Unverified Commit cac7e505 authored by Larisa Grigore's avatar Larisa Grigore Committed by Mark Brown
Browse files

spi: spi-fsl-dspi: Avoid setup_accel logic for DMA transfers 



Repacking multiple smaller words into larger ones to make use of the
full FIFO doesn't save anything in DMA mode, so don't bother doing it.

Signed-off-by: default avatarLarisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: default avatarJames Clark <james.clark@linaro.org>
Link: https://patch.msgid.link/20250522-james-nxp-spi-v2-8-bea884630cfb@linaro.org


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent e7397e4d

drivers/spi/spi-fsl-dspi.c

+7 −6
Original line number Diff line number Diff line
@@ -850,8 +850,12 @@ static void dspi_setup_accel(struct fsl_dspi *dspi) 
	struct spi_transfer *xfer = dspi->cur_transfer;

	bool odd = !!(dspi->len & 1);



	/* No accel for frames not multiple of 8 bits at the moment */

	if (xfer->bits_per_word % 8)

	/*

	 * No accel for DMA transfers or frames not multiples of 8 bits at the

	 * moment.

	 */

	if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE ||

	    xfer->bits_per_word % 8)

		goto no_accel;



	if (!odd && dspi->len <= dspi->devtype_data->fifo_size * 2) {
@@ -860,10 +864,7 @@ static void dspi_setup_accel(struct fsl_dspi *dspi) 
		dspi->oper_bits_per_word = 8;

	} else {

		/* Start off with maximum supported by hardware */

		if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE)

		dspi->oper_bits_per_word = 32;

		else

			dspi->oper_bits_per_word = 16;



		/*

		 * And go down only if the buffer can't be sent with