Messages in this thread Patch in this message | | | From | Mike Frysinger <> | Subject | [PATCH 3/5] Blackfin SPI: force sane state at boot | Date | Thu, 17 Sep 2009 19:47:51 -0400 |
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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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