net: phy: aquantia: save a local shadow of GLOBAL_CFG register values

Currently, aqr_gen2_fill_interface_modes() reads VEND1_GLOBAL_CFG_*
registers to populate phydev->supported_interfaces. But this is not
the only place which needs to read these registers. There is also
aqr107_read_rate().

Based on the premise that these values are statically set by firmware
and the driver only needs to read them, the proposal is to read them
only once, at config_init() time, and use the cached values also in
aqr107_read_rate().

This patch only refactors the aqr_gen2_fill_interface_modes() code to
save the registers to driver memory, and to populate supported_interfaces
based on that.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20250821152022.1065237-7-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

2 files changed, 87 insertions, 31 deletions

diff --git a/drivers/net/phy/aquantia/aquantia.h b/drivers/net/phy/aquantia/aquantia.h
index 67ec6f7484af..492052cf1e6e 100644
--- a/drivers/net/phy/aquantia/aquantia.h
+++ b/drivers/net/phy/aquantia/aquantia.h
@@ -174,11 +174,38 @@ static const struct aqr107_hw_stat aqr107_hw_stats[] = {
 
 #define AQR107_SGMII_STAT_SZ ARRAY_SIZE(aqr107_hw_stats)
 
+static const struct {
+	int speed;
+	u16 reg;
+} aqr_global_cfg_regs[] = {
+	{ SPEED_10,	VEND1_GLOBAL_CFG_10M, },
+	{ SPEED_100,	VEND1_GLOBAL_CFG_100M, },
+	{ SPEED_1000,	VEND1_GLOBAL_CFG_1G, },
+	{ SPEED_2500,	VEND1_GLOBAL_CFG_2_5G, },
+	{ SPEED_5000,	VEND1_GLOBAL_CFG_5G, },
+	{ SPEED_10000,	VEND1_GLOBAL_CFG_10G, },
+};
+
+#define AQR_NUM_GLOBAL_CFG ARRAY_SIZE(aqr_global_cfg_regs)
+
+enum aqr_rate_adaptation {
+	AQR_RATE_ADAPT_NONE,
+	AQR_RATE_ADAPT_USX,
+	AQR_RATE_ADAPT_PAUSE,
+};
+
+struct aqr_global_syscfg {
+	int speed;
+	phy_interface_t interface;
+	enum aqr_rate_adaptation rate_adapt;
+};
+
 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;
+	struct aqr_global_syscfg global_cfg[AQR_NUM_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 21fdbda2a0e0..9d704b7e3dc8 100644
--- a/drivers/net/phy/aquantia/aquantia_main.c
+++ b/drivers/net/phy/aquantia/aquantia_main.c
@@ -860,44 +860,24 @@ static int aqr_gen1_config_init(struct phy_device *phydev)
 	return 0;
 }
 
-static const u16 aqr_global_cfg_regs[] = {
-	VEND1_GLOBAL_CFG_10M,
-	VEND1_GLOBAL_CFG_100M,
-	VEND1_GLOBAL_CFG_1G,
-	VEND1_GLOBAL_CFG_2_5G,
-	VEND1_GLOBAL_CFG_5G,
-	VEND1_GLOBAL_CFG_10G,
-};
-
-static int aqr_gen2_fill_interface_modes(struct phy_device *phydev)
+/* Walk the media-speed configuration registers to determine which
+ * host-side serdes modes may be used by the PHY depending on the
+ * negotiated media speed.
+ */
+static int aqr_gen2_read_global_syscfg(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, ret;
+	int i, val;
 
-	/* 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;
-	}
+	for (i = 0; i < AQR_NUM_GLOBAL_CFG; i++) {
+		struct aqr_global_syscfg *syscfg = &priv->global_cfg[i];
+
+		syscfg->speed = aqr_global_cfg_regs[i].speed;
 
-	/* Walk the media-speed configuration registers to determine which
-	 * host-side serdes modes may be used by the PHY depending on the
-	 * negotiated media speed.
-	 */
-	for (i = 0; i < ARRAY_SIZE(aqr_global_cfg_regs); i++) {
 		val = phy_read_mmd(phydev, MDIO_MMD_VEND1,
-				   aqr_global_cfg_regs[i]);
+				   aqr_global_cfg_regs[i].reg);
 		if (val < 0)
 			return val;
 
@@ -931,6 +911,55 @@ static int aqr_gen2_fill_interface_modes(struct phy_device *phydev)
 			break;
 		}
 
+		syscfg->interface = interface;
+
+		switch (rate_adapt) {
+		case VEND1_GLOBAL_CFG_RATE_ADAPT_NONE:
+			syscfg->rate_adapt = AQR_RATE_ADAPT_NONE;
+			break;
+		case VEND1_GLOBAL_CFG_RATE_ADAPT_USX:
+			syscfg->rate_adapt = AQR_RATE_ADAPT_USX;
+			break;
+		case VEND1_GLOBAL_CFG_RATE_ADAPT_PAUSE:
+			syscfg->rate_adapt = AQR_RATE_ADAPT_PAUSE;
+			break;
+		default:
+			phydev_warn(phydev, "unrecognized rate adapt mode %u\n",
+				    rate_adapt);
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static int aqr_gen2_fill_interface_modes(struct phy_device *phydev)
+{
+	unsigned long *possible = phydev->possible_interfaces;
+	struct aqr107_priv *priv = phydev->priv;
+	phy_interface_t interface;
+	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;
+	}
+
+	ret = aqr_gen2_read_global_syscfg(phydev);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < AQR_NUM_GLOBAL_CFG; i++) {
+		interface = priv->global_cfg[i].interface;
 		if (interface != PHY_INTERFACE_MODE_NA)
 			__set_bit(interface, possible);
 	}