Hi Raffaele,
On Thu, Mar 10, 2011 at 11:43 PM, Raffaele Recalcati
<lamiapost...@gmail.com> wrote:
> From: Raffaele Recalcati <raffaele.recalc...@bticino.it>
>
> The first SEND_OP_COND (CMD1) is used only to ask card capabilities, waiting
> that the card is not busy.
> After it, an AND operation is done between card capabilities and host
> capabilities, (at the moment only for the voltage field).
> Finally the correct value is sent to the MMC.
>
> Signed-off-by: Raffaele Recalcati <raffaele.recalc...@bticino.it>
> ---
> drivers/mmc/mmc.c | 21 +++++++++++++++++++--
> include/mmc.h | 2 ++
> 2 files changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
> index 042653f..ded630b 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -347,17 +347,34 @@ sd_send_op_cond(struct mmc *mmc)
>
> int mmc_send_op_cond(struct mmc *mmc)
> {
> - int timeout = 1000;
> + int timeout = 10000;
> struct mmc_cmd cmd;
> int err;
>
> /* Some cards seem to need this */
> mmc_go_idle(mmc);
>
> + /* Asking to the card its capabilities */
> + do {
> + cmd.cmdidx = MMC_CMD_SEND_OP_COND;
> + cmd.resp_type = MMC_RSP_R3;
> + cmd.cmdarg = 0;
> + cmd.flags = 0;
> +
> + err = mmc_send_cmd(mmc, &cmd, NULL);
> +
> + if (err)
> + return err;
> +
> + udelay(1000);
> + } while (!(cmd.response[0] & OCR_BUSY) && timeout--);
I think you should not put the first probe a multi-time. In linux framework,
it would skip the first probing.
I test with this patch and fail to detect my emmc card...
While just let the first probe once, it works fine.
Best regards,
Lei
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