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    mvsdio: fix config failure with some high speed SDHC cards · a6d297f0
    Nicolas Pitre 提交于
    Especially with Sandisk SDHC cards, the second SWITCH command was failing
    with a timeout and the card was not recognized at all.  However if the
    system was busy, or debugging was enabled, or a udelay(100) was inserted
    before the second SWITCH command in the core code, then the timing was
    so that the card started to work.
    
    With some unusual block sizes, the data FIFO status doesn't indicate a
    "empty" state right away when the data transfer is done.  Queuing
    another data transfer in that condition results in a transfer timeout.
    
    The empty FIFO bit eventually get set by itself in less than 50 usecs
    when it is not set right away. So let's just poll for that bit before
    configuring the controller with a new data transfer.
    Signed-off-by: NNicolas Pitre <nico@marvell.com>
    Signed-off-by: NPierre Ossman <pierre@ossman.eu>
    a6d297f0
mvsdio.c 25.0 KB