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Commit e4fb3b88 authored by Heikki Krogerus's avatar Heikki Krogerus Committed by Greg Kroah-Hartman
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serial: 8250_dma: Use dmaengine helpers to get the slave channels 



The helper functions in dmaengine API allow the drivers to
request slave channels without the filter parameters. They
will attempt to extract the needed DMA client information
from DT or ACPI, but if such information is not available
the filter parameters can still be used.

Signed-off-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 75df022b

drivers/tty/serial/8250/8250_dma.c

+6 −2
Original line number Diff line number Diff line
@@ -156,14 +156,18 @@ int serial8250_request_dma(struct uart_8250_port *p) 
	dma_cap_set(DMA_SLAVE, mask);



	/* Get a channel for RX */

	dma->rxchan = dma_request_channel(mask, dma->fn, dma->rx_param);

	dma->rxchan = dma_request_slave_channel_compat(mask,

						       dma->fn, dma->rx_param,

						       p->port.dev, "rx");

	if (!dma->rxchan)

		return -ENODEV;



	dmaengine_slave_config(dma->rxchan, &dma->rxconf);



	/* Get a channel for TX */

	dma->txchan = dma_request_channel(mask, dma->fn, dma->tx_param);

	dma->txchan = dma_request_slave_channel_compat(mask,

						       dma->fn, dma->tx_param,

						       p->port.dev, "tx");

	if (!dma->txchan) {

		dma_release_channel(dma->rxchan);

		return -ENODEV;