usb: musb: host: unmap the buffer for PIO data transfers

The USB stack maps the buffer for DMA if the controller supports DMA.
MUSB controller can perform DMA as well as PIO transfers.
The buffer needs to be unmapped before CPU can perform
PIO data transfers.

Export unmap_urb_for_dma() so that drivers can perform
the DMA unmapping in a sane way.

Signed-off-by: Maulik Mankad <x0082077@ti.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 9e65c47cc98b..62e39fc57211 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -41,6 +41,7 @@
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/list.h>
+#include <linux/dma-mapping.h>
 
 #include "musb_core.h"
 #include "musb_host.h"
@@ -1332,6 +1333,8 @@ void musb_host_tx(struct musb *musb, u8 epnum)
          */
         if (length > qh->maxpacket)
                 length = qh->maxpacket;
+        /* Unmap the buffer so that CPU can use it */
+        unmap_urb_for_dma(musb_to_hcd(musb), urb);
         musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset);
         qh->segsize = length;
 
@@ -1752,6 +1755,8 @@ void musb_host_rx(struct musb *musb, u8 epnum)
 #endif  /* Mentor DMA */
 
                 if (!dma) {
+                        /* Unmap the buffer so that CPU can use it */
+                        unmap_urb_for_dma(musb_to_hcd(musb), urb);
                         done = musb_host_packet_rx(musb, urb,
                                         epnum, iso_err);
                         DBG(6, "read %spacket\n", done ? "last " : "");