This patch adds back support for half-duplex controllers, which was removed in the last patch. Reviewed-by: Dan Murphy <dmurphy@xxxxxx> Tested-by: Sean Nyekjaer <sean@xxxxxxxxxx> Link: https://lore.kernel.org/r/20201215231746.1132907-17-mkl@xxxxxxxxxxxxxx Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> --- drivers/net/can/m_can/tcan4x5x-regmap.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/net/can/m_can/tcan4x5x-regmap.c b/drivers/net/can/m_can/tcan4x5x-regmap.c index 660e9d87dffb..ca80dbaf7a3f 100644 --- a/drivers/net/can/m_can/tcan4x5x-regmap.c +++ b/drivers/net/can/m_can/tcan4x5x-regmap.c @@ -51,7 +51,7 @@ static int tcan4x5x_regmap_read(void *context, struct tcan4x5x_priv *priv = spi_get_drvdata(spi); struct tcan4x5x_map_buf *buf_rx = &priv->map_buf_rx; struct tcan4x5x_map_buf *buf_tx = &priv->map_buf_tx; - struct spi_transfer xfer[] = { + struct spi_transfer xfer[2] = { { .tx_buf = buf_tx, } @@ -66,17 +66,26 @@ static int tcan4x5x_regmap_read(void *context, sizeof(buf_tx->cmd.addr)); tcan4x5x_spi_cmd_set_len(&buf_tx->cmd, val_len); - xfer[0].rx_buf = buf_rx; - xfer[0].len = sizeof(buf_tx->cmd) + val_len; + if (spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX) { + xfer[0].len = sizeof(buf_tx->cmd); + + xfer[1].rx_buf = val_buf; + xfer[1].len = val_len; + spi_message_add_tail(&xfer[1], &msg); + } else { + xfer[0].rx_buf = buf_rx; + xfer[0].len = sizeof(buf_tx->cmd) + val_len; - if (TCAN4X5X_SANITIZE_SPI) - memset(buf_tx->data, 0x0, val_len); + if (TCAN4X5X_SANITIZE_SPI) + memset(buf_tx->data, 0x0, val_len); + } err = spi_sync(spi, &msg); if (err) return err; - memcpy(val_buf, buf_rx->data, val_len); + if (!(spi->controller->flags & SPI_CONTROLLER_HALF_DUPLEX)) + memcpy(val_buf, buf_rx->data, val_len); return 0; } -- 2.29.2
