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authorSowjanya Komatineni <skomatineni@nvidia.com>2019-04-04 17:14:07 -0700
committerMark Brown <broonie@kernel.org>2019-04-08 14:11:58 +0700
commit9877a347f2056f7aa4e770de9a20048ad288f545 (patch)
tree21fa94a1c427ca3c95a0557b0af928301bbbf665 /drivers/spi
parent79567c1a321e7396e734135d56950311dde07db2 (diff)
downloadlinux-9877a347f2056f7aa4e770de9a20048ad288f545.tar.bz2
spi: tegra114: add dual mode support
This patch adds support for dual mode SPI transfer. Dual mode uses both MOSI and MISO lines in parallel where the data is interleaved on MOSI and MISO lines increasing the throughput. Packet from Tx FIFO is transmitted on both MOSI and MISO lines and packet to Rx FIFO is received from both MOSI and MISO lines. Even bits are transmitted or received on the MOSI data line and odd bits are transmitted or received on the MISO data line. Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-tegra114.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index 402799c7f6b7..1e749ce13029 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -786,6 +786,11 @@ static int tegra_spi_start_transfer_one(struct spi_device *spi,
total_fifo_words = tegra_spi_calculate_curr_xfer_param(spi, tspi, t);
+ if (t->rx_nbits == SPI_NBITS_DUAL || t->tx_nbits == SPI_NBITS_DUAL)
+ command1 |= SPI_BOTH_EN_BIT;
+ else
+ command1 &= ~SPI_BOTH_EN_BIT;
+
if (tspi->is_packed)
command1 |= SPI_PACKED;
else
@@ -1152,7 +1157,8 @@ static int tegra_spi_probe(struct platform_device *pdev)
master->max_speed_hz = 25000000; /* 25MHz */
/* the spi->mode bits understood by this driver: */
- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST |
+ SPI_TX_DUAL | SPI_RX_DUAL;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
master->setup = tegra_spi_setup;
master->transfer_one_message = tegra_spi_transfer_one_message;