netdev - [PATCH V2] net: stmmac: dwmac-loongson: Add fix_soc

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Message-Id: <20250212023622.14512-1-zhaoqunqin@loongson.cn>
Date: Wed, 12 Feb 2025 10:36:22 +0800
From: Qunqin Zhao <zhaoqunqin@...ngson.cn>
To: kuba@...nel.org,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com
Cc: chenhuacai@...nel.org,
	si.yanteng@...ux.dev,
	fancer.lancer@...il.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	stable@...r.kernel.org,
	Qunqin Zhao <zhaoqunqin@...ngson.cn>,
	Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH V2] net: stmmac: dwmac-loongson: Add fix_soc_reset() callback

Loongson's DWMAC device may take nearly two seconds to complete DMA reset,
however, the default waiting time for reset is 200 milliseconds.

Fixes: 803fc61df261 ("net: stmmac: dwmac-loongson: Add Loongson Multi-channels GMAC support")
Signed-off-by: Qunqin Zhao <zhaoqunqin@...ngson.cn>
Reviewed-by: Huacai Chen <chenhuacai@...ngson.cn>
---
v2: Added comments. Changed callback name to loongson_dwmac_fix_reset.

 .../net/ethernet/stmicro/stmmac/dwmac-loongson.c   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
index bfe6e2d631bd..f5acfb7d4ff6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-loongson.c
@@ -516,6 +516,19 @@ static int loongson_dwmac_acpi_config(struct pci_dev *pdev,
 	return 0;
 }
 
+/* Loongson's DWMAC device may take nearly two seconds to complete DMA reset */
+static int loongson_dwmac_fix_reset(void *priv, void __iomem *ioaddr)
+{
+	u32 value = readl(ioaddr + DMA_BUS_MODE);
+
+	value |= DMA_BUS_MODE_SFT_RESET;
+	writel(value, ioaddr + DMA_BUS_MODE);
+
+	return readl_poll_timeout(ioaddr + DMA_BUS_MODE, value,
+				  !(value & DMA_BUS_MODE_SFT_RESET),
+				  10000, 2000000);
+}
+
 static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	struct plat_stmmacenet_data *plat;
@@ -566,6 +579,7 @@ static int loongson_dwmac_probe(struct pci_dev *pdev, const struct pci_device_id
 
 	plat->bsp_priv = ld;
 	plat->setup = loongson_dwmac_setup;
+	plat->fix_soc_reset = loongson_dwmac_fix_reset;
 	ld->dev = &pdev->dev;
 	ld->loongson_id = readl(res.addr + GMAC_VERSION) & 0xff;
 

base-commit: a64dcfb451e254085a7daee5fe51bf22959d52d3
-- 
2.43.0