serial: sh-sci: don't filter on DMA device, use only channel ID

On some sh-mobile systems there are more than one DMA controllers, that
can be used for serial ports. Specifying a DMA device in sh-sci platform
data unnecessarily restricts the driver to only use one DMA controller.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
[Fixed the trivial conflict in include/linux/serial_sci.h]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 8 insertions, 17 deletions

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index a9414facda47..dbd32a1286d3 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1439,12 +1439,8 @@ static bool filter(struct dma_chan *chan, void *slave)
         dev_dbg(chan->device->dev, "%s: slave ID %d\n", __func__,
                 param->slave_id);
 
-        if (param->dma_dev == chan->device->dev) {
-                chan->private = param;
-                return true;
-        } else {
-                return false;
-        }
+        chan->private = param;
+        return true;
 }
 
 static void rx_timer_fn(unsigned long arg)
@@ -1470,10 +1466,10 @@ static void sci_request_dma(struct uart_port *port)
         dma_cap_mask_t mask;
         int nent;
 
-        dev_dbg(port->dev, "%s: port %d DMA %p\n", __func__,
-                port->line, s->cfg->dma_dev);
+        dev_dbg(port->dev, "%s: port %d\n", __func__,
+                port->line);
 
-        if (!s->cfg->dma_dev)
+        if (s->cfg->dma_slave_tx <= 0 || s->cfg->dma_slave_rx <= 0)
                 return;
 
         dma_cap_zero(mask);
@@ -1483,7 +1479,6 @@ static void sci_request_dma(struct uart_port *port)
 
         /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_TX */
         param->slave_id = s->cfg->dma_slave_tx;
-        param->dma_dev = s->cfg->dma_dev;
 
         s->cookie_tx = -EINVAL;
         chan = dma_request_channel(mask, filter, param);
@@ -1512,7 +1507,6 @@ static void sci_request_dma(struct uart_port *port)
 
         /* Slave ID, e.g., SHDMA_SLAVE_SCIF0_RX */
         param->slave_id = s->cfg->dma_slave_rx;
-        param->dma_dev = s->cfg->dma_dev;
 
         chan = dma_request_channel(mask, filter, param);
         dev_dbg(port->dev, "%s: RX: got channel %p\n", __func__, chan);
@@ -1557,9 +1551,6 @@ static void sci_free_dma(struct uart_port *port)
 {
         struct sci_port *s = to_sci_port(port);
 
-        if (!s->cfg->dma_dev)
-                return;
-
         if (s->chan_tx)
                 sci_tx_dma_release(s, false);
         if (s->chan_rx)
@@ -1967,9 +1958,9 @@ static int __devinit sci_init_single(struct platform_device *dev,
         port->serial_in         = sci_serial_in;
         port->serial_out        = sci_serial_out;
 
-        if (p->dma_dev)
-                dev_dbg(port->dev, "DMA device %p, tx %d, rx %d\n",
-                        p->dma_dev, p->dma_slave_tx, p->dma_slave_rx);
+        if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0)
+                dev_dbg(port->dev, "DMA tx %d, rx %d\n",
+                        p->dma_slave_tx, p->dma_slave_rx);
 
         return 0;
 }