[U-Boot] [v2] mmc: send CMD0 before CMD1 for some MMC cards

[Yangbo Lu]

Hi Jaehoon,

Sure. And appreciate your good help :)


Best regards,
Yangbo Lu

> -----Original Message-----
> From: Jaehoon Chung [mailto:jh80.chung at samsung.com]
> Sent: Tuesday, August 09, 2016 7:06 AM
> To: Yangbo Lu; u-boot at lists.denx.de
> Subject: Re: [v2] mmc: send CMD0 before CMD1 for some MMC cards
> 
> Hi Yangbo,
> 
> On 08/02/2016 04:33 PM, Yangbo Lu wrote:
> > 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.
> 
> This patch is not bad.. but i need to verify more about entire sequence.
> Could you wait a bit?
> 
> Best Regards,
> Jaehoon Chung
> 
> >
> > 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
> > f8e5f7a..d4e96bc 100644
> > --- a/drivers/mmc/mmc.c
> > +++ b/drivers/mmc/mmc.c
> > @@ -422,6 +422,9 @@ static int mmc_complete_op_cond(struct mmc *mmc)
> >
> >  	mmc->op_cond_pending = 0;
> >  	if (!(mmc->ocr & OCR_BUSY)) {
> > +		/* Some cards seem to need this */
> > +		mmc_go_idle(mmc);
> > +
> >  		start = get_timer(0);
> >  		while (1) {
> >  			err = mmc_send_op_cond_iter(mmc, 1);
> >