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Unverified Commit a456c932 authored by Maxime Chevallier's avatar Maxime Chevallier Committed by Mark Brown
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spi: a3700: Allow to enable or disable FIFO mode 



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: default avatarMaxime Chevallier <maxime.chevallier@smile.fr>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent abf3a49e

drivers/spi/spi-armada-3700.c

+6 −3
Original line number Diff line number Diff line
@@ -185,12 +185,15 @@ 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);

	if (enable)

		val |= A3700_SPI_FIFO_MODE;

	else

		val &= ~A3700_SPI_FIFO_MODE;

	spireg_write(a3700_spi, A3700_SPI_IF_CFG_REG, val);

}
@@ -291,7 +294,7 @@ 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);