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

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Add checking whether the clock is valid.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Seungwon Jeon 2014-12-22 17:42:03 +05:30 committed by Ulf Hansson
parent 1a25b1b419
commit a2a1fed8ea
1 changed files with 7 additions and 4 deletions
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11
drivers/mmc/host/dw_mmc-exynos.c
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@ -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 */