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: 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>

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 814a92b8064e77f7e6f071c2f1a644243b33307f..24a51267cb4d9ab3465ca4c15d6a42ec4b1f42a9 100644 (file)
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -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