From: Tomer Maimon <tmaimon77@gmail.com>
To: broonie@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com,
avifishman70@gmail.com, tali.perry1@gmail.com,
venture@google.com, yuenn@google.com, benjaminfair@google.com
Cc: linux-spi@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org,
Tomer Maimon <tmaimon77@gmail.com>
Subject: [PATCH v1 2/4] spi: npcm-pspi: improve spi transfer performance
Date: Wed, 15 Jan 2020 18:22:59 +0200 [thread overview]
Message-ID: <20200115162301.235926-3-tmaimon77@gmail.com> (raw)
In-Reply-To: <20200115162301.235926-1-tmaimon77@gmail.com>
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>
---
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 c74611abe2a9..eac7ba18b4b9 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;
--
2.22.0
next prev parent reply other threads:[~2020-01-15 17:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 16:22 [PATCH v1 0/4] spi: npcm-pspi: improve preformance modify reset and fix issue Tomer Maimon
2020-01-15 16:22 ` [PATCH v1 1/4] spi: npcm-pspi: fix 16 bit send and receive support Tomer Maimon
2020-01-17 15:44 ` Applied "spi: npcm-pspi: fix 16 bit send and receive support" to the spi tree Mark Brown
2020-01-15 16:22 ` Tomer Maimon [this message]
2020-01-17 15:44 ` Applied "spi: npcm-pspi: improve spi transfer performance" " Mark Brown
2020-01-15 16:23 ` [PATCH v1 3/4] dt-binding: spi: add NPCM PSPI reset binding Tomer Maimon
2020-01-21 23:13 ` Rob Herring
2020-01-23 12:36 ` Applied "dt-binding: spi: add NPCM PSPI reset binding" to the spi tree Mark Brown
2020-01-15 16:23 ` [PATCH v1 4/4] spi: npcm-pspi: modify reset support Tomer Maimon
2020-01-17 15:44 ` Applied "spi: npcm-pspi: modify reset support" to the spi tree Mark Brown
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