From: Geert Uytterhoeven <geert+rene...@linux-m68k.org>
While normal Dual and Quad SPI Transfers are unidirectional, we must do
a bidirectional transfer if loopback mode is enabled, else rx_buf is not
filled.
With spidev it seemed to work, as spidev uses the same buffer for
tranmission and reception.
Signed-off-by: Geert Uytterhoeven <geert+rene...@linux-m68k.org>
---
drivers/spi/spi-rspi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 4a1f978c3381..92bec7e91046 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -859,7 +859,9 @@ static int qspi_transfer_one(struct spi_master *master,
struct spi_device *spi,
{
struct rspi_data *rspi = spi_master_get_devdata(master);
- if (xfer->tx_buf && xfer->tx_nbits > SPI_NBITS_SINGLE) {
+ if (spi->mode & SPI_LOOP) {
+ return qspi_transfer_out_in(rspi, xfer);
+ } else if (xfer->tx_buf && xfer->tx_nbits > SPI_NBITS_SINGLE) {
/* Quad or Dual SPI Write */
return qspi_transfer_out(rspi, xfer);
} else if (xfer->rx_buf && xfer->rx_nbits > SPI_NBITS_SINGLE) {
--
1.7.9.5
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