[U-Boot] [PATCH] tegra: mmc: Set the bus width correctly

[Simon Glass]

Hi,

On 7 June 2017 at 22:03,  <Peter.Chubb at data61.csiro.au> wrote:
>>>>>> "Simon" == Simon Glass <sjg at chromium.org> writes:
>
> Simon> The driver currently does not reset bit 5 of the hostctl
> Simon> register even if the MMC stack requests it. Then means that
> Simon> once a bus width of 8 is selected it is not possible to change
> Simon> it back to 1. This breaks 'mmc rescan' which needs to start off
> Simon> with a bus width of 1.
>
> Simon> The problem was surfaced by enabling CONFIG_DM_MMC_OPS on
> Simon> tegra. Without this option the MMC stack fully reinits the
> Simon> driver on a 'mmc rescan'.  But with this option driver model
> Simon> does not re-probe a driver once it has been probed once.
>
> Simon> Fix the driver to honour the request.
>
> Simon> Signed-off-by: Simon Glass <sjg at chromium.org> ---
>
> Tested-by: Peter Chubb <peter.chubb at data61.csiro.au>
>
> Simon>  drivers/mmc/tegra_mmc.c | 2 +- 1 file changed, 1 insertion(+),
> Simon> 1 deletion(-)
>
> Simon> diff --git a/drivers/mmc/tegra_mmc.c b/drivers/mmc/tegra_mmc.c
> Simon> index 338e42b528..7d945a172e 100644 ---
> Simon> a/drivers/mmc/tegra_mmc.c +++ b/drivers/mmc/tegra_mmc.c @@
> Simon> -438,7 +438,7 @@ static int tegra_mmc_set_ios(struct udevice
> Simon> *dev) else if (mmc->bus_width == 4) ctrl |= (1 << 1); else -
> Simon> ctrl &= ~(1 << 1); + ctrl &= ~(1 << 1 | 1 << 5);
>
> Simon>          writeb(ctrl, &priv->reg->hostctl); debug("mmc_set_ios:
> Simon> hostctl = %08X\n", ctrl); -- 2.13.0.506.g27d5fe0cd-goog

Thanks for testing this.

Tom please note this is a bug fix.

- Simon