From: Michael Heimpold Date: Thu, 28 Apr 2016 20:06:14 +0000 (+0200) Subject: net: ethernet: enc28j60: support half-duplex SPI controllers X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2957a28a0e874aea0f734e2897b27f669502a970;p=linux-beck.git net: ethernet: enc28j60: support half-duplex SPI controllers 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/microchip/enc28j60.c b/drivers/net/ethernet/microchip/enc28j60.c index 86ea17e7ba7b..b723622fe94a 100644 --- a/drivers/net/ethernet/microchip/enc28j60.c +++ b/drivers/net/ethernet/microchip/enc28j60.c @@ -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))