Adds checking whether the clock is valid.
Signed-off-by: Seungwon Jeon <tgih.jun@xxxxxxxxxxx>
---
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
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