dmaengine: omap-dma: Fix the port_window support

We do not yet have users of port_window. The following errors were found
when converting the tusb6010_omap.c musb driver:

- The peripheral side must have SRC_/DST_PACKED disabled
- when configuring the burst for the peripheral side the memory side
  configuration were overwritten: d->csdp = ... -> d->csdp |= ...
- The EI and FI were configured for the wrong sides of the transfers.

With these changes and the converted tus6010_omap.c I was able to verify
that things are working as they expected to work.

Fixes: 201ac486 ("dmaengine: omap-dma: Support for slave devices with data port window")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

drivers/dma/omap-dma.c

@@ -938,21 +938,14 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 		d->ccr |= CCR_DST_AMODE_POSTINC;
 		if (port_window) {
 			d->ccr |= CCR_SRC_AMODE_DBLIDX;
-			d->ei = 1;
-			/*
-			 * One frame covers the port_window and by  configure
-			 * the source frame index to be -1 * (port_window - 1)
-			 * we instruct the sDMA that after a frame is processed
-			 * it should move back to the start of the window.
-			 */
-			d->fi = -(port_window_bytes - 1);
 
 			if (port_window_bytes >= 64)
-				d->csdp = CSDP_SRC_BURST_64 | CSDP_SRC_PACKED;
+				d->csdp |= CSDP_SRC_BURST_64;
 			else if (port_window_bytes >= 32)
-				d->csdp = CSDP_SRC_BURST_32 | CSDP_SRC_PACKED;
+				d->csdp |= CSDP_SRC_BURST_32;
 			else if (port_window_bytes >= 16)
-				d->csdp = CSDP_SRC_BURST_16 | CSDP_SRC_PACKED;
+				d->csdp |= CSDP_SRC_BURST_16;
+
 		} else {
 			d->ccr |= CCR_SRC_AMODE_CONSTANT;
 		}
@@ -962,13 +955,21 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 		d->ccr |= CCR_SRC_AMODE_POSTINC;
 		if (port_window) {
 			d->ccr |= CCR_DST_AMODE_DBLIDX;
+			d->ei = 1;
+			/*
+			 * One frame covers the port_window and by  configure
+			 * the source frame index to be -1 * (port_window - 1)
+			 * we instruct the sDMA that after a frame is processed
+			 * it should move back to the start of the window.
+			 */
+			d->fi = -(port_window_bytes - 1);
 
 			if (port_window_bytes >= 64)
-				d->csdp = CSDP_DST_BURST_64 | CSDP_DST_PACKED;
+				d->csdp |= CSDP_DST_BURST_64;
 			else if (port_window_bytes >= 32)
-				d->csdp = CSDP_DST_BURST_32 | CSDP_DST_PACKED;
+				d->csdp |= CSDP_DST_BURST_32;
 			else if (port_window_bytes >= 16)
-				d->csdp = CSDP_DST_BURST_16 | CSDP_DST_PACKED;
+				d->csdp |= CSDP_DST_BURST_16;
 		} else {
 			d->ccr |= CCR_DST_AMODE_CONSTANT;
 		}
@@ -1017,7 +1018,7 @@ static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg(
 		osg->addr = sg_dma_address(sgent);
 		osg->en = en;
 		osg->fn = sg_dma_len(sgent) / frame_bytes;
-		if (port_window && dir == DMA_MEM_TO_DEV) {
+		if (port_window && dir == DMA_DEV_TO_MEM) {
 			osg->ei = 1;
 			/*
 			 * One frame covers the port_window and by  configure