usb: musb: host: release dma channels if no active io

Currently DMA channels are allocated and they remain allocated
even if there is no active data transfer. Added channel_release()
whenever there is no pending request.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index ef8d744800ac29c58dc24e089a645211fcd665ff..e090c799d87bcf18c5d869b1762d2b7f5feea9fa 100644 (file)
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -375,11 +375,21 @@ static void musb_advance_schedule(struct musb *musb, struct urb *urb,
         */
        if (list_empty(&qh->hep->urb_list)) {
                struct list_head        *head;
+               struct dma_controller   *dma = musb->dma_controller;
 
-               if (is_in)
+               if (is_in) {
                        ep->rx_reinit = 1;
-               else
+                       if (ep->rx_channel) {
+                               dma->channel_release(ep->rx_channel);
+                               ep->rx_channel = NULL;
+                       }
+               } else {
                        ep->tx_reinit = 1;
+                       if (ep->tx_channel) {
+                               dma->channel_release(ep->tx_channel);
+                               ep->tx_channel = NULL;
+                       }
+               }
 
                /* Clobber old pointers to this qh */
                musb_ep_set_qh(ep, is_in, NULL);