pch_dma: fix dma direction issue for ML7213 IOH video-in

Currently, even-channel number is set as tx direction and odd is set as rx.
However, though video-in uses ch6, the direction is not tx but rx.
This patch sets video-in's DMA direction correctly.
Signed-off-by: NTomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/pch_dma.c

@@ -478,7 +478,6 @@ static int pd_alloc_chan_resources(struct dma_chan *chan)
 	spin_unlock_bh(&pd_chan->lock);
 
 	pdc_enable_irq(chan, 1);
-	pdc_set_dir(chan);
 
 	return pd_chan->descs_allocated;
 }
@@ -561,6 +560,9 @@ static struct dma_async_tx_descriptor *pd_prep_slave_sg(struct dma_chan *chan,
 	else
 		return NULL;
 
+	pd_chan->dir = direction;
+	pdc_set_dir(chan);
+
 	for_each_sg(sgl, sg, sg_len, i) {
 		desc = pdc_desc_get(pd_chan);
 
@@ -850,8 +852,6 @@ static int __devinit pch_dma_probe(struct pci_dev *pdev,
 
 		pd_chan->membase = &regs->desc[i];
 
-		pd_chan->dir = (i % 2) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
-
 		spin_lock_init(&pd_chan->lock);
 
 		INIT_LIST_HEAD(&pd_chan->active_list);