Merge branch 'amba' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm

* 'amba' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm:
  ARM: 7079/1: spi: Fix builderror in spi-pl022.c
  PM: add runtime PM support to MMCI
  PM: add runtime PM support to core Primecell driver

3 files changed, 116 insertions, 37 deletions

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index d74926e0939e..84bdaace56c8 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -365,6 +365,40 @@ static int amba_pm_restore_noirq(struct device *dev)
 
 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
+#ifdef CONFIG_PM_RUNTIME
+/*
+ * Hooks to provide runtime PM of the pclk (bus clock).  It is safe to
+ * enable/disable the bus clock at runtime PM suspend/resume as this
+ * does not result in loss of context.  However, disabling vcore power
+ * would do, so we leave that to the driver.
+ */
+static int amba_pm_runtime_suspend(struct device *dev)
+{
+        struct amba_device *pcdev = to_amba_device(dev);
+        int ret = pm_generic_runtime_suspend(dev);
+
+        if (ret == 0 && dev->driver)
+                clk_disable(pcdev->pclk);
+
+        return ret;
+}
+
+static int amba_pm_runtime_resume(struct device *dev)
+{
+        struct amba_device *pcdev = to_amba_device(dev);
+        int ret;
+
+        if (dev->driver) {
+                ret = clk_enable(pcdev->pclk);
+                /* Failure is probably fatal to the system, but... */
+                if (ret)
+                        return ret;
+        }
+
+        return pm_generic_runtime_resume(dev);
+}
+#endif
+
 #ifdef CONFIG_PM
 
 static const struct dev_pm_ops amba_pm = {
@@ -383,8 +417,8 @@ static const struct dev_pm_ops amba_pm = {
         .poweroff_noirq = amba_pm_poweroff_noirq,
         .restore_noirq  = amba_pm_restore_noirq,
         SET_RUNTIME_PM_OPS(
-                pm_generic_runtime_suspend,
-                pm_generic_runtime_resume,
+                amba_pm_runtime_suspend,
+                amba_pm_runtime_resume,
                 pm_generic_runtime_idle
         )
 };
@@ -494,10 +528,18 @@ static int amba_probe(struct device *dev)
                 if (ret)
                         break;
 
+                pm_runtime_get_noresume(dev);
+                pm_runtime_set_active(dev);
+                pm_runtime_enable(dev);
+
                 ret = pcdrv->probe(pcdev, id);
                 if (ret == 0)
                         break;
 
+                pm_runtime_disable(dev);
+                pm_runtime_set_suspended(dev);
+                pm_runtime_put_noidle(dev);
+
                 amba_put_disable_pclk(pcdev);
                 amba_put_disable_vcore(pcdev);
         } while (0);
@@ -509,7 +551,16 @@ static int amba_remove(struct device *dev)
 {
         struct amba_device *pcdev = to_amba_device(dev);
         struct amba_driver *drv = to_amba_driver(dev->driver);
-        int ret = drv->remove(pcdev);
+        int ret;
+
+        pm_runtime_get_sync(dev);
+        ret = drv->remove(pcdev);
+        pm_runtime_put_noidle(dev);
+
+        /* Undo the runtime PM settings in amba_probe() */
+        pm_runtime_disable(dev);
+        pm_runtime_set_suspended(dev);
+        pm_runtime_put_noidle(dev);
 
         amba_put_disable_pclk(pcdev);
         amba_put_disable_vcore(pcdev);
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 56e9a4168264..5e142b7f5ecf 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -29,6 +29,7 @@
 #include <linux/dmaengine.h>
 #include <linux/dma-mapping.h>
 #include <linux/amba/mmci.h>
+#include <linux/pm_runtime.h>
 
 #include <asm/div64.h>
 #include <asm/io.h>
@@ -170,6 +171,7 @@ mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
          * back into the driver...
          */
         spin_unlock(&host->lock);
+        pm_runtime_put(mmc_dev(host->mmc));
         mmc_request_done(host->mmc, mrq);
         spin_lock(&host->lock);
 }
@@ -984,6 +986,8 @@ static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
                 return;
         }
 
+        pm_runtime_get_sync(mmc_dev(mmc));
+
         spin_lock_irqsave(&host->lock, flags);
 
         host->mrq = mrq;
@@ -1327,6 +1331,8 @@ static int __devinit mmci_probe(struct amba_device *dev,
 
         mmci_dma_setup(host);
 
+        pm_runtime_put(&dev->dev);
+
         mmc_add_host(mmc);
 
         return 0;
@@ -1364,6 +1370,12 @@ static int __devexit mmci_remove(struct amba_device *dev)
         if (mmc) {
                 struct mmci_host *host = mmc_priv(mmc);
 
+                /*
+                 * Undo pm_runtime_put() in probe.  We use the _sync
+                 * version here so that we can access the primecell.
+                 */
+                pm_runtime_get_sync(&dev->dev);
+
                 mmc_remove_host(mmc);
 
                 writel(0, host->base + MMCIMASK0);
diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 730b4a37b823..3520cf955b95 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -515,9 +515,6 @@ static void giveback(struct pl022 *pl022)
         if (msg->complete)
                 msg->complete(msg->context);
         /* This message is completed, so let's turn off the clocks & power */
-        clk_disable(pl022->clk);
-        amba_pclk_disable(pl022->adev);
-        amba_vcore_disable(pl022->adev);
         pm_runtime_put(&pl022->adev->dev);
 }
 
@@ -1545,9 +1542,6 @@ static void pump_messages(struct work_struct *work)
          * (poll/interrupt/DMA)
          */
         pm_runtime_get_sync(&pl022->adev->dev);
-        amba_vcore_enable(pl022->adev);
-        amba_pclk_enable(pl022->adev);
-        clk_enable(pl022->clk);
         restore_state(pl022);
         flush(pl022);
 
@@ -2186,8 +2180,6 @@ pl022_probe(struct amba_device *adev, const struct amba_id *id)
         }
         printk(KERN_INFO "pl022: mapped registers from 0x%08x to %p\n",
                adev->res.start, pl022->virtbase);
-        pm_runtime_enable(dev);