netdev - [PATCH 1/6] net: calxedaxgmac: enable operate on 2nd frame mode

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Date:	Fri, 12 Oct 2012 10:15:03 -0500
From:	Rob Herring <robherring2@...il.com>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:	jonathan@...masters.org, eric.dumazet@...il.com,
	Mark Langsdorf <mark.langsdorf@...xeda.com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: [PATCH 1/6] net: calxedaxgmac: enable operate on 2nd frame mode

From: Rob Herring <rob.herring@...xeda.com>

Enable the tx dma to start reading the next frame while sending the current
frame.

Signed-off-by: Rob Herring <rob.herring@...xeda.com>
---
 drivers/net/ethernet/calxeda/xgmac.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 16814b3..7f5fd17 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -191,6 +191,7 @@
 #define DMA_CONTROL_ST		0x00002000	/* Start/Stop Transmission */
 #define DMA_CONTROL_SR		0x00000002	/* Start/Stop Receive */
 #define DMA_CONTROL_DFF		0x01000000	/* Disable flush of rx frames */
+#define DMA_CONTROL_OSF		0x00000004	/* Operate on 2nd tx frame */
 
 /* DMA Normal interrupt */
 #define DMA_INTR_ENA_NIE	0x00010000	/* Normal Summary */
@@ -965,8 +966,7 @@ static int xgmac_hw_init(struct net_device *dev)
 		ctrl |= XGMAC_CONTROL_IPC;
 	writel(ctrl, ioaddr + XGMAC_CONTROL);
 
-	value = DMA_CONTROL_DFF;
-	writel(value, ioaddr + XGMAC_DMA_CONTROL);
+	writel(DMA_CONTROL_DFF | DMA_CONTROL_OSF, ioaddr + XGMAC_DMA_CONTROL);
 
 	/* Set the HW DMA mode and the COE */
 	writel(XGMAC_OMR_TSF | XGMAC_OMR_RFD | XGMAC_OMR_RFA |
-- 
1.7.9.5

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