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

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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>
This commit is contained in:
Larisa Grigore 2025-05-22 15:51:37 +01:00 committed by Mark Brown
parent e7397e4d3b
commit cac7e50541
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GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 6 deletions
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13
drivers/spi/spi-fsl-dspi.c
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@ -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;
dspi->oper_bits_per_word = 32;
/*
* And go down only if the buffer can't be sent with