diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index 9e34557d165a183948496eb1a59b8a97c3d7ec14..60972014c49a0598cee3042a446bdd30dadf0674 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -614,18 +614,31 @@ static void set_sysctl(struct fsl_esdhc_priv *priv, struct mmc *mmc, uint clock) #else int pre_div = 2; #endif - int ddr_pre_div = mmc->ddr_mode ? 2 : 1; int sdhc_clk = priv->sdhc_clk; uint clk; + /* + * For ddr mode, usdhc need to enable DDR mode first, after select + * this DDR mode, usdhc will automatically divide the usdhc clock + */ + if (mmc->ddr_mode) { + writel(readl(®s->mixctrl) | MIX_CTRL_DDREN, ®s->mixctrl); + sdhc_clk >>= 1; + } + if (clock < mmc->cfg->f_min) clock = mmc->cfg->f_min; - while (sdhc_clk / (16 * pre_div * ddr_pre_div) > clock && pre_div < 256) - pre_div *= 2; + if (sdhc_clk / 16 > clock) { + for (; pre_div < 256; pre_div *= 2) + if ((sdhc_clk / pre_div) <= (clock * 16)) + break; + } else + pre_div = 1; - while (sdhc_clk / (div * pre_div * ddr_pre_div) > clock && div < 16) - div++; + for (div = 1; div <= 16; div++) + if ((sdhc_clk / (div * pre_div)) <= clock) + break; pre_div >>= 1; div -= 1;