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From 382a0b0dc4cbd0e0fbfd6c2d132e972c3d1245b0 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Sun, 13 Nov 2011 14:59:37 +0100
Subject: [PATCH 39/84] bcm63xx_enet: fix lockup on BCM6328
BCM6328 locks up on a maxburst size of 16, reduce it to 8 for BCM6328 and
BCM6368.
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
drivers/net/ethernet/broadcom/bcm63xx_enet.c | 13 +++++++------
drivers/net/ethernet/broadcom/bcm63xx_enet.h | 4 ++++
2 files changed, 11 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c
@@ -261,7 +261,6 @@ static int bcm_enet_refill_rx(struct net
if (!skb)
break;
priv->rx_skb[desc_idx] = skb;
-
p = dma_map_single(&priv->pdev->dev, skb->data,
priv->rx_skb_size,
DMA_FROM_DEVICE);
@@ -995,9 +994,9 @@ static int bcm_enet_open(struct net_devi
enet_writel(priv, priv->hw_mtu, ENET_TXMAXLEN_REG);
/* set dma maximum burst len */
- enet_dmac_writel(priv, BCMENET_DMA_MAXBURST,
+ enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST_REG(priv->rx_chan));
- enet_dmac_writel(priv, BCMENET_DMA_MAXBURST,
+ enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST_REG(priv->tx_chan));
/* set correct transmit fifo watermark */
@@ -1593,7 +1592,7 @@ static int compute_hw_mtu(struct bcm_ene
* it's appended
*/
priv->rx_skb_size = ALIGN(actual_mtu + ETH_FCS_LEN,
- BCMENET_DMA_MAXBURST * 4);
+ priv->dma_maxburst * 4);
return 0;
}
@@ -1701,6 +1700,7 @@ static int bcm_enet_probe(struct platfor
priv = netdev_priv(dev);
priv->enet_is_sw = false;
+ priv->dma_maxburst = BCMENET_DMA_MAXBURST;
ret = compute_hw_mtu(priv, dev->mtu);
if (ret)
@@ -2282,9 +2282,9 @@ static int bcm_enetsw_open(struct net_de
enet_dmas_writel(priv, 0, ENETDMAS_SRAM4_REG(priv->tx_chan));
/* set dma maximum burst len */
- enet_dmac_writel(priv, BCMENET_DMA_MAXBURST,
+ enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST_REG(priv->rx_chan));
- enet_dmac_writel(priv, BCMENET_DMA_MAXBURST,
+ enet_dmac_writel(priv, priv->dma_maxburst,
ENETDMAC_MAXBURST_REG(priv->tx_chan));
/* set flow control low/high threshold to 1/3 / 2/3 */
@@ -2749,6 +2749,7 @@ static int bcm_enetsw_probe(struct platf
priv->irq_tx = irq_tx;
priv->rx_ring_size = BCMENET_DEF_RX_DESC;
priv->tx_ring_size = BCMENET_DEF_TX_DESC;
+ priv->dma_maxburst = BCMENETSW_DMA_MAXBURST;
pd = pdev->dev.platform_data;
if (pd) {
--- a/drivers/net/ethernet/broadcom/bcm63xx_enet.h
+++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.h
@@ -18,6 +18,7 @@
/* maximum burst len for dma (4 bytes unit) */
#define BCMENET_DMA_MAXBURST 16
+#define BCMENETSW_DMA_MAXBURST 8
/* tx transmit threshold (4 bytes unit), fifo is 256 bytes, the value
* must be low enough so that a DMA transfer of above burst length can
@@ -252,6 +253,9 @@ struct bcm_enet_priv {
/* number of dma desc in tx ring */
int tx_ring_size;
+ /* maximum dma burst size */
+ int dma_maxburst;
+
/* cpu view of rx dma ring */
struct bcm_enet_desc *tx_desc_cpu;
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