ARM: 7223/1: mmc: mmci: Fixup use of runtime PM and use autosuspend

Added use of runtime PM autosuspend feature, with a fixed
timeout of 50 ms. This will prevent adding a latency,
although very minor, for _every_ request.

Moreover the runtime_get_sync is now also used in set_ios and
suspend since the runtime resourses are needed here as well.

Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 16 insertions, 3 deletions

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 544995b3cb95..6a21fc0bf3d8 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -178,8 +178,10 @@ mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
         host->mrq = NULL;
         host->cmd = NULL;
 
-        pm_runtime_put(mmc_dev(host->mmc));
         mmc_request_done(host->mmc, mrq);
+
+        pm_runtime_mark_last_busy(mmc_dev(host->mmc));
+        pm_runtime_put_autosuspend(mmc_dev(host->mmc));
 }
 
 static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
@@ -1026,6 +1028,8 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         unsigned long flags;
         int ret;
 
+        pm_runtime_get_sync(mmc_dev(mmc));
+
         if (host->plat->ios_handler &&
                 host->plat->ios_handler(mmc_dev(mmc), ios))
                         dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
@@ -1046,7 +1050,7 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                                  * power should be rare so we print an error
                                  * and return here.
                                  */
-                                return;
+                                goto out;
                         }
                 }
                 /*
@@ -1100,6 +1104,10 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
         }
 
         spin_unlock_irqrestore(&host->lock, flags);
+
+ out:
+        pm_runtime_mark_last_busy(mmc_dev(mmc));
+        pm_runtime_put_autosuspend(mmc_dev(mmc));
 }
 
 static int mmci_get_ro(struct mmc_host *mmc)
@@ -1372,6 +1380,8 @@ static int __devinit mmci_probe(struct amba_device *dev,
 
         mmci_dma_setup(host);
 
+        pm_runtime_set_autosuspend_delay(&dev->dev, 50);
+        pm_runtime_use_autosuspend(&dev->dev);
         pm_runtime_put(&dev->dev);
 
         mmc_add_host(mmc);
@@ -1467,8 +1477,10 @@ static int mmci_suspend(struct device *dev)
                 struct mmci_host *host = mmc_priv(mmc);
 
                 ret = mmc_suspend_host(mmc);
-                if (ret == 0)
+                if (ret == 0) {
+                        pm_runtime_get_sync(dev);
                         writel(0, host->base + MMCIMASK0);
+                }
         }
 
         return ret;
@@ -1484,6 +1496,7 @@ static int mmci_resume(struct device *dev)
                 struct mmci_host *host = mmc_priv(mmc);
 
                 writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+                pm_runtime_put(dev);
 
                 ret = mmc_resume_host(mmc);
         }