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20c64dabb6
The patch was wrongly removed by a kernel version bump to 4.9.106 in the believe that it was merged upstream thow it wasn't. This lead to unrecoverable link losses on devices which use those PHYs such as many ubnt single-port CPEs. Fixes:6f8eb1b50f("kernel: bump 4.9 to 4.9.106 for 18.06") Signed-off-by: Daniel Golle <daniel@makrotopia.org> (cherry picked from commita497e47762)
55 lines
1.5 KiB
Diff
55 lines
1.5 KiB
Diff
From: Roman Yeryomin <roman@advem.lv>
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Subject: kernel: add at803x fix for sgmii mode
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Some (possibly broken) bootloaders incorreclty initialize at8033
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phy. This patch enables sgmii autonegotiation mode.
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[john@phrozen.org: felix added this to his upstream queue]
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Signed-off-by: Roman Yeryomin <roman@advem.lv>
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---
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drivers/net/phy/at803x.c | 25 +++++++++++++++++++++++++
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1 file changed, 25 insertions(+)
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--- a/drivers/net/phy/at803x.c
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+++ b/drivers/net/phy/at803x.c
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@@ -55,6 +55,10 @@
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#define AT803X_DEBUG_ADDR 0x1D
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#define AT803X_DEBUG_DATA 0x1E
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+#define AT803X_REG_CHIP_CONFIG 0x1f
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+#define AT803X_BT_BX_REG_SEL 0x8000
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+#define AT803X_SGMII_ANEG_EN 0x1000
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+
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#define AT803X_MODE_CFG_MASK 0x0F
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#define AT803X_MODE_CFG_SGMII 0x01
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@@ -295,6 +299,27 @@ static int at803x_config_init(struct phy
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{
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struct at803x_platform_data *pdata;
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int ret;
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+ u32 v;
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+
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+ if (phydev->drv->phy_id == ATH8031_PHY_ID &&
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+ phydev->interface == PHY_INTERFACE_MODE_SGMII)
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+ {
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+ v = phy_read(phydev, AT803X_REG_CHIP_CONFIG);
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+ /* select SGMII/fiber page */
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+ ret = phy_write(phydev, AT803X_REG_CHIP_CONFIG,
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+ v & ~AT803X_BT_BX_REG_SEL);
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+ if (ret)
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+ return ret;
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+ /* enable SGMII autonegotiation */
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+ ret = phy_write(phydev, MII_BMCR, AT803X_SGMII_ANEG_EN);
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+ if (ret)
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+ return ret;
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+ /* select copper page */
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+ ret = phy_write(phydev, AT803X_REG_CHIP_CONFIG,
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+ v | AT803X_BT_BX_REG_SEL);
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+ if (ret)
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+ return ret;
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+ }
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ret = genphy_config_init(phydev);
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if (ret < 0)
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