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serial: sh-sci: do not warn if DMA transfers are not supported

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Not all (H)SCIF devices support DMA, and failure to set it up is not
normally a cause for concern. This patch demotes the associated warning to
debug output.

Inspired by BSP patch "sci: sh-sci: Fix transfer sequence of unsupport DMA
transfer" (6beb1f98d3bd30) by Hiromitsu Yamasaki.

Signed-off-by: Ulrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ulrich Hecht 2018-10-12 15:47:49 +02:00 committed by Greg Kroah-Hartman
parent 2088cfd882
commit c58a3ae58b
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/sh-sci.c
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@ -1516,7 +1516,7 @@ static struct dma_chan *sci_request_dma_chan(struct uart_port *port,
chan = dma_request_slave_channel(port->dev,
dir == DMA_MEM_TO_DEV ? "tx" : "rx");
if (!chan) {
dev_warn(port->dev, "dma_request_slave_channel failed\n");
dev_dbg(port->dev, "dma_request_slave_channel failed\n");
return NULL;
}