[][kernel][gphy][Add CH395 solution to dsa, gsw]
[Description]
Add solution of CH395, which is an ethernet IC chip
from WCH company, to dsa, gsw for mt7981, mt7986.
1. For dsa, CR will be written in mediatek_ge.c
2. For gsw, CR will be written in mt7531.c
3. Enable mt7986 mediatek_ge.c config
[Release-log]
This patch will adjust RX min/max gain. Without this patch,
it may cause a link up fail for CH395 chip under 100Mbps.
In order to enhance the stability of your products,
it's better to merge this patch in your codebase.
Change-Id: If07b4ffc060defb5460ecf98339c1cdd3520a128
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7858068
diff --git a/target/linux/mediatek/files-5.4/drivers/net/phy/mediatek-ge.c b/target/linux/mediatek/files-5.4/drivers/net/phy/mediatek-ge.c
index 977a90b..60ef22c 100644
--- a/target/linux/mediatek/files-5.4/drivers/net/phy/mediatek-ge.c
+++ b/target/linux/mediatek/files-5.4/drivers/net/phy/mediatek-ge.c
@@ -11,6 +11,10 @@
#define MTK_PHY_PAGE_EXTENDED_2A30 0x2a30
#define MTK_PHY_PAGE_EXTENDED_52B5 0x52b5
+#define MTK_PHY_RG_DEV1E_REG2C7 0x2c7
+#define MTK_PHY_MAX_GAIN_MASK GENMASK(4, 0)
+#define MTK_PHY_MIN_GAIN_MASK GENMASK(12, 8)
+
static int mtk_gephy_read_page(struct phy_device *phydev)
{
return __phy_read(phydev, MTK_EXT_PAGE_ACCESS);
@@ -65,6 +69,11 @@
phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x13, 0x404);
phy_write_mmd(phydev, MDIO_MMD_VEND1, 0x14, 0x404);
+ /* Adjust RX min/max gain to fix CH395 100Mbps link up fail */
+ phy_write_mmd(phydev, MDIO_MMD_VEND1, MTK_PHY_RG_DEV1E_REG2C7,
+ FIELD_PREP(MTK_PHY_MAX_GAIN_MASK, 0x8) |
+ FIELD_PREP(MTK_PHY_MIN_GAIN_MASK, 0x13));
+
return 0;
}