This reverts commit 72a89e0da5ac6a4ab929b15a2b656f04f50767f6, which causes the imx53 HSC to hang as the eMMC is not working properly anymore.
The exact error message: MMC write: dev # 0, block # 2, count 927 ... mmc write failed 0 blocks written: ERROR
imx53 is not using the DDR mode.
Debugging of pre_div and div generation showed that those values are generated in a way, which is not matching the ones from working setup.
As the original patch was performing code refactoring, let's revert this change, so all imx53 boards would work again.
Signed-off-by: Lukasz Majewski lukma@denx.de --- drivers/mmc/fsl_esdhc.c | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index 1b7de74a72..377b2673a3 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -621,31 +621,18 @@ 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;
- 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 / (16 * pre_div * ddr_pre_div) > clock && pre_div < 256) + pre_div *= 2;
- for (div = 1; div <= 16; div++) - if ((sdhc_clk / (div * pre_div)) <= clock) - break; + while (sdhc_clk / (div * pre_div * ddr_pre_div) > clock && div < 16) + div++;
pre_div >>= 1; div -= 1;