linux-kernel - [PATCH 2/2] USB: gadget: s3c-hsotg: add flush TX FIFO when kill all requests

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Date:	Fri, 06 Dec 2013 13:03:45 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com,
	m.szyprowski@...sung.com, andrzej.p@...sung.com,
	Robert Baldyga <r.baldyga@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH 2/2] 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@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>

---
 drivers/usb/gadget/s3c-hsotg.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index ad9a4ed..4a085e6 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -2156,6 +2156,9 @@ 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) \
-- 
1.7.9.5

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