On 20/12/18 1:57 PM, BOUGH CHEN wrote:
> The bit ESDHC_STD_TUNING_EN may be configed by bootloader code if it
> choose to use standard tuning method. So on linux side, if choose to
> use manual tuning method, need to clear the bit ESDHC_STD_TUNING_EN,
> remove the impact of bootloader code.
>
> Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-esdhc-imx.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 75a2484..4b7bf07 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -1137,6 +1137,15 @@ static void sdhci_esdhc_imx_hwinit(struct sdhci_host *host)
> << ESDHC_TUNING_STEP_SHIFT;
> }
> writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
> + } else if (imx_data->socdata->flags & ESDHC_FLAG_MAN_TUNING) {
> + /*
> + * ESDHC_STD_TUNING_EN may be configed in bootloader
> + * or ROM code, so clear this bit here to make sure
> + * the manual tuning can work.
> + */
> + tmp = readl(host->ioaddr + ESDHC_TUNING_CTRL);
> + tmp &= ~ESDHC_STD_TUNING_EN;
> + writel(tmp, host->ioaddr + ESDHC_TUNING_CTRL);
> }
> }
> }
>
