lkml.org 
[lkml]   [2017]   [Sep]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] serial: sh-sci: suppress warning for ports without dma channels
Date
From: Andy Lowe <andy_lowe@mentor.com>

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>
---
drivers/tty/serial/sh-sci.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 945a0b04c37c..ab8a7ea7062f 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1490,6 +1490,14 @@ 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) {
--
2.14.1
\
 
 \ /
  Last update: 2017-09-22 20:36    [W:0.040 / U:0.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site