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spi: npcm-pspi: improve spi transfer performance

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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>
This commit is contained in:
Tomer Maimon 2020-01-15 18:22:59 +02:00 committed by Mark Brown
parent 6925212f32
commit b4adf5b27d
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GPG key ID: 24D68B725D5487D0
1 changed files with 7 additions and 0 deletions
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7
drivers/spi/spi-npcm-pspi.c
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@ -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;