diff options
Diffstat (limited to 'drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c')
| -rw-r--r-- | drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c index 9610d262e966..848b8b2ecb5f 100644 --- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c +++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c @@ -220,6 +220,24 @@ int mcp251xfd_ring_init(struct mcp251xfd_priv *priv) mcp251xfd_ring_init_rx(priv, &base, &fifo_nr); mcp251xfd_ring_init_tx(priv, &base, &fifo_nr); + /* mcp251xfd_handle_rxif() will iterate over all RX rings. + * Rings with their corresponding bit set in + * priv->regs_status.rxif are read out. + * + * If the chip is configured for only 1 RX-FIFO, and if there + * is an RX interrupt pending (RXIF in INT register is set), + * it must be the 1st RX-FIFO. + * + * We mark the RXIF of the 1st FIFO as pending here, so that + * we can skip the read of the RXIF register in + * mcp251xfd_read_regs_status() for the 1 RX-FIFO only case. + * + * If we use more than 1 RX-FIFO, this value gets overwritten + * in mcp251xfd_read_regs_status(), so set it unconditionally + * here. + */ + priv->regs_status.rxif = BIT(priv->rx[0]->fifo_nr); + netdev_dbg(priv->ndev, "FIFO setup: TEF: 0x%03x: %2d*%zu bytes = %4zu bytes\n", mcp251xfd_get_tef_obj_addr(0), |