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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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