diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 8817b5e7f953af3034046700a089a3c33b9fd6d9..ac6e3f8150f3e645143f78a0b525eb38712289aa 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -801,6 +801,20 @@ static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width) SDHCI_HOST_CONTROL); } +static int usdhc_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + struct sdhci_host *host = mmc_priv(mmc); + + /* + * i.MX uSDHC internally already uses a fixed optimized timing for + * DDR50, normally does not require tuning for DDR50 mode. + */ + if (host->timing == MMC_TIMING_UHS_DDR50) + return 0; + + return sdhci_execute_tuning(mmc, opcode); +} + static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val) { u32 reg; @@ -1330,6 +1344,12 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) writel(0x0, host->ioaddr + ESDHC_MIX_CTRL); writel(0x0, host->ioaddr + SDHCI_AUTO_CMD_STATUS); writel(0x0, host->ioaddr + ESDHC_TUNE_CTRL_STATUS); + + /* + * Link usdhc specific mmc_host_ops execute_tuning function, + * to replace the standard one in sdhci_ops. + */ + host->mmc_host_ops.execute_tuning = usdhc_execute_tuning; } if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING)