From b4adf5b27d59cdefff1e6fcba99151edea65a9f7 Mon Sep 17 00:00:00 2001 From: Tomer Maimon Date: Wed, 15 Jan 2020 18:22:59 +0200 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20200115162301.235926-3-tmaimon77@gmail.com Signed-off-by: Mark Brown --- drivers/spi/spi-npcm-pspi.c | 7 +++++++ 1 file changed, 7 insertions(+) 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;