Hi,
On Sat, Mar 05 2011, Linus Walleij wrote:
> From: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx>
>
> At power off, reset OCR mask to be the highest possible voltage
> supported for the current mmc host.
>
> This solves the re-initialization during the power up sequence.
> The voltage may have been decreased due to the card accepts a lower
> voltage than the voltage used during the initialization sequence.
> We need to reset the voltage to by the host highest possible value
> since according to specification the initialization must always be
> done at high voltage.
>
> Reviewed-by: Jonas Aberg <jonas.aberg@xxxxxxxxxxxxxx>
> Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx>
> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
> ---
> drivers/mmc/core/core.c | 7 +++++++
> 1 files changed, 7 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 2521794..b9d39ec 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -1002,6 +1002,13 @@ static void mmc_power_off(struct mmc_host *host)
> {
> host->ios.clock = 0;
> host->ios.vdd = 0;
> +
> + /*
> + * Reset ocr mask to be the highest possible voltage supported for
> + * this mmc host. This value will be used at next power up.
> + */
> + host->ocr = 1 << (fls(host->ocr_avail) - 1);
> +
> if (!mmc_host_is_spi(host)) {
> host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
> host->ios.chip_select = MMC_CS_DONTCARE;
Thanks, pushed to mmc-next for .39.
It would be good to hear more about whether you think this is a
regression, should have a stable@ tag, etc.
- Chris.
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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