Re: CMD7 failing on ATP & Transcend MMC cards

From: Russell King (rmk+lkml_at_arm.linux.org.uk)
Date: 10/03/05

  • Next message: Luben Tuikov: "Re: I request inclusion of SAS Transport Layer and AIC-94xx into the kernel" 
    Date:	Mon, 3 Oct 2005 15:02:52 +0100
To: Jarkko Lavinen <jarkko.lavinen@nokia.com>

    On Mon, Oct 03, 2005 at 04:54:45PM +0300, Jarkko Lavinen wrote:
    > So far, the problem occured only on ATP and Transcend cards when the card
    > have already been detected and then mmc_detect_change() is called to
    > check if any new cards have been inserted. After CMD2 the next card
    > select command CMD7 fails due to illegal command error.

    I'm not surprised. CMD2 is part way through the initialisation
    sequence, so no one should be sending a CMD7.

    After a CMD2, the next expected command is a CMD3 for MMC cards (maybe
    not SD cards).

    Given the code, I don't see how you can possibly be sending a CMD7
    before the initialisation has completed. You need to find out why
    a CMD7 is being sent after CMD2.

    > I got rid of the problem by simply adding call to mmc_check_cards()
    > at and of mmc_setup() function, which is perhaps an overkill. One could do
    > it also in mmc_rescan() after switching back to higher clock.

    This is not a fix. 

    -- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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  • Next message: Luben Tuikov: "Re: I request inclusion of SAS Transport Layer and AIC-94xx into the kernel"

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