I'm unsure whether intentionate or not, but I think the (partially
observed) naming convention in this driver is that function prefixes
denote the earliest generation when a feature is available. In case of
aqr107_fill_interface_modes(), that means that the GLOBAL_CFG registers
are a Gen2 feature. Supporting evidence: the AQR105, a Gen1 PHY, does
not have these registers, thus the function is not named aqr105_*.

Based on this inferred naming scheme, I am proposing a refinement of
commit a7f3abcf6357 ("net: phy: aquantia: only poll GLOBAL_CFG regs on
aqr113, aqr113c and aqr115c") which introduced aqr113c_fill_interface_modes(),
suggesting this may be a Gen4 PHY feature.

The long-term goal is for aqr107_config_init() to tail-call
aqr107_fill_interface_modes(), such that the latter function is also
called by AQR107 itself, and many other PHY drivers. Currently it can't,
because aqr113c_config_init() calls aqr107_config_init() and then
aqr113c_fill_interface_modes(). So this would lead to a duplicate call
to aqr107_fill_interface_modes() for AQR113C.

Centralize the reading of GLOBAL_CFG registers in the AQR107 method, and
create a boolean, set to true by AQR113C, which tests whether waiting
for a non-zero value in the GLOBAL_CFG_100M register is necessary.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/phy/aquantia/aquantia.h      |  1 +
 drivers/net/phy/aquantia/aquantia_main.c | 41 ++++++++++++------------
 2 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/drivers/net/phy/aquantia/aquantia.h b/drivers/net/phy/aquantia/aquantia.h
index 0c78bfabace5..67ec6f7484af 100644
--- a/drivers/net/phy/aquantia/aquantia.h
+++ b/drivers/net/phy/aquantia/aquantia.h
@@ -178,6 +178,7 @@ struct aqr107_priv {
 	u64 sgmii_stats[AQR107_SGMII_STAT_SZ];
 	unsigned long leds_active_low;
 	unsigned long leds_active_high;
+	bool wait_on_global_cfg;
 };
 
 #if IS_REACHABLE(CONFIG_HWMON)
diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
index 52facd318c83..b9b58c6ce686 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -991,9 +991,24 @@ static const u16 aqr_global_cfg_regs[] = {
 static int aqr107_fill_interface_modes(struct phy_device *phydev)
 {
 	unsigned long *possible = phydev->possible_interfaces;
+	struct aqr107_priv *priv = phydev->priv;
 	unsigned int serdes_mode, rate_adapt;
 	phy_interface_t interface;
-	int i, val;
+	int i, val, ret;
+
+	/* It's been observed on some models that - when coming out of suspend
+	 * - the FW signals that the PHY is ready but the GLOBAL_CFG registers
+	 * continue on returning zeroes for some time. Let's poll the 100M
+	 * register until it returns a real value as both 113c and 115c support
+	 * this mode.
+	 */
+	if (priv->wait_on_global_cfg) {
+		ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
+						VEND1_GLOBAL_CFG_100M, val,
+						val != 0, 1000, 100000, false);
+		if (ret)
+			return ret;
+	}
 
 	/* Walk the media-speed configuration registers to determine which
 	 * host-side serdes modes may be used by the PHY depending on the
@@ -1042,25 +1057,6 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
 	return 0;
 }
 
-static int aqr113c_fill_interface_modes(struct phy_device *phydev)
-{
-	int val, ret;
-
-	/* It's been observed on some models that - when coming out of suspend
-	 * - the FW signals that the PHY is ready but the GLOBAL_CFG registers
-	 * continue on returning zeroes for some time. Let's poll the 100M
-	 * register until it returns a real value as both 113c and 115c support
-	 * this mode.
-	 */
-	ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
-					VEND1_GLOBAL_CFG_100M, val, val != 0,
-					1000, 100000, false);
-	if (ret)
-		return ret;
-
-	return aqr107_fill_interface_modes(phydev);
-}
-
 static int aqr115c_get_features(struct phy_device *phydev)
 {
 	unsigned long *supported = phydev->supported;
@@ -1088,8 +1084,11 @@ static int aqr111_get_features(struct phy_device *phydev)
 
 static int aqr113c_config_init(struct phy_device *phydev)
 {
+	struct aqr107_priv *priv = phydev->priv;
 	int ret;
 
+	priv->wait_on_global_cfg = true;
+
 	ret = aqr107_config_init(phydev);
 	if (ret < 0)
 		return ret;
@@ -1103,7 +1102,7 @@ static int aqr113c_config_init(struct phy_device *phydev)
 	if (ret)
 		return ret;
 
-	return aqr113c_fill_interface_modes(phydev);
+	return aqr107_fill_interface_modes(phydev);
 }
 
 static int aqr107_probe(struct phy_device *phydev)
-- 
2.34.1