mmc: sdhci-bcm2835: Actually enable the clock

We're currently using a fixed frequency clock specified in the DT, so
enabling is a no-op.  However, the RPi firmware-based clocks driver
can actually disable unused clocks, so when switching to use it we
ended up losing our MMC clock once all devices were probed.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-bcm2835.c b/drivers/mmc/host/sdhci-bcm2835.c
index 32f4046546b59210c3e783257d3f520602d301e4..1c65d4690e7027f734ceaa8ae95e9e1b5c07b25f 100644 (file)
--- a/drivers/mmc/host/sdhci-bcm2835.c
+++ b/drivers/mmc/host/sdhci-bcm2835.c
@@ -172,12 +172,19 @@ static int bcm2835_sdhci_probe(struct platform_device *pdev)
                ret = PTR_ERR(pltfm_host->clk);
                goto err;
        }
+       ret = clk_prepare_enable(pltfm_host->clk);
+       if (ret) {
+               dev_err(&pdev->dev, "failed to enable host clk\n");
+               goto err;
+       }
 
        ret = sdhci_add_host(host);
        if (ret)
-               goto err;
+               goto err_clk;
 
        return 0;
+err_clk:
+       clk_disable_unprepare(pltfm_host->clk);
 err:
        sdhci_pltfm_free(pdev);
        return ret;