diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_dw.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 7ed0580d2794..f4c5bd6fade1 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -247,7 +247,15 @@ out: serial8250_do_set_termios(p, termios, old); } -static bool dw8250_dma_filter(struct dma_chan *chan, void *param) +/* + * dw8250_fallback_dma_filter will prevent the UART from getting just any free + * channel on platforms that have DMA engines, but don't have any channels + * assigned to the UART. + * + * REVISIT: This is a work around for limitation in the DMA Engine API. Once the + * core problem is fixed, this function is no longer needed. + */ +static bool dw8250_fallback_dma_filter(struct dma_chan *chan, void *param) { return false; } @@ -374,6 +382,7 @@ static int dw8250_probe(struct platform_device *pdev) if (!data) return -ENOMEM; + data->dma.fn = dw8250_fallback_dma_filter; data->usr_reg = DW_UART_USR; p->private_data = data; @@ -460,10 +469,6 @@ static int dw8250_probe(struct platform_device *pdev) if (!IS_ERR(data->rst)) reset_control_deassert(data->rst); - data->dma.rx_param = data; - data->dma.tx_param = data; - data->dma.fn = dw8250_dma_filter; - dw8250_quirks(p, data); /* If the Busy Functionality is not implemented, don't handle it */ |