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spi: npcm-pspi: improve spi transfer performance
author
Tomer Maimon
<tmaimon77@gmail.com>
Wed, 15 Jan 2020 16:22:59 +0000
(18:22 +0200)
committer
Mark Brown
<broonie@kernel.org>
Fri, 17 Jan 2020 15:38:02 +0000
(15:38 +0000)
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>
drivers/spi/spi-npcm-pspi.c
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diff --git
a/drivers/spi/spi-npcm-pspi.c
b/drivers/spi/spi-npcm-pspi.c
index
fe62473
..
d224aa6
100644
(file)
--- 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;