From: Robert Baldyga <r.baldyga@samsung.com>
Date: Thu, 5 Dec 2013 14:04:19 +0000 (+0100)
Subject: USB: gadget: s3c-hsotg: add flush TX FIFO when kill all requests
X-Git-Tag: submit/tizen_common/20140630.083047~520
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b2f40b69a16529fda29be7d775a77305f79572d8;p=platform%2Fkernel%2Flinux-3.10.git

USB: gadget: s3c-hsotg: add flush TX FIFO when kill all requests

This patch adds flushing TX FIFO in kill_all_requests() function in
dedicated-fifo mode. It's because when requests are killed (when endpoint is
disabled or in case of device reset/disconnection) in FIFO can stay some
unsent data. In the worst case FIFO can stay full, and then if endpoint will
be back enabled, sending new data will be impossible.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
Change-Id: Ibdb3d3f14f665d096ad944fb3ad79d25ff11625a
---

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 3bab054..6e4aefe 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -2124,6 +2124,9 @@ static void kill_all_requests(struct s3c_hsotg *hsotg,
 		s3c_hsotg_complete_request(hsotg, ep, req,
 					   result);
 	}
+	if (hsotg->dedicated_fifos)
+		if ((readl(hsotg->regs + DTXFSTS(ep->index)) & 0xffff) * 4 < 3072)
+			s3c_hsotg_txfifo_flush(hsotg, ep->index);
 }
 
 #define call_gadget(_hs, _entry) \