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

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[ Upstream commit cac7e50541 ]

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: Larisa Grigore <larisa.grigore@nxp.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Link: https://patch.msgid.link/20250522-james-nxp-spi-v2-8-bea884630cfb@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Larisa Grigore
2026-08-19 18:13:08 +02:00
committed by Greg Kroah-Hartman
parent 1232fd8cc2
commit a74a3bc424
1 changed files with 7 additions and 6 deletions
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drivers/spi/spi-fsl-dspi.c
+7 -6
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@@ -751,8 +751,12 @@ 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) {
@@ -761,10 +765,7 @@ 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;
dspi->oper_bits_per_word = 32;
/*
* And go down only if the buffer can't be sent with