mmc: sdhci-s3c: fix missing clock for gpio card-detect

2abeb5c5ded2 ("Add clk_(enable/disable) in runtime suspend/resume")
added the capability to stop the clocks when the device is runtime
suspended, but forgot to handle the case of the card-detect using
an external gpio.

Therefore in the case that runtime-pm is enabled, start the io-clock
when a card is inserted and stop it again once it is removed.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index a54dd5d7a5f9..c9ec725884e5 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -373,18 +373,25 @@ static struct sdhci_ops sdhci_s3c_ops = {
 static void sdhci_s3c_notify_change(struct platform_device *dev, int state)
 {
         struct sdhci_host *host = platform_get_drvdata(dev);
+        struct sdhci_s3c *sc = sdhci_priv(host);
         unsigned long flags;
 
         if (host) {
                 spin_lock_irqsave(&host->lock, flags);
                 if (state) {
                         dev_dbg(&dev->dev, "card inserted.\n");
+#ifdef CONFIG_PM_RUNTIME
+                        clk_prepare_enable(sc->clk_io);
+#endif
                         host->flags &= ~SDHCI_DEVICE_DEAD;
                         host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
                 } else {
                         dev_dbg(&dev->dev, "card removed.\n");
                         host->flags |= SDHCI_DEVICE_DEAD;
                         host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION;
+#ifdef CONFIG_PM_RUNTIME
+                        clk_disable_unprepare(sc->clk_io);
+#endif
                 }
                 tasklet_schedule(&host->card_tasklet);
                 spin_unlock_irqrestore(&host->lock, flags);