mmc: sdhci-s3c: Check if clk_set_rate() succeeds

It is possible that we may fail to set the clock rate, if we do so then
log the failure and don't bother reprogramming the IP.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 0ce6eb17deaf..4f7a63213b33 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -300,6 +300,7 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
         struct device *dev = &ourhost->pdev->dev;
         unsigned long timeout;
         u16 clk = 0;
+        int ret;
 
         host->mmc->actual_clock = 0;
 
@@ -311,7 +312,12 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
 
         sdhci_s3c_set_clock(host, clock);
 
-        clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
+        ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
+        if (ret != 0) {
+                dev_err(dev, "%s: failed to set clock rate %uHz\n",
+                        mmc_hostname(host->mmc), clock);
+                return;
+        }
 
         clk = SDHCI_CLOCK_INT_EN;
         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);