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serial: sh-sci: suppress warning for ports without dma channels

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If a port has no dma channel defined in the device tree, then
don't attempt to allocate a dma channel for the port.
Also suppress the warning message concerning the failure to allocate
a dma channel.  Continue to emit the warning message if a dma
channel is defined but cannot be allocated.

Signed-off-by: Andy Lowe <andy_lowe@mentor.com>
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Lowe 2017-09-22 20:29:30 +02:00 committed by Greg Kroah-Hartman
parent daf3930cf6
commit 7464779fa8
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/serial/sh-sci.c
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@ -1506,6 +1506,14 @@ static void sci_request_dma(struct uart_port *port)
return;
s->cookie_tx = -EINVAL;
/*
* Don't request a dma channel if no channel was specified
* in the device tree.
*/
if (!of_find_property(port->dev->of_node, "dmas", NULL))
return;
chan = sci_request_dma_chan(port, DMA_MEM_TO_DEV);
dev_dbg(port->dev, "%s: TX: got channel %p\n", __func__, chan);
if (chan) {