Applied "spi: npcm-pspi: improve spi transfer performance" to the spi tree

Mark Brown broonie at
Sat Jan 18 02:44:24 AEDT 2020

The patch

   spi: npcm-pspi: improve spi transfer performance

has been applied to the spi tree at for-5.6

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

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>From b4adf5b27d59cdefff1e6fcba99151edea65a9f7 Mon Sep 17 00:00:00 2001
From: Tomer Maimon <tmaimon77 at>
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 <tmaimon77 at>
Signed-off-by: Mark Brown <broonie at>
 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;

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