spi: a3700: Clear DATA_OUT when performing a read

When performing a read using FIFO mode, the spi controller shifts out
the last 2 bytes that were written in a previous transfer on MOSI.

This undocumented behaviour can cause devices to misinterpret the
transfer, so we explicitly clear the WFIFO before each read.

This behaviour was noticed on EspressoBin.

Signed-off-by: Maxime Chevallier <maxime.chevallier@smile.fr>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/spi/spi-armada-3700.c b/drivers/spi/spi-armada-3700.c
index 77fe55ce790c..4857b0119556 100644
--- a/drivers/spi/spi-armada-3700.c
+++ b/drivers/spi/spi-armada-3700.c
@@ -607,6 +607,11 @@ static int a3700_spi_transfer_one(struct spi_master *master,
         a3700_spi_header_set(a3700_spi);
 
         if (xfer->rx_buf) {
+                /* Clear WFIFO, since it's last 2 bytes are shifted out during
+                 * a read operation
+                 */
+                spireg_write(a3700_spi, A3700_SPI_DATA_OUT_REG, 0);
+
                 /* Set read data length */
                 spireg_write(a3700_spi, A3700_SPI_IF_DIN_CNT_REG,
                              a3700_spi->buf_len);