hi Mark,

Thanks for reviewing.

On Fri, May 22, 2020 at 7:36 PM Mark Brown [off-list ref] wrote:

On Mon, May 18, 2020 at 07:09:20PM +0800, dillon.minfei@gmail.com wrote:

quoted

2, use stm32 spi's "In full-duplex (BIDIMODE=0 and RXONLY=0)", as tx_buf is
null, we must add dummy data sent out before read data.
so, add stm32f4_spi_tx_dummy() to handle this situation.

There are flags SPI_CONTROLLER_MUST_TX and SPI_CONTROLLER_MUST_RX flags
that the driver can set if it needs to, no need to open code this in the
driver.

Yes, after check SPI_CONTROLLER_MUST_TX in drivers/spi/spi.c , it's
indeed to meet
this situation,  i will try it and sumbmit a new patch.

thanks.

best regards

Dillon

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