mmc: print debug messages for runtime PM actions

At http://www.mail-archive.com/linux-mmc@vger.kernel.org/msg08371.html
(thread: "mmc: sdio: reset card during power_restore") we found and
fixed a bug where mmc's runtime power management functions were not being
called. We have now also made improvements to the SDIO powerup routine
which could possibly mask this kind of issue in future.

Add debug messages to the runtime PM hooks so that it is easy to verify
if and when runtime PM is happening.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/core/core.c

@@ -1832,6 +1832,10 @@ int mmc_power_save_host(struct mmc_host *host)
 {
 	int ret = 0;
 
+#ifdef CONFIG_MMC_DEBUG
+	pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
+#endif
+
 	mmc_bus_get(host);
 
 	if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
@@ -1854,6 +1858,10 @@ int mmc_power_restore_host(struct mmc_host *host)
 {
 	int ret;
 
+#ifdef CONFIG_MMC_DEBUG
+	pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
+#endif
+
 	mmc_bus_get(host);
 
 	if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {