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mmc: uniphier-sd: just return if already set to desired clock rate 

With this, we can save unnecessary udelay().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2016-08-25 14:52:38 +09:00
parent 8be12e2839
commit 4a89a24e26
1 changed files with 5 additions and 2 deletions
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7
drivers/mmc/uniphier-sd.c
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@ -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;
}