usb: gadget: s3c-hsotg: fix endpoint interrupts handling

When s3c_hsotg_trytx is called for ep without enqueued request, interrupts
for this ep are disabled, to prevent interrupt flooding. Interrupts are
enabled when new request for this ep is starting.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index bb173852ae4c460a3abfc66188914a784834e25d..30cead183d50ccbe9fe6022258fa9e369d4eacab 100644 (file)
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -841,6 +841,9 @@ static void s3c_hsotg_start_req(struct s3c_hsotg *hsotg,
 
        dev_dbg(hsotg->dev, "%s: DxEPCTL=0x%08x\n",
                __func__, readl(hsotg->regs + epctrl_reg));
+
+       /* enable ep interrupts */
+       s3c_hsotg_ctrl_epint(hsotg, hs_ep->index, hs_ep->dir_in, 1);
 }
 
 /**
@@ -1814,8 +1817,16 @@ static int s3c_hsotg_trytx(struct s3c_hsotg *hsotg,
 {
        struct s3c_hsotg_req *hs_req = hs_ep->req;
 
-       if (!hs_ep->dir_in || !hs_req)
+       if (!hs_ep->dir_in || !hs_req) {
+               /**
+                * if request is not enqueued, we disable interrupts
+                * for endpoints, excepting ep0
+                */
+               if (hs_ep->index != 0)
+                       s3c_hsotg_ctrl_epint(hsotg, hs_ep->index,
+                                            hs_ep->dir_in, 0);
                return 0;
+       }
 
        if (hs_req->req.actual < hs_req->req.length) {
                dev_dbg(hsotg->dev, "trying to write more for ep%d\n",