From: Troy Kisky <troy.kisky@boundarydevices.com>
Date: Fri, 20 Oct 2017 21:20:19 +0000 (-0700)
Subject: tty: serial: imx: disable ageing timer interrupt if dma in use
X-Git-Tag: v4.15-rc1~141^2~17
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=52108109fa125ffb11df178e1ac5eb9650f0743d;p=linux.git

tty: serial: imx: disable ageing timer interrupt if dma in use

Since commit 4dec2f119e86 ("imx-serial: RX DMA startup latency")
the interrupt routine no longer will start rx dma.
So, we no longer need to enable this interrupt to start dma.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 2d042c60d2fa..bf3e981e26a2 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1208,10 +1208,6 @@ static void imx_enable_dma(struct imx_port *sport)
 	temp |= UCR1_RDMAEN | UCR1_TDMAEN | UCR1_ATDMAEN;
 	writel(temp, sport->port.membase + UCR1);
 
-	temp = readl(sport->port.membase + UCR2);
-	temp |= UCR2_ATEN;
-	writel(temp, sport->port.membase + UCR2);
-
 	imx_setup_ufcr(sport, TXTL_DMA, RXTL_DMA);
 
 	sport->dma_is_enabled = 1;