提交 a2a1fed8 编写于 作者: S Seungwon Jeon 提交者: Ulf Hansson

mmc: dw_mmc: exynos: don't use if clock isn't available

Add checking whether the clock is valid.
Signed-off-by: NSeungwon Jeon <tgih.jun@samsung.com>
Acked-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NAlim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
上级 1a25b1b4
......@@ -127,9 +127,9 @@ 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);
host->bus_hz = rate / (priv->ciu_div + 1);
host->bus_hz /= (priv->ciu_div + 1);
return 0;
}
......@@ -232,8 +232,11 @@ 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 */
......
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