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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>
This commit is contained in:
Ajay Kumar Gupta 2012-06-21 17:18:12 +05:30 committed by Felipe Balbi
parent d7dbdb5e5f
commit 8c778db9f0
1 changed files with 12 additions and 2 deletions
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14
drivers/usb/musb/musb_host.c
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@ -375,11 +375,21 @@ static void musb_advance_schedule(struct musb *musb, struct urb *urb,
*/ */
if (list_empty(&qh->hep->urb_list)) { if (list_empty(&qh->hep->urb_list)) {
struct list_head *head; struct list_head *head;
struct dma_controller *dma = musb->dma_controller;
if (is_in) if (is_in) {
ep->rx_reinit = 1; ep->rx_reinit = 1;
else if (ep->rx_channel) {
dma->channel_release(ep->rx_channel);
ep->rx_channel = NULL;
}
} else {
ep->tx_reinit = 1; ep->tx_reinit = 1;
if (ep->tx_channel) {
dma->channel_release(ep->tx_channel);
ep->tx_channel = NULL;
}
}
/* Clobber old pointers to this qh */ /* Clobber old pointers to this qh */
musb_ep_set_qh(ep, is_in, NULL); musb_ep_set_qh(ep, is_in, NULL);