The armada 3700 SPI controller allows to make transfers without using the 32 bytes RFIFO and WFIFO.
This commit enable switching between FIFO and non-FIFO mode, which is necessary to implement full-duplex transfers. Signed-off-by: Maxime Chevallier <[email protected]> --- drivers/spi/spi-armada-3700.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-armada-3700.c b/drivers/spi/spi-armada-3700.c index 8048468..b387309 100644 --- a/drivers/spi/spi-armada-3700.c +++ b/drivers/spi/spi-armada-3700.c @@ -186,12 +186,15 @@ static int a3700_spi_pin_mode_set(struct a3700_spi *a3700_spi, return 0; } -static void a3700_spi_fifo_mode_set(struct a3700_spi *a3700_spi) +static void a3700_spi_fifo_mode_set(struct a3700_spi *a3700_spi, bool enable) { u32 val; val = spireg_read(a3700_spi, A3700_SPI_IF_CFG_REG); - val |= A3700_SPI_FIFO_MODE; + if (enable) + val |= A3700_SPI_FIFO_MODE; + else + val &= ~A3700_SPI_FIFO_MODE; spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val); } @@ -299,7 +302,7 @@ static int a3700_spi_init(struct a3700_spi *a3700_spi) a3700_spi_deactivate_cs(a3700_spi, i); /* Enable FIFO mode */ - a3700_spi_fifo_mode_set(a3700_spi); + a3700_spi_fifo_mode_set(a3700_spi, true); /* Set SPI mode */ a3700_spi_mode_set(a3700_spi, master->mode_bits); -- 2.1.4
