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    Subject[PATCH 3/5] Blackfin SPI: force sane state at boot
    Date
    From: Wolfgang Muees <wolfgang.mues@auerswald.de>

    We should make sure the SPI controller is in a sane state in case the
    boot loader left it in a crappy state. Such as DMA pending which causes
    interrupts to fire on us.

    Signed-off-by: Wolfgang Muees <wolfgang.mues@auerswald.de>
    Signed-off-by: Mike Frysinger <vapier@gentoo.org>
    ---
    drivers/spi/spi_bfin5xx.c | 6 ++++++
    1 files changed, 6 insertions(+), 0 deletions(-)

    diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
    index 5591bce..3249c5d 100644
    --- a/drivers/spi/spi_bfin5xx.c
    +++ b/drivers/spi/spi_bfin5xx.c
    @@ -1334,6 +1334,12 @@ static int __init bfin_spi_probe(struct platform_device *pdev)
    goto out_error_queue_alloc;
    }

    + /* Reset SPI registers. If these registers were used by the boot loader,
    + * the sky may fall on your head if you enable the dma controller.
    + */
    + write_CTRL(drv_data, 0x0400);
    + write_FLAG(drv_data, 0xFF00);
    +
    /* Register with the SPI framework */
    platform_set_drvdata(pdev, drv_data);
    status = spi_register_master(master);
    --
    1.6.5.rc1


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