linux-kernel - [PATCH 3.2 099/152] usb: gadget: udc: atmel: change setting for DMA

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Message-ID: <lsq.1424137613.932303555@decadent.org.uk>
Date:	Tue, 17 Feb 2015 01:46:53 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Felipe Balbi" <balbi@...com>,
	"Bo Shen" <voice.shen@...el.com>,
	"Nicolas Ferre" <nicolas.ferre@...el.com>
Subject: [PATCH 3.2 099/152] usb: gadget: udc: atmel: change setting for DMA

3.2.67-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Bo Shen <voice.shen@...el.com>

commit f40afdddeb6c54ffd1e2920a5e93e363d6748db6 upstream.

According to the datasheet, when transfer using DMA, the control
setting for IN packet only need END_BUF_EN, END_BUF_IE, CH_EN,
while for OUT packet, need more two bits END_TR_EN and END_TR_IE
to be configured.

Fixes: 914a3f3b3754 (USB: add atmel_usba_udc driver)
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
Signed-off-by: Bo Shen <voice.shen@...el.com>
Signed-off-by: Felipe Balbi <balbi@...com>
[bwh: Backported to 3.2: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/gadget/atmel_usba_udc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/usb/gadget/atmel_usba_udc.c
+++ b/drivers/usb/gadget/atmel_usba_udc.c
@@ -739,10 +739,10 @@ static int queue_dma(struct usba_udc *ud
 
 	req->ctrl = USBA_BF(DMA_BUF_LEN, req->req.length)
 			| USBA_DMA_CH_EN | USBA_DMA_END_BUF_IE
-			| USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
+			| USBA_DMA_END_BUF_EN;
 
-	if (ep->is_in)
-		req->ctrl |= USBA_DMA_END_BUF_EN;
+	if (!ep->is_in)
+		req->ctrl |= USBA_DMA_END_TR_EN | USBA_DMA_END_TR_IE;
 
 	/*
 	 * Add this request to the queue and submit for DMA if

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