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Commit c58a3ae5 authored by Ulrich Hecht's avatar Ulrich Hecht Committed by Greg Kroah-Hartman
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serial: sh-sci: do not warn if DMA transfers are not supported 



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: default avatarUlrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2088cfd8

drivers/tty/serial/sh-sci.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

	}