diff mbox

[LTSI-3.14,101/894] spi: rspi: Fix loopback mode for Dual/Quad SPI Transfers

Message ID 1409209620-24487-102-git-send-email-horms+renesas@verge.net.au (mailing list archive)
State New, archived
Headers show

Commit Message

Simon Horman Aug. 28, 2014, 6:53 a.m. UTC 
From: Geert Uytterhoeven <geert+renesas@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+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit ba824d4971691a7f1f66429e378a08a95fbb5b79)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/spi/spi-rspi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox

Patch

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 4a1f978..92bec7e 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) {