1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c
index 53ff6af16273..c111f36f5d21 100644
--- a/drivers/tty/serial/mfd.c
+++ b/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++;
         }