Re: [PATCH][MMC] Fix wrong EXT_CSD_REV handling

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On Dec 13, 2007 4:53 PM, Pierre Ossman <[email protected]> wrote:
> On Thu, 13 Dec 2007 16:13:11 +0900
> Kyungmin Park <[email protected]> wrote:
>
> > It already checked the ext_csd_struct is less than 2,
> > so it doesn't need to check it.
> > Current code only accepts the revision 1.2.
> >
> > Signed-off-by: Kyungmin Park <[email protected]>
>
> It wasn't wrong the last time you brought this up, and it still isn't wrong. Those bits aren't defined until version 1.2 of the EXT_CSD register, hence we do not trust them. If you have some broken card that you feel you must have support for, then start working on some quirks system.

Now see the code.

First, it checks the ext_csd_struct.
       ext_csd_struct = ext_csd[EXT_CSD_REV];
        if (ext_csd_struct > 2) {
                printk(KERN_ERR "%s: unrecognised EXT_CSD structure "
                        "version %d\n", mmc_hostname(card->host),
                        ext_csd_struct);
                err = -EINVAL;
                goto out;
        }
        => here possible values are 0, 1, 2

        => It only accepts the ext_csd 2 but my *broken* card has 1.
so it's failed.
        if (ext_csd_struct >= 2) {
                card->ext_csd.sectors =
                        ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
                        ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
                        ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
                        ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
                if (card->ext_csd.sectors)
                        mmc_card_set_blockaddr(card);
        }

In my MMC Spec. (v4.2), there's no problem to read it even though it's
revision 1.1

Anyway how do it handle this one? Do you have any idea?

Thank you,
Kyungmin Park
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