openwrt/package/boot/uboot-mediatek/patches/001-mtk-0018-net-mediatek-use-regmap-api-to-modify-ethsys-registe.patch

From 955cc76d8074df943d59d559895007f91de8eed5 Mon Sep 17 00:00:00 2001
From: Weijie Gao <weijie.gao@mediatek.com>
Date: Fri, 20 May 2022 11:23:37 +0800
Subject: [PATCH 18/25] net: mediatek: use regmap api to modify ethsys
 registers

The address returned by regmap_get_range() is not remapped. Directly r/w
to this address is ok for ARM platforms since it's idential to the virtual
address.

But for MIPS platform only virtual address should be used for access.
To solve this issue, the regmap api regmap_read/regmap_write should be used
since they will remap address before accessing.

Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
---
 drivers/net/mtk_eth.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

--- a/drivers/net/mtk_eth.c
+++ b/drivers/net/mtk_eth.c
@@ -159,9 +159,10 @@ struct mtk_eth_priv {
 
 	void __iomem *fe_base;
 	void __iomem *gmac_base;
-	void __iomem *ethsys_base;
 	void __iomem *sgmii_base;
 
+	struct regmap *ethsys_regmap;
+
 	struct mii_dev *mdio_bus;
 	int (*mii_read)(struct mtk_eth_priv *priv, u8 phy, u8 reg);
 	int (*mii_write)(struct mtk_eth_priv *priv, u8 phy, u8 reg, u16 val);
@@ -233,7 +234,12 @@ static void mtk_gmac_rmw(struct mtk_eth_
 static void mtk_ethsys_rmw(struct mtk_eth_priv *priv, u32 reg, u32 clr,
 			   u32 set)
 {
-	clrsetbits_le32(priv->ethsys_base + reg, clr, set);
+	uint val;
+
+	regmap_read(priv->ethsys_regmap, reg, &val);
+	val &= ~clr;
+	val |= set;
+	regmap_write(priv->ethsys_regmap, reg, val);
 }
 
 /* Direct MDIO clause 22/45 access via SoC */
@@ -1427,15 +1433,9 @@ static int mtk_eth_of_to_plat(struct ude
 	if (ret)
 		return ret;
 
-	regmap = syscon_node_to_regmap(args.node);
-	if (IS_ERR(regmap))
-		return PTR_ERR(regmap);
-
-	priv->ethsys_base = regmap_get_range(regmap, 0);
-	if (!priv->ethsys_base) {
-		dev_err(dev, "Unable to find ethsys\n");
-		return -ENODEV;
-	}
+	priv->ethsys_regmap = syscon_node_to_regmap(args.node);
+	if (IS_ERR(priv->ethsys_regmap))
+		return PTR_ERR(priv->ethsys_regmap);
 
 	/* Reset controllers */
 	ret = reset_get_by_name(dev, "fe", &priv->rst_fe);