summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--drivers/mmc/uniphier-sd.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/mmc/uniphier-sd.c b/drivers/mmc/uniphier-sd.c
index 40a5c85..701b26f 100644
--- a/drivers/mmc/uniphier-sd.c
+++ b/drivers/mmc/uniphier-sd.c
@@ -571,6 +571,9 @@ static void uniphier_sd_set_clk_rate(struct uniphier_sd_priv *priv,
val = UNIPHIER_SD_CLKCTL_DIV1024;
tmp = readl(priv->regbase + UNIPHIER_SD_CLKCTL);
+ if (tmp & UNIPHIER_SD_CLKCTL_SCLKEN &&
+ (tmp & UNIPHIER_SD_CLKCTL_DIV_MASK) == val)
+ return;
/* stop the clock before changing its rate to avoid a glitch signal */
tmp &= ~UNIPHIER_SD_CLKCTL_SCLKEN;
@@ -582,6 +585,8 @@ static void uniphier_sd_set_clk_rate(struct uniphier_sd_priv *priv,
tmp |= UNIPHIER_SD_CLKCTL_SCLKEN;
writel(tmp, priv->regbase + UNIPHIER_SD_CLKCTL);
+
+ udelay(1000);
}
static int uniphier_sd_set_ios(struct udevice *dev)
@@ -599,8 +604,6 @@ static int uniphier_sd_set_ios(struct udevice *dev)
uniphier_sd_set_ddr_mode(priv, mmc);
uniphier_sd_set_clk_rate(priv, mmc);
- udelay(1000);
-
return 0;
}