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authorYuan Yao <yao.yuan@nxp.com>2016-10-17 18:02:34 +0800
committerMark Brown <broonie@kernel.org>2016-10-29 12:51:29 -0600
commit5ee67b587a2b0092bdea3123349c8c3c43e8e46e (patch)
treeef87489bfc36118b99e15e5ac42ff06f83baed0d /drivers/spi/spi-fsl-dspi.c
parent1001354ca34179f3db924eb66672442a173147dc (diff)
downloadlinux-5ee67b587a2b0092bdea3123349c8c3c43e8e46e.tar.bz2
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>
Diffstat (limited to 'drivers/spi/spi-fsl-dspi.c')
-rw-r--r--drivers/spi/spi-fsl-dspi.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 35c0dd945668..a67b0ff6a362 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -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");