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| author | Jiri Slaby (SUSE) <jirislaby@kernel.org> | 2024-04-05 08:08:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-04-09 15:28:03 +0200 |
| commit | 9054605ab8468936a514298211d9e9bb68bf24bd (patch) | |
| tree | 639e5950126142343622548e054c0d20355c65cb | |
| parent | 8192fabb0db269a4130d8cbdd8557a47bfa1ffec (diff) | |
| download | linux-9054605ab8468936a514298211d9e9bb68bf24bd.tar.gz linux-9054605ab8468936a514298211d9e9bb68bf24bd.tar.bz2 linux-9054605ab8468936a514298211d9e9bb68bf24bd.zip | |
tty: 8250_omap: use dmaengine_prep_slave_sg()
This is a preparatory for the serial-to-kfifo switch. kfifo understands
only scatter-gatter approach, so switch to that.
No functional change intended, it's just dmaengine_prep_slave_single()
inline expanded.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240405060826.2521-11-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_omap.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 66901d93089a..879e77b30701 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -1140,6 +1140,7 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) struct omap8250_priv *priv = p->port.private_data; struct circ_buf *xmit = &p->port.state->xmit; struct dma_async_tx_descriptor *desc; + struct scatterlist sg; unsigned int skip_byte = 0; int ret; @@ -1191,9 +1192,11 @@ static int omap_8250_tx_dma(struct uart_8250_port *p) skip_byte = 1; } - desc = dmaengine_prep_slave_single(dma->txchan, - dma->tx_addr + xmit->tail + skip_byte, - dma->tx_size - skip_byte, DMA_MEM_TO_DEV, + sg_init_table(&sg, 1); + sg_dma_address(&sg) = dma->tx_addr + xmit->tail + skip_byte; + sg_dma_len(&sg) = dma->tx_size - skip_byte; + + desc = dmaengine_prep_slave_sg(dma->txchan, &sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc) { ret = -EBUSY; |