[5/5] spi: lpspi: CLK pin becomes low when CR_RST=1

Commit Message

Clark Wang Oct. 24, 2018, 2:50 a.m. UTC

Remove Reset operation in fsl_lpspi_config(). This RST may cause both CLK
and CS pins go from high to low level under cs-gpio mode.
Add fsl_lpspi_reset() function after one message transfer to clear all
flags in use.

Signed-off-by: Xiaoning Wang <[e-mail]>
Reviewed-by: Fugang Duan <[e-mail]>
---
 drivers/spi/spi-fsl-lpspi.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

Patch

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index a8a6699e2741..844b713553d1 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -281,10 +281,6 @@  static int fsl_lpspi_config(struct fsl_lpspi_data *fsl_lpspi)
 	u32 temp;
 	int ret;
 
-	temp = CR_RST;
-	writel(temp, fsl_lpspi->base + IMX7ULP_CR);
-	writel(0, fsl_lpspi->base + IMX7ULP_CR);
-
 	if (!fsl_lpspi->is_slave) {
 		ret = fsl_lpspi_set_bitrate(fsl_lpspi);
 		if (ret)
@@ -375,6 +371,21 @@  static int fsl_lpspi_wait_for_completion(struct spi_controller *controller)
 	return 0;
 }
 
+static int fsl_lpspi_reset(struct fsl_lpspi_data *fsl_lpspi)
+{
+	u32 temp;
+
+	/* W1C for all flags in SR */
+	temp = 0x3F << 8;
+	writel(temp, fsl_lpspi->base + IMX7ULP_SR);
+
+	/* Clear FIFO and disable module */
+	temp = CR_RRF | CR_RTF;
+	writel(temp, fsl_lpspi->base + IMX7ULP_CR);
+
+	return 0;
+}
+
 static int fsl_lpspi_transfer_one(struct spi_controller *controller,
 				  struct spi_device *spi,
 				  struct spi_transfer *t)
@@ -396,9 +407,7 @@  static int fsl_lpspi_transfer_one(struct spi_controller *controller,
 	if (ret)
 		return ret;
 
-	ret = fsl_lpspi_txfifo_empty(fsl_lpspi);
-	if (ret)
-		return ret;
+	fsl_lpspi_reset(fsl_lpspi);
 
 	return 0;
 }