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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: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2013-04-10 16:58:26 +03:00 committed by Greg Kroah-Hartman
parent 75df022b5f
commit e4fb3b88eb
1 changed files with 6 additions and 2 deletions
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8
drivers/tty/serial/8250/8250_dma.c
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@ -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;