[PATCH 2/7] mmc: dw_mmc: exynos: don't use if clock isn't available

[Seungwon Jeon <tgih.jun@samsung.com>]

Adds checking whether the clock is valid.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
---
 drivers/mmc/host/dw_mmc-exynos.c |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index a67e784..89aa019 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -117,7 +117,12 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
 static int dw_mci_exynos_setup_clock(struct dw_mci *host)
 {
 	struct dw_mci_exynos_priv_data *priv = host->priv;
-	unsigned long rate = clk_get_rate(host->ciu_clk);
+	unsigned long rate;
+
+	if (IS_ERR(host->ciu_clk))
+		rate = host->bus_hz;
+	else
+		rate = clk_get_rate(host->ciu_clk);
 
 	host->bus_hz = rate / (priv->ciu_div + 1);
 	return 0;
@@ -196,8 +201,11 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 		mci_writel(host, CLKSEL, priv->sdr_timing);
 	}
 
-	/* Don't care if wanted clock is zero */
-	if (!wanted)
+	/*
+	 * Don't care if wanted clock is zero or
+	 * ciu clock is unavailable
+	 */
+	if (!wanted || IS_ERR(host->ciu_clk))
 		return;
 
 	/* Guaranteed minimum frequency for cclkin */
-- 
1.7.4.1