Messages in this thread | | | Date | Thu, 11 Sep 2014 11:38:33 +0900 | From | Jaehoon Chung <> | Subject | Re: [PATCH] mmc: Add delay between CMD6 and CMD13 for Sandisk eMMC cards |
| |
Hi,
On 09/09/2014 09:26 PM, Jean-Michel Hautbois wrote: > Tested on a i.MX6 board, with Sandisk SDIN5D1-2G. > Without this patch, I/O errors occur. > This eMMC seems to have a different Manufacturer ID as it reads 0x45 > and not 0x2 as specified in datasheet.
I think this patch don't merge into mainline. This is not solution for problem. you mentioned the below comment, this is workaround.
> > Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com> > --- > drivers/mmc/core/mmc_ops.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c > index f51b5ba..91babaa 100644 > --- a/drivers/mmc/core/mmc_ops.c > +++ b/drivers/mmc/core/mmc_ops.c > @@ -458,6 +458,15 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, > if (!use_busy_signal) > return 0; > > + /* WORKAROUND: for Sandisk eMMC cards, it might need certain delay > + * before sending CMD13 after CMD6 > + * On SDIN5D1-2G MANFID is 0x45 and not 0x2 as specified in datasheet > + */ > + if (card->cid.manfid == CID_MANFID_SANDISK || > + card->cid.manfid == 0x45) { > + msleep(1); > + }
If it's a general problem of Sandisk SDIN5D1-2G, I think you need to verify this problem. And can you use the MMC_FIXUP() and QUIRK?
Best Regards, Jaehoon Chung
> + > /* > * CRC errors shall only be ignored in cases were CMD13 is used to poll > * to detect busy completion. >
| |