Commit 9054605a authored by Jiri Slaby (SUSE)'s avatar Jiri Slaby (SUSE) Committed by Greg Kroah-Hartman
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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: default avatarJiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20240405060826.2521-11-jirislaby@kernel.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8192fabb

drivers/tty/serial/8250/8250_omap.c

+6 −3
Original line number Diff line number Diff line
@@ -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;