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46 lines
1.3 KiB
Diff
46 lines
1.3 KiB
Diff
From 6edfb172ff1dd3cfc84c19790c245a4005474bb7 Mon Sep 17 00:00:00 2001
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From: Tim Harvey <tharvey@gateworks.com>
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Date: Tue, 25 Feb 2020 12:01:36 -0800
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Subject: [PATCH 03/12] can: mcp251x: convert to half-duplex SPI
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Some SPI host controllers such as the Cavium Thunder do not support
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full-duplex SPI. Using half-duplex transfers allows the driver to work
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with those host controllers.
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Signed-off-by: Tim Harvey <tharvey@gateworks.com>
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---
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drivers/net/can/spi/mcp251x.c | 10 +++++-----
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1 file changed, 5 insertions(+), 5 deletions(-)
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--- a/drivers/net/can/spi/mcp251x.c
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+++ b/drivers/net/can/spi/mcp251x.c
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@@ -291,23 +291,23 @@ static u8 mcp251x_read_reg(struct spi_de
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priv->spi_tx_buf[0] = INSTRUCTION_READ;
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priv->spi_tx_buf[1] = reg;
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- mcp251x_spi_trans(spi, 3);
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- val = priv->spi_rx_buf[2];
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+ spi_write_then_read(spi, priv->spi_tx_buf, 2, &val, 1);
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return val;
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}
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static void mcp251x_read_2regs(struct spi_device *spi, u8 reg, u8 *v1, u8 *v2)
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{
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+ u8 val[4] = {0};
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struct mcp251x_priv *priv = spi_get_drvdata(spi);
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priv->spi_tx_buf[0] = INSTRUCTION_READ;
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priv->spi_tx_buf[1] = reg;
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- mcp251x_spi_trans(spi, 4);
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+ spi_write_then_read(spi, priv->spi_tx_buf, 2, val, 2);
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- *v1 = priv->spi_rx_buf[2];
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- *v2 = priv->spi_rx_buf[3];
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+ *v1 = val[0];
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+ *v2 = val[1];
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}
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static void mcp251x_write_reg(struct spi_device *spi, u8 reg, u8 val)
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