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| author | Tomer Maimon <tmaimon77@gmail.com> | 2020-01-15 18:22:59 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2020-01-17 15:38:02 +0000 |
| commit | b4adf5b27d59cdefff1e6fcba99151edea65a9f7 (patch) | |
| tree | ef5a1a5cc845ab196e2edd48a89564f52366b106 /drivers/spi/spi-npcm-pspi.c | |
| parent | 6925212f328bf2abde0c8f0d037fddd36751d489 (diff) | |
| download | lwn-b4adf5b27d59cdefff1e6fcba99151edea65a9f7.tar.gz lwn-b4adf5b27d59cdefff1e6fcba99151edea65a9f7.zip | |
spi: npcm-pspi: improve spi transfer performance
Improving spi 8 bit per word mode transfer performance
by using 16 bit per word transfer and receive when the data
length is even and larger than one.
Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Link: https://lore.kernel.org/r/20200115162301.235926-3-tmaimon77@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-npcm-pspi.c')
| -rw-r--r-- | drivers/spi/spi-npcm-pspi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi-npcm-pspi.c b/drivers/spi/spi-npcm-pspi.c index fe624731c74c..d224aa63dbce 100644 --- a/drivers/spi/spi-npcm-pspi.c +++ b/drivers/spi/spi-npcm-pspi.c @@ -178,6 +178,13 @@ static void npcm_pspi_setup_transfer(struct spi_device *spi, priv->mode = spi->mode; } + /* + * If transfer is even length, and 8 bits per word transfer, + * then implement 16 bits-per-word transfer. + */ + if (priv->bits_per_word == 8 && !(t->len & 0x1)) + t->bits_per_word = 16; + if (!priv->is_save_param || priv->bits_per_word != t->bits_per_word) { npcm_pspi_set_transfer_size(priv, t->bits_per_word); priv->bits_per_word = t->bits_per_word; |