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net: ethernet: enc28j60: support half-duplex SPI controllers

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The current spi_read_buf function fails on SPI host masters which
are only half-duplex capable. Splitting the Tx and Rx part solves
this issue.

Tested on Raspberry Pi (full duplex) and I2SE Duckbill (half duplex).

Signed-off-by: Michael Heimpold <mhei@heimpold.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Heimpold 2016-04-28 22:06:14 +02:00 committed by David S. Miller
parent f4b05d27ec
commit 2957a28a0e
1 changed files with 9 additions and 5 deletions
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14
drivers/net/ethernet/microchip/enc28j60.c
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@ -89,22 +89,26 @@ spi_read_buf(struct enc28j60_net *priv, int len, u8 *data)
{
u8 *rx_buf = priv->spi_transfer_buf + 4;
u8 *tx_buf = priv->spi_transfer_buf;
struct spi_transfer t = {
struct spi_transfer tx = {
.tx_buf = tx_buf,
.len = SPI_OPLEN,
};
struct spi_transfer rx = {
.rx_buf = rx_buf,
.len = SPI_OPLEN + len,
.len = len,
};
struct spi_message msg;
int ret;
tx_buf[0] = ENC28J60_READ_BUF_MEM;
tx_buf[1] = tx_buf[2] = tx_buf[3] = 0; /* don't care */
spi_message_init(&msg);
spi_message_add_tail(&t, &msg);
spi_message_add_tail(&tx, &msg);
spi_message_add_tail(&rx, &msg);
ret = spi_sync(priv->spi, &msg);
if (ret == 0) {
memcpy(data, &rx_buf[SPI_OPLEN], len);
memcpy(data, rx_buf, len);
ret = msg.status;
}
if (ret && netif_msg_drv(priv))