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Date: Mon, 15 Sep 2014 12:08:47 +0200 From: Jean-Michel Hautbois <jean-michel.hautbois@...alys.com> To: Jaehoon Chung <jh80.chung@...sung.com> Cc: linux-kernel <linux-kernel@...r.kernel.org>, "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>, "tgih.jun@...sung.com" <tgih.jun@...sung.com>, Ulf Hansson <ulf.hansson@...aro.org>, Chris Ball <chris@...ntf.net> Subject: Re: [PATCH] mmc: Add delay between CMD6 and CMD13 for Sandisk eMMC cards Hi Jaehoon, > 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. Yes >> >> Signed-off-by: Jean-Michel Hautbois <jean-michel.hautbois@...alys.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? Well, this is difficult to verify, I know that on all my SDIN5D1-2G I have this MANFID different from what is defined by CID_MANFID_SANDISK. How should I use MMC_FIXUP ? Like this ? MMC_FIXUP("SEM02G", 0x45, CID_OEMID_ANY, add_quirk, MMC_QUIRK_INAND_CMD13) ? If so, can I use : if (card->quirks & MMC_QUIRK_INAND_CMD38) msleep(1); In drivers/mmc/core/mmc_ops.c ? Is this the good way ? Thanks, JM -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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