linux-kernel - [PATCH v3 2/7] USB: gadget: s3c-hsotg: fix s3c_hsotg_write

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Date:	Thu, 19 Sep 2013 11:50:18 +0200
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, Robert Baldyga <r.baldyga@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: [PATCH v3 2/7] USB: gadget: s3c-hsotg: fix s3c_hsotg_write_fifo
 function for dedicated fifo mode

In s3c_hsotg_write_fifo function PTxFEmp/NPTxFEmp interrupts are enabled
only in shared-fifo mode. In dedicated-fifo mode they should not be used
(when enabled then cause interrupt storm).

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 drivers/usb/gadget/s3c-hsotg.c |   16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index c00ce27..4fe2f9e 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -553,9 +553,11 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
 	if (to_write > hs_ep->ep.maxpacket) {
 		to_write = hs_ep->ep.maxpacket;
 
-		s3c_hsotg_en_gsint(hsotg,
-				   periodic ? GINTSTS_PTxFEmp :
-				   GINTSTS_NPTxFEmp);
+		/* it's needed only when we do not use dedicated fifos */
+		if (!hsotg->dedicated_fifos)
+			s3c_hsotg_en_gsint(hsotg,
+					   periodic ? GINTSTS_PTxFEmp :
+					   GINTSTS_NPTxFEmp);
 	}
 
 	/* see if we can write data */
@@ -580,9 +582,11 @@ static int s3c_hsotg_write_fifo(struct s3c_hsotg *hsotg,
 		 * is more room left.
 		 */
 
-		s3c_hsotg_en_gsint(hsotg,
-				   periodic ? GINTSTS_PTxFEmp :
-				   GINTSTS_NPTxFEmp);
+		/* it's needed only when we do not use dedicated fifos */
+		if (!hsotg->dedicated_fifos)
+			s3c_hsotg_en_gsint(hsotg,
+					   periodic ? GINTSTS_PTxFEmp :
+					   GINTSTS_NPTxFEmp);
 	}
 
 	dev_dbg(hsotg->dev, "write %d/%d, can_write %d, done %d\n",
-- 
1.7.9.5

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