ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/target/linux/octeontx/patches-5.4/0003-can-mcp251x-convert-to-half-duplex-SPI.patch b/target/linux/octeontx/patches-5.4/0003-can-mcp251x-convert-to-half-duplex-SPI.patch
new file mode 100644
index 0000000..f760b2a
--- /dev/null
+++ b/target/linux/octeontx/patches-5.4/0003-can-mcp251x-convert-to-half-duplex-SPI.patch
@@ -0,0 +1,57 @@
+From 097cc81ee5c15913ad330baffff2e3dea09bdad0 Mon Sep 17 00:00:00 2001
+From: Tim Harvey <tharvey@gateworks.com>
+Date: Thu, 30 Aug 2018 15:16:08 -0700
+Subject: [PATCH] can: mcp251x: convert driver to half-duplex SPI
+
+Some SPI host controllers such as the Cavium Thunder TX do not support
+full-duplex SPI. Using half-duplex transfers allows the driver to work
+with those host controllers.
+
+Signed-off-by: Tim Harvey <tharvey@gateworks.com>
+---
+ drivers/net/can/spi/mcp251x.c | 15 ++++++++-------
+ 1 file changed, 8 insertions(+), 7 deletions(-)
+
+--- a/drivers/net/can/spi/mcp251x.c
++++ b/drivers/net/can/spi/mcp251x.c
+@@ -291,23 +291,23 @@ static u8 mcp251x_read_reg(struct spi_de
+ priv->spi_tx_buf[0] = INSTRUCTION_READ;
+ priv->spi_tx_buf[1] = reg;
+
+- mcp251x_spi_trans(spi, 3);
+- val = priv->spi_rx_buf[2];
++ spi_write_then_read(spi, priv->spi_tx_buf, 2, &val, 1);
+
+ return val;
+ }
+
+ static void mcp251x_read_2regs(struct spi_device *spi, u8 reg, u8 *v1, u8 *v2)
+ {
++ u8 val[4] = {0};
+ struct mcp251x_priv *priv = spi_get_drvdata(spi);
+
+ priv->spi_tx_buf[0] = INSTRUCTION_READ;
+ priv->spi_tx_buf[1] = reg;
+
+- mcp251x_spi_trans(spi, 4);
++ spi_write_then_read(spi, priv->spi_tx_buf, 2, val, 2);
+
+- *v1 = priv->spi_rx_buf[2];
+- *v2 = priv->spi_rx_buf[3];
++ *v1 = val[0];
++ *v2 = val[1];
+ }
+
+ static void mcp251x_write_reg(struct spi_device *spi, u8 reg, u8 val)
+@@ -398,8 +398,9 @@ static void mcp251x_hw_rx_frame(struct s
+ buf[i] = mcp251x_read_reg(spi, RXBCTRL(buf_idx) + i);
+ } else {
+ priv->spi_tx_buf[RXBCTRL_OFF] = INSTRUCTION_READ_RXB(buf_idx);
+- mcp251x_spi_trans(spi, SPI_TRANSFER_BUF_LEN);
+- memcpy(buf, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN);
++ spi_write_then_read(spi, priv->spi_tx_buf, 1, priv->spi_rx_buf,
++ SPI_TRANSFER_BUF_LEN);
++ memcpy(buf + 1, priv->spi_rx_buf, SPI_TRANSFER_BUF_LEN - 1);
+ }
+ }
+