From b3654ce17ef4ffaf1e96b91cc060ac4019911f5a Mon Sep 17 00:00:00 2001
From: Feng Tang <feng.tang@intel.com>
Date: Tue, 22 Feb 2011 15:28:12 +0800
Subject: [PATCH] --- yaml --- r: 235548 b: refs/heads/master c:
 f023eab379821365bf265a0240f30c00cecaef7c h: refs/heads/master v: v3

---
 [refs]                         |  2 +-
 trunk/drivers/tty/serial/mfd.c | 11 +++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 551062d2f834..afc5ca023ca4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 085a4f758f0cf95e1865b63892bf4304a149f0ca
+refs/heads/master: f023eab379821365bf265a0240f30c00cecaef7c
diff --git a/trunk/drivers/tty/serial/mfd.c b/trunk/drivers/tty/serial/mfd.c
index 53ff6af16273..c111f36f5d21 100644
--- a/trunk/drivers/tty/serial/mfd.c
+++ b/trunk/drivers/tty/serial/mfd.c
@@ -47,6 +47,11 @@
 #define mfd_readl(obj, offset)		readl(obj->reg + offset)
 #define mfd_writel(obj, offset, val)	writel(val, obj->reg + offset)
 
+static int hsu_dma_enable;
+module_param(hsu_dma_enable, int, 0);
+MODULE_PARM_DESC(hsu_dma_enable, "It is a bitmap to set working mode, if \
+bit[x] is 1, then port[x] will work in DMA mode, otherwise in PIO mode.");
+
 struct hsu_dma_buffer {
 	u8		*buf;
 	dma_addr_t	dma_addr;
@@ -1367,6 +1372,12 @@ static void hsu_global_init(void)
 
 		serial_hsu_ports[i] = uport;
 		uport->index = i;
+
+		if (hsu_dma_enable & (1<<i))
+			uport->use_dma = 1;
+		else
+			uport->use_dma = 0;
+
 		uport++;
 	}