sepecial request, there is no reentry to
                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
                  */
-                mmc_release_host(card->host);
+                mmc_put_card(card);
         return ret;
 }
 
@@ -2362,6 +2363,19 @@ static int mmc_blk_probe(struct mmc_card *card)
                 if (mmc_add_disk(part_md))
                         goto out;
         }
+
+        pm_runtime_set_autosuspend_delay(&card->dev, 3000);
+        pm_runtime_use_autosuspend(&card->dev);
+
+        /*
+         * Don't enable runtime PM for SD-combo cards here. Leave that
+         * decision to be taken during the SDIO init sequence instead.
+         */
+        if (card->type != MMC_TYPE_SD_COMBO) {
+                pm_runtime_set_active(&card->dev);
+                pm_runtime_enable(&card->dev);
+        }
+
         return 0;
 
  out:
@@ -2375,9 +2389,13 @@ static void mmc_blk_remove(struct mmc_card *card)
         struct mmc_blk_data *md = mmc_get_drvdata(card);
 
         mmc_blk_remove_parts(card, md);
+        pm_runtime_get_sync(&card->dev);
         mmc_claim_host(card->host);
         mmc_blk_part_switch(card, md);
         mmc_release_host(card->host);
+        if (card->type != MMC_TYPE_SD_COMBO)
+                pm_runtime_disable(&card->dev);
+        pm_runtime_put_noidle(&card->dev);
         mmc_blk_remove_req(md);
         mmc_set_drvdata(card, NULL);
 }
@@ -2389,6 +2407,7 @@ static int mmc_blk_suspend(struct mmc_card *card)
         struct mmc_blk_data *md = mmc_get_drvdata(card);
 
         if (md) {
+                pm_runtime_get_sync(&card->dev);
                 mmc_queue_suspend(&md->queue);
                 list_for_each_entry(part_md, &md->part, part) {
                         mmc_queue_suspend(&part_md->queue);
@@ -2412,6 +2431,7 @@ static int mmc_blk_resume(struct mmc_card *card)
                 list_for_each_entry(part_md, &md->part, part) {
                         mmc_queue_resume(&part_md->queue);
                 }
+                pm_runtime_put(&card->dev);
         }
         return 0;
 }