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>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index ef8d744800ac..e090c799d87b 100644
--- 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);