netdev - [PATCH] net: stmmac: fixed the pbl setting with DT

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Date:	Sat, 24 Aug 2013 15:31:43 +0900
From:	Byungho An <bh74.an@...sung.com>
To:	netdev@...r.kernel.org
Cc:	'Giuseppe CAVALLARO' <peppe.cavallaro@...com>, davem@...emloft.net,
	'김국진' <kgene.kim@...sung.com>
Subject: [PATCH] net: stmmac: fixed the pbl setting with DT


This patch fixed the pbl(programmable burst length) setting 
using DT. Even though the default pbl is 8, If there is no 
pbl property in device tree file, pbl is set 0 and it causes 
bandwidth degradation.

Signed-off-by: Byungho An <bh74.an@...sung.com>
---
 .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 98e1988..142ee8e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -78,14 +78,18 @@ static int stmmac_probe_config_dt(struct platform_device *pdev,
 		plat->force_sf_dma_mode = 1;
 	}
 
-	dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg), GFP_KERNEL);
-	if (!dma_cfg)
-		return -ENOMEM;
-
-	plat->dma_cfg = dma_cfg;
-	of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
-	dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst");
-	dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst");
+	if (of_find_property(np, "snps,pbl", NULL)) {
+		dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
+				       GFP_KERNEL);
+		if (!dma_cfg)
+			return -ENOMEM;
+		plat->dma_cfg = dma_cfg;
+		of_property_read_u32(np, "snps,pbl", &dma_cfg->pbl);
+		dma_cfg->fixed_burst =
+			of_property_read_bool(np, "snps,fixed-burst");
+		dma_cfg->mixed_burst =
+			of_property_read_bool(np, "snps,mixed-burst");
+	}
 
 	return 0;
 }
-- 
1.7.10.4


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