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Message-Id: <20230628125406.237949-1-stefan.moring@technolution.nl>
Date: Wed, 28 Jun 2023 14:54:06 +0200
From: Stefan Moring <stefan.moring@...hnolution.nl>
To: broonie@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
festevam@...il.com, linux-imx@....com, linux-spi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc: Stefan Moring <stefan.moring@...hnolution.nl>
Subject: [PATCH] spi: Increase imx51 ecspi burst length based on transfer length
IMX51 supports 4096 bit burst lengths. Using the spi transfer length
instead of bits_per_word increases performance significantly.
Signed-off-by: Stefan Moring <stefan.moring@...hnolution.nl>
---
drivers/spi/spi-imx.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 34e5f81ec431..cbd306c25d28 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -644,9 +644,13 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx,
if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))
ctrl |= (spi_imx->slave_burst * 8 - 1)
<< MX51_ECSPI_CTRL_BL_OFFSET;
- else
- ctrl |= (spi_imx->bits_per_word - 1)
- << MX51_ECSPI_CTRL_BL_OFFSET;
+ else {
+ if (spi_imx->count >= 512)
+ ctrl |= 0xFFF << MX51_ECSPI_CTRL_BL_OFFSET;
+ else
+ ctrl |= (spi_imx->count*8 - 1)
+ << MX51_ECSPI_CTRL_BL_OFFSET;
+ }
/* set clock speed */
ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
@@ -1243,6 +1247,7 @@ static int spi_imx_setupxfer(struct spi_device *spi,
spi_imx->spi_bus_clk = t->speed_hz;
spi_imx->bits_per_word = t->bits_per_word;
+ spi_imx->count = t->len;
/*
* Initialize the functions for transfer. To transfer non byte-aligned
--
2.34.1
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