Commit ba824d49 authored Feb 21, 2014 by Geert Uytterhoeven Committed by Mark Brown Feb 23, 2014

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>

parent ab98fcba

drivers/spi/spi-rspi.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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) {