[OpenWrt-Devel] [PATCH] arc770/axs101: accomodate DW GMAC long reset sequence

[Alexey Brodkin]

On ARC SDP board DMA block of DW GMAC gets out of reset much
longer than expected by default driver.

For now to accomodate this issue we're extending timeout value.

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
---
 .../0003-fix-GMAC-init-by-longer-reset-wait.patch  | 45 ++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 target/linux/arc770/patches-4.3/0003-fix-GMAC-init-by-longer-reset-wait.patch

diff --git a/target/linux/arc770/patches-4.3/0003-fix-GMAC-init-by-longer-reset-wait.patch b/target/linux/arc770/patches-4.3/0003-fix-GMAC-init-by-longer-reset-wait.patch
new file mode 100644
index 0000000..8bab11d
--- /dev/null
+++ b/target/linux/arc770/patches-4.3/0003-fix-GMAC-init-by-longer-reset-wait.patch
@@ -0,0 +1,45 @@
+From ed78bec3722022f6622f1810111f43e5e752baf6 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin at synopsys.com>
+Date: Mon, 16 Nov 2015 23:15:54 +0300
+Subject: [PATCH] fix GMAC init by longer reset wait
+
+On ARC SDP board DMA block of DW GMAC gets out of reset much
+longer than expected by default driver.
+
+For now to accomodate this issue we're extending timeout value.
+
+Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
+---
+ drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 2 +-
+ drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c  | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+index 0e8937c..f29cf5b 100644
+--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
++++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+@@ -39,7 +39,7 @@ static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb,
+ 	/* DMA SW reset */
+ 	value |= DMA_BUS_MODE_SFT_RESET;
+ 	writel(value, ioaddr + DMA_BUS_MODE);
+-	limit = 10;
++	limit = 1000;
+ 	while (limit--) {
+ 		if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
+ 			break;
+diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
+index 9d0971c..651d94c 100644
+--- a/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
++++ b/drivers/net/ethernet/stmicro/stmmac/dwmac100_dma.c
+@@ -41,7 +41,7 @@ static int dwmac100_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb,
+ 	/* DMA SW reset */
+ 	value |= DMA_BUS_MODE_SFT_RESET;
+ 	writel(value, ioaddr + DMA_BUS_MODE);
+-	limit = 10;
++	limit = 1000;
+ 	while (limit--) {
+ 		if (!(readl(ioaddr + DMA_BUS_MODE) & DMA_BUS_MODE_SFT_RESET))
+ 			break;
+-- 
+2.5.0
+
-- 
2.5.0
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