ramips: fix AR8033 fiber operation

It was reported AR8033 did not work in fiber operation mode on the ER-X.

While the earlier attempt of fixing this mitigated the issue of 1000
Base-X link mode not being supported, it also switched to the copper
page, breaking fiber operation altogether.

Extend the hack adding fiber operation so it does not switch to the
copper page. Also remove the part where the supported link mode bit for
1000 Base-X is removed, as this is required for fiber operation.

Signed-off-by: David Bauer <mail@david-bauer.net>

target/linux/ramips/patches-5.10/710-at803x.patch

@@ -118,7 +118,23 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
-@@ -744,6 +818,10 @@ static int at803x_read_status(struct phy
+@@ -554,6 +628,7 @@ static int at803x_probe(struct phy_devic
+ 			return ret;
+ 	}
+
++#if 0
+ 	/* Some bootloaders leave the fiber page selected.
+ 	 * Switch to the copper page, as otherwise we read
+ 	 * the PHY capabilities from the fiber side.
+@@ -565,6 +640,7 @@ static int at803x_probe(struct phy_devic
+ 		if (ret)
+ 			goto err;
+ 	}
++#endif
+
+ 	return 0;
+
+@@ -744,6 +820,10 @@ static int at803x_read_status(struct phy
  {
  	int ss, err, old_link = phydev->link;
 
@@ -129,7 +145,7 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
  	/* Update the link, but return if there was an error */
  	err = genphy_update_link(phydev);
  	if (err)
-@@ -844,6 +922,12 @@ static int at803x_config_aneg(struct phy
+@@ -844,6 +924,12 @@ static int at803x_config_aneg(struct phy
  {
  	int ret;
 
@@ -142,7 +158,23 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
  	ret = at803x_config_mdix(phydev, phydev->mdix_ctrl);
  	if (ret < 0)
  		return ret;
-@@ -1145,6 +1229,7 @@ static struct phy_driver at803x_driver[]
+@@ -943,6 +1029,7 @@ static int at803x_get_features(struct ph
+ 	if (err)
+ 		return err;
+
++#if 0
+ 	if (!at803x_match_phy_id(phydev, ATH8031_PHY_ID))
+ 		return 0;
+
+@@ -960,6 +1047,7 @@ static int at803x_get_features(struct ph
+ 	 */
+ 	linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+ 			   phydev->supported);
++#endif
+ 	return 0;
+ }
+
+@@ -1173,6 +1261,7 @@ static struct phy_driver at803x_driver[]
  	/* Qualcomm Atheros AR8031/AR8033 */
  	PHY_ID_MATCH_EXACT(ATH8031_PHY_ID),
  	.name			= "Qualcomm Atheros AR8031/AR8033",

target/linux/ramips/patches-5.4/991-at803x.patch

@@ -42,7 +42,7 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
 
  #define AT803X_DEBUG_REG_0			0x00
  #define AT803X_DEBUG_RX_CLK_DLY_EN		BIT(15)
-@@ -274,12 +285,73 @@ static int at803x_resume(struct phy_devi
+@@ -274,18 +285,80 @@ static int at803x_resume(struct phy_devi
  	return phy_modify(phydev, MII_BMCR, BMCR_PDOWN | BMCR_ISOLATE, 0);
  }
 
@@ -116,7 +116,38 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
  	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  	if (!priv)
  		return -ENOMEM;
-@@ -415,6 +487,10 @@ static int at803x_read_status(struct phy
+
+ 	phydev->priv = priv;
+
++#if 0
+ 	/* Some bootloaders leave the fiber page selected.
+ 	 * Switch to the copper page, as otherwise we read
+ 	 * the PHY capabilities from the fiber side.
+@@ -295,6 +368,7 @@ static int at803x_probe(struct phy_devic
+ 		ret = at803x_write_page(phydev, AT803X_PAGE_COPPER);
+ 		mutex_unlock(&phydev->mdio.bus->mdio_lock);
+ 	}
++#endif
+
+ 	return ret;
+ }
+@@ -419,6 +493,7 @@ static int at803x_get_features(struct ph
+ 	if (err)
+ 		return err;
+
++#if 0
+ 	if (!(phydev->phy_id & phydev->drv->phy_id_mask) == (ATH8031_PHY_ID & phydev->drv->phy_id_mask))
+ 		return 0;
+
+@@ -436,6 +511,7 @@ static int at803x_get_features(struct ph
+ 	 */
+ 	linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+ 			   phydev->supported);
++#endif
+ 	return 0;
+ }
+
+@@ -443,6 +519,10 @@ static int at803x_read_status(struct phy
  {
  	int ss, err, old_link = phydev->link;
 
@@ -127,7 +158,7 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
  	/* Update the link, but return if there was an error */
  	err = genphy_update_link(phydev);
  	if (err)
-@@ -469,6 +545,19 @@ static int at803x_read_status(struct phy
+@@ -497,6 +577,19 @@ static int at803x_read_status(struct phy
  	return 0;
  }
 
@@ -147,7 +178,7 @@ Signed-off-by: René van Dorst <opensource@vdorst.com>
  static struct phy_driver at803x_driver[] = {
  {
  	/* ATHEROS 8035 */
-@@ -504,6 +593,7 @@ static struct phy_driver at803x_driver[]
+@@ -532,6 +625,7 @@ static struct phy_driver at803x_driver[]
  	/* ATHEROS 8031 */
  	.phy_id			= ATH8031_PHY_ID,
  	.name			= "Atheros 8031 ethernet",