diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_dma.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dma.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c index cf7a2e3288a6..7a26c4d13b18 100644 --- a/drivers/tty/serial/8250/8250_dma.c +++ b/drivers/tty/serial/8250/8250_dma.c @@ -201,6 +201,15 @@ int serial8250_request_dma(struct uart_8250_port *p) goto release_rx; } + /* 8250 tx dma requires dmaengine driver to support terminate */ + ret = dma_get_slave_caps(dma->txchan, &caps); + if (ret) + goto err; + if (!caps.cmd_terminate) { + ret = -EINVAL; + goto err; + } + dmaengine_slave_config(dma->txchan, &dma->txconf); /* RX buffer */ |