mmc: sdhci-spear: Implement suspend/resume

Suspend/Resume is missing from sdhci-spear driver. This patch adds
support for suspend/resume for this driver.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci-spear.c b/drivers/mmc/host/sdhci-spear.c
index 63cc8b6a1c9e..dee70b66305a 100644
--- a/drivers/mmc/host/sdhci-spear.c
+++ b/drivers/mmc/host/sdhci-spear.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/platform_device.h>
+#include <linux/pm.h>
 #include <linux/slab.h>
 #include <linux/mmc/host.h>
 #include <linux/mmc/sdhci-spear.h>
@@ -271,10 +272,49 @@ static int __devexit sdhci_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM
+static int sdhci_suspend(struct device *dev)
+{
+        struct sdhci_host *host = dev_get_drvdata(dev);
+        struct spear_sdhci *sdhci = dev_get_platdata(dev);
+        pm_message_t state = {.event = 0};
+        int ret;
+
+        ret = sdhci_suspend_host(host, state);
+        if (!ret)
+                clk_disable(sdhci->clk);
+
+        return ret;
+}
+
+static int sdhci_resume(struct device *dev)
+{
+        struct sdhci_host *host = dev_get_drvdata(dev);
+        struct spear_sdhci *sdhci = dev_get_platdata(dev);
+        int ret;
+
+        ret = clk_enable(sdhci->clk);
+        if (ret) {
+                dev_dbg(dev, "Resume: Error enabling clock\n");
+                return ret;
+        }
+
+        return sdhci_resume_host(host);
+}
+
+const struct dev_pm_ops sdhci_pm_ops = {
+        .suspend        = sdhci_suspend,
+        .resume         = sdhci_resume,
+};
+#endif
+
 static struct platform_driver sdhci_driver = {
         .driver = {
                 .name   = "sdhci",
                 .owner  = THIS_MODULE,
+#ifdef CONFIG_PM
+                .pm     = &sdhci_pm_ops,
+#endif
         },
         .probe          = sdhci_probe,
         .remove         = __devexit_p(sdhci_remove),