From: Jaehoon Chung <jh80.chung@samsung.com>
To: Jean-Michel Hautbois <jean-michel.hautbois@vodalys.com>,
linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org
Cc: tgih.jun@samsung.com, ulf.hansson@linaro.org, chris@printf.net
Subject: Re: [PATCH] mmc: Add delay between CMD6 and CMD13 for Sandisk eMMC cards
Date: Thu, 11 Sep 2014 11:38:33 +0900 [thread overview]
Message-ID: <54110B29.7030303@samsung.com> (raw)
In-Reply-To: <1410265614-3275-1-git-send-email-jean-michel.hautbois@vodalys.com>
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.
>
next prev parent reply other threads:[~2014-09-11 2:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-09 12:26 [PATCH] mmc: Add delay between CMD6 and CMD13 for Sandisk eMMC cards Jean-Michel Hautbois
2014-09-11 2:38 ` Jaehoon Chung [this message]
2014-09-15 10:08 ` Jean-Michel Hautbois
2014-09-15 10:44 ` Jaehoon Chung
2014-09-15 10:53 ` Jean-Michel Hautbois
2014-09-15 11:29 ` Jean-Michel Hautbois
2014-09-16 0:53 ` hisanao.kinkawa
2014-09-21 17:48 ` Pavel Machek
2014-09-22 2:59 ` Jaehoon Chung
2014-09-22 7:23 ` Jean-Michel Hautbois
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