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authorGeert Uytterhoeven <geert+renesas@linux-m68k.org>2014-02-21 20:29:18 +0400
committerMark Brown <broonie@linaro.org>2014-02-23 07:27:03 +0400
commitba824d4971691a7f1f66429e378a08a95fbb5b79 (patch)
tree24c54aa3d39da05a294e9a54044683d84631f771 /drivers/spi/spi-rspi.c
parentab98fcba962a57cee9fdb97aff2b25248c93cea5 (diff)
downloadlinux-ba824d4971691a7f1f66429e378a08a95fbb5b79.tar.xz
spi: rspi: Fix loopback mode for Dual/Quad SPI Transfers
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>
Diffstat (limited to 'drivers/spi/spi-rspi.c')
-rw-r--r--drivers/spi/spi-rspi.c4
1 files changed, 3 insertions, 1 deletions
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) {