diff options
| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2020-03-05 00:00:33 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-03-05 14:06:14 +0000 |
| commit | 53fadb4d90c762b560a9d0983bb5894129057ea1 (patch) | |
| tree | 3183338c66fadff172493d7f8b9c212ae02c4093 /drivers/spi/spi-fsl-dspi.c | |
| parent | cb71d8efd74c588fc68cce2180a4861091e8fe8a (diff) | |
| download | linux-stable-53fadb4d90c762b560a9d0983bb5894129057ea1.tar.gz linux-stable-53fadb4d90c762b560a9d0983bb5894129057ea1.tar.bz2 linux-stable-53fadb4d90c762b560a9d0983bb5894129057ea1.zip | |
spi: spi-fsl-dspi: Simplify bytes_per_word gymnastics
Reduce the if-then-else-if-then-else sequence to:
- a simple division in the case of bytes_per_word calculation
- a memcpy command with a variable size. The semantics of larger-than-8
xfer->bits_per_word is that those words are to be interpreted and
transmitted in CPU native endianness.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20200304220044.11193-2-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-fsl-dspi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-dspi.c | 21 |
1 files changed, 3 insertions, 18 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index c357c3247232..896d7a0f45b0 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -252,12 +252,7 @@ static u32 dspi_pop_tx(struct fsl_dspi *dspi) u32 txdata = 0; if (dspi->tx) { - if (dspi->bytes_per_word == 1) - txdata = *(u8 *)dspi->tx; - else if (dspi->bytes_per_word == 2) - txdata = *(u16 *)dspi->tx; - else /* dspi->bytes_per_word == 4 */ - txdata = *(u32 *)dspi->tx; + memcpy(&txdata, dspi->tx, dspi->bytes_per_word); dspi->tx += dspi->bytes_per_word; } dspi->len -= dspi->bytes_per_word; @@ -284,12 +279,7 @@ static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata) /* Mask off undefined bits */ rxdata &= (1 << dspi->bits_per_word) - 1; - if (dspi->bytes_per_word == 1) - *(u8 *)dspi->rx = rxdata; - else if (dspi->bytes_per_word == 2) - *(u16 *)dspi->rx = rxdata; - else /* dspi->bytes_per_word == 4 */ - *(u32 *)dspi->rx = rxdata; + memcpy(dspi->rx, &rxdata, dspi->bytes_per_word); dspi->rx += dspi->bytes_per_word; } @@ -814,12 +804,7 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr, dspi->progress = 0; /* Validated transfer specific frame size (defaults applied) */ dspi->bits_per_word = transfer->bits_per_word; - if (transfer->bits_per_word <= 8) - dspi->bytes_per_word = 1; - else if (transfer->bits_per_word <= 16) - dspi->bytes_per_word = 2; - else - dspi->bytes_per_word = 4; + dspi->bytes_per_word = DIV_ROUND_UP(dspi->bits_per_word, 8); regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF, |