On 11 September 2014 16:11, Stefan Roese <s...@denx.de> wrote:
> From: Thorsten Einsbein <thorsten.eisb...@head-acoustics.de>
>
> On the TAO3530 (OMAP3530 based) we noticed that some SD cards are not
> detected reliably upon bootup (timeout). Especially the SanDisk Ultra
> 8GiB seems to be problematic here. The SanDisk Extreme also has this
> problem on this platform, but not that often. A Samsung 8 GiB type 6
> doesn't show this problem at all.
>
> This patch now adds a short delay after enabling the power on the slot.
> With this delay all cards are detected reliably.
Is this delay related to regulator ramp up/down time? Then I think it
maybe should be a part of the regulator code/DT.
Kind regards
Uffe
>
> Signed-off-by: Thorsten Einsbein <thorsten.eisb...@head-acoustics.de>
> Signed-off-by: Stefan Roese <s...@denx.de>
> Cc: Ulf Hansson <ulf.hans...@linaro.org>
> Cc: Balaji T K <balaj...@ti.com>
> ---
> drivers/mmc/host/omap_hsmmc.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 9656726..62ff0a7 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -335,6 +335,10 @@ static int omap_hsmmc_set_power(struct device *dev, int
> slot, int power_on,
> ret = mmc_regulator_set_ocr(host->mmc,
> host->vcc, 0);
> }
> +
> + dev_dbg(host->dev, "omap_hsmmc_set_power: wait a little (slot
> %d)\n",
> + slot);
> + msleep(5);
> } else {
> /* Shut down the rail */
> if (host->vcc_aux)
> --
> 2.1.0
>
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
