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serial: 8250_dw: provide a filter for DMA channel detection

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The channel IDs are set to -1 by default. It will prevent
dmaengine from trying to provide the first free channel if
it fails to allocate exclusive channel. This will fix an
issue with ACPI enumerated UARTs that do not support DMA
but still end up getting a DMA channel incorrectly.

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
2013-09-05 17:34:54 +03:00
committed by Greg Kroah-Hartman
parent fe95855539
commit 7fb8c56c7f
1 changed files with 14 additions and 0 deletions
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drivers/tty/serial/8250/8250_dw.c
+14
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@@ -154,6 +154,14 @@ dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old)
pm_runtime_put_sync_suspend(port->dev);
}
static bool dw8250_dma_filter(struct dma_chan *chan, void *param)
{
struct dw8250_data *data = param;
return chan->chan_id == data->dma.tx_chan_id ||
chan->chan_id == data->dma.rx_chan_id;
}
static void dw8250_setup_port(struct uart_8250_port *up)
{
struct uart_port *p = &up->port;
@@ -314,6 +322,12 @@ static int dw8250_probe(struct platform_device *pdev)
uart.port.uartclk = clk_get_rate(data->clk);
}
data->dma.rx_chan_id = -1;
data->dma.tx_chan_id = -1;
data->dma.rx_param = data;
data->dma.tx_param = data;
data->dma.fn = dw8250_dma_filter;
uart.port.iotype = UPIO_MEM;
uart.port.serial_in = dw8250_serial_in;
uart.port.serial_out = dw8250_serial_out;