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| author | dillon min <dillon.minfei@gmail.com> | 2020-05-25 05:45:48 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-05-25 16:56:17 +0200 |
| commit | aee67fe879e5030a2f5e1d9af3cb5b2a1027e78a (patch) | |
| tree | ca043d6a4474144197c78657eea5f42e8f08f227 /drivers/spi/spi.c | |
| parent | spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE_RX' support for stm32f4 (diff) | |
| download | linux-aee67fe879e5030a2f5e1d9af3cb5b2a1027e78a.tar.xz linux-aee67fe879e5030a2f5e1d9af3cb5b2a1027e78a.zip | |
spi: flags 'SPI_CONTROLLER_MUST_RX' and 'SPI_CONTROLLER_MUST_TX' can't be coexit with 'SPI_3WIRE' mode
since chip spi driver need get the transfer direction by 'tx_buf' and
'rx_buf' of 'struct spi_transfer' in 'SPI_3WIRE' mode.
so, we need bypass 'SPI_CONTROLLER_MUST_RX' and 'SPI_CONTROLLER_MUST_TX'
feature in 'SPI_3WIRE' mode
Signed-off-by: dillon min <dillon.minfei@gmail.com>
Link: https://lore.kernel.org/r/1590378348-8115-9-git-send-email-dillon.minfei@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index c765c966cc8e..9d0b3c292e1e 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1023,7 +1023,8 @@ static int spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg) void *tmp; unsigned int max_tx, max_rx; - if (ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) { + if ((ctlr->flags & (SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX)) + && !(msg->spi->mode & SPI_3WIRE)) { max_tx = 0; max_rx = 0; |