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path: root/drivers/mmc/host/mmci.c
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Diffstat (limited to 'drivers/mmc/host/mmci.c')
-rw-r--r--drivers/mmc/host/mmci.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 626ac083f4e..da5fecad74d 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -425,7 +425,7 @@ static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
host->cclk = host->mclk;
} else {
clk = host->mclk / (2 * ios->clock) - 1;
- if (clk > 256)
+ if (clk >= 256)
clk = 255;
host->cclk = host->mclk / (2 * (clk + 1));
}
@@ -512,6 +512,18 @@ static int mmci_probe(struct amba_device *dev, void *id)
host->plat = plat;
host->mclk = clk_get_rate(host->clk);
+ /*
+ * According to the spec, mclk is max 100 MHz,
+ * so we try to adjust the clock down to this,
+ * (if possible).
+ */
+ if (host->mclk > 100000000) {
+ ret = clk_set_rate(host->clk, 100000000);
+ if (ret < 0)
+ goto clk_disable;
+ host->mclk = clk_get_rate(host->clk);
+ DBG(host, "eventual mclk rate: %u Hz\n", host->mclk);
+ }
host->mmc = mmc;
host->base = ioremap(dev->res.start, SZ_4K);
if (!host->base) {