diff options
| author | Geert Uytterhoeven <geert+renesas@linux-m68k.org> | 2014-02-21 20:29:18 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-02-23 07:27:03 +0400 |
| commit | ba824d4971691a7f1f66429e378a08a95fbb5b79 (patch) | |
| tree | 24c54aa3d39da05a294e9a54044683d84631f771 /drivers/spi | |
| parent | ab98fcba962a57cee9fdb97aff2b25248c93cea5 (diff) | |
| download | linux-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')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 4 |
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) { |