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spi: dspi: clear SPI_SR before enable interrupt 

Once dspi is used in uboot, the SPI_SR have been set by some value.
At this time, if kernel enable the interrupt before clear the
status flag, that will trigger the wrong interrupt.

Signed-off-by: Yuan Yao <yao.yuan@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Yuan Yao 2016-10-17 18:02:34 +08:00 committed by Mark Brown
parent 1001354ca3
commit 5ee67b587a
1 changed files with 7 additions and 0 deletions
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7
drivers/spi/spi-fsl-dspi.c
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@ -70,6 +70,7 @@
#define SPI_SR 0x2c
#define SPI_SR_EOQF 0x10000000
#define SPI_SR_TCFQF 0x80000000
#define SPI_SR_CLEAR 0xdaad0000
#define SPI_RSER 0x30
#define SPI_RSER_EOQFE 0x10000000
@ -646,6 +647,11 @@ static const struct regmap_config dspi_regmap_config = {
.max_register = 0x88,
};
static void dspi_init(struct fsl_dspi *dspi)
{
regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
}
static int dspi_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@ -709,6 +715,7 @@ static int dspi_probe(struct platform_device *pdev)
return PTR_ERR(dspi->regmap);
}
dspi_init(dspi);
dspi->irq = platform_get_irq(pdev, 0);
if (dspi->irq < 0) {
dev_err(&pdev->dev, "can't get platform irq\n");