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>

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");