mmc: sh_mobile_sdhi: check return value when changing clk

And return the old clock rate if something went wrong.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sh_mobile_sdhi.c b/drivers/mmc/host/sh_mobile_sdhi.c
index ac9ba36da39b5b56dfa4799298b0579a280cd6f8..5309c73be1f04fcffdea426519d37a5cfedbeb1e 100644 (file)
--- a/drivers/mmc/host/sh_mobile_sdhi.c
+++ b/drivers/mmc/host/sh_mobile_sdhi.c
@@ -166,7 +166,7 @@ static unsigned int sh_mobile_sdhi_clk_update(struct tmio_mmc_host *host,
 {
        struct sh_mobile_sdhi *priv = host_to_priv(host);
        unsigned int freq, diff, best_freq = 0, diff_min = ~0;
-       int i;
+       int i, ret;
 
        /* tested only on RCar Gen2+ currently; may work for others */
        if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
@@ -195,9 +195,9 @@ static unsigned int sh_mobile_sdhi_clk_update(struct tmio_mmc_host *host,
                }
        }
 
-       clk_set_rate(priv->clk, best_freq);
+       ret = clk_set_rate(priv->clk, best_freq);
 
-       return best_freq;
+       return ret == 0 ? best_freq : clk_get_rate(priv->clk);
 }
 
 static void sh_mobile_sdhi_clk_disable(struct tmio_mmc_host *host)