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>
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8be12e2839
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@ -571,6 +571,9 @@ static void uniphier_sd_set_clk_rate(struct uniphier_sd_priv *priv,
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val = UNIPHIER_SD_CLKCTL_DIV1024;
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val = UNIPHIER_SD_CLKCTL_DIV1024;
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tmp = readl(priv->regbase + UNIPHIER_SD_CLKCTL);
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tmp = readl(priv->regbase + UNIPHIER_SD_CLKCTL);
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if (tmp & UNIPHIER_SD_CLKCTL_SCLKEN &&
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(tmp & UNIPHIER_SD_CLKCTL_DIV_MASK) == val)
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return;
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/* stop the clock before changing its rate to avoid a glitch signal */
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/* stop the clock before changing its rate to avoid a glitch signal */
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tmp &= ~UNIPHIER_SD_CLKCTL_SCLKEN;
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tmp &= ~UNIPHIER_SD_CLKCTL_SCLKEN;
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@ -582,6 +585,8 @@ static void uniphier_sd_set_clk_rate(struct uniphier_sd_priv *priv,
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tmp |= UNIPHIER_SD_CLKCTL_SCLKEN;
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tmp |= UNIPHIER_SD_CLKCTL_SCLKEN;
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writel(tmp, priv->regbase + UNIPHIER_SD_CLKCTL);
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writel(tmp, priv->regbase + UNIPHIER_SD_CLKCTL);
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udelay(1000);
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}
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}
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static int uniphier_sd_set_ios(struct udevice *dev)
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static int uniphier_sd_set_ios(struct udevice *dev)
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@ -599,8 +604,6 @@ static int uniphier_sd_set_ios(struct udevice *dev)
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uniphier_sd_set_ddr_mode(priv, mmc);
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uniphier_sd_set_ddr_mode(priv, mmc);
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uniphier_sd_set_clk_rate(priv, mmc);
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uniphier_sd_set_clk_rate(priv, mmc);
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udelay(1000);
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return 0;
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return 0;
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}
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}
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