Merge "mmc: host: Add device_prepare pm for mmc_host"

drivers/mmc/core/host.c

@@ -52,9 +52,28 @@ static void mmc_host_classdev_release(struct device *dev)
 	kfree(host);
 }
 
+static int mmc_host_prepare(struct device *dev)
+{
+	/*
+	 * Since mmc_host is a virtual device, we don't have to do anything.
+	 * If we return a positive value, the pm framework will consider that
+	 * the runtime suspend and system suspend of this device is same and
+	 * will set direct_complete flag as true. We don't want this as the
+	 * mmc_host always has positive disable_depth and setting the flag
+	 * will not speed up the suspend process.
+	 * So return 0.
+	 */
+	return 0;
+}
+
+static const struct dev_pm_ops mmc_pm_ops = {
+	.prepare = mmc_host_prepare,
+};
+
 static struct class mmc_host_class = {
 	.name		= "mmc_host",
 	.dev_release	= mmc_host_classdev_release,
+	.pm		= &mmc_pm_ops,
 };
 
 int mmc_register_host_class(void)