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tty: 8250_omap: use dmaengine_prep_slave_sg()

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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>
This commit is contained in:
Jiri Slaby (SUSE) 2024-04-05 08:08:21 +02:00 committed by Greg Kroah-Hartman
parent 8192fabb0d
commit 9054605ab8
1 changed files with 6 additions and 3 deletions
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9
drivers/tty/serial/8250/8250_omap.c
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@ -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;