[U-Boot] [PATCH] mmc: send CMD0 before CMD1 for some MMC cards

[Yangbo Lu]

Any comments?
Thanks.


Best regards,
Yangbo Lu

> -----Original Message-----
> From: Yangbo Lu [mailto:yangbo.lu at nxp.com]
> Sent: Wednesday, March 09, 2016 11:00 AM
> To: u-boot at lists.denx.de
> Cc: Pantelis Antoniou; Yangbo Lu
> Subject: [PATCH] mmc: send CMD0 before CMD1 for some MMC cards
> 
> When the MMC framework was added in u-boot, the mmc_go_idle was added
> before mmc_send_op_cond_iter in function mmc_send_op_cond annotating that
> some cards seemed to need this. Actually, we still need to do this in
> function mmc_complete_op_cond for those cards.
> This has been verified on Micron MTFC4GACAECN eMMC chip.
> 
> Signed-off-by: Yangbo Lu <yangbo.lu at nxp.com>
> ---
>  drivers/mmc/mmc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index ede5d6e..82e3268
> 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -418,6 +418,9 @@ static int mmc_complete_op_cond(struct mmc *mmc)
>  	uint start;
>  	int err;
> 
> +	/* Some cards seem to need this */
> +	mmc_go_idle(mmc);
> +
>  	mmc->op_cond_pending = 0;
>  	if (!(mmc->ocr & OCR_BUSY)) {
>  		start = get_timer(0);
> --
> 2.1.0.27.g96db324