[PATCH net v2 3/5] net: bcmgenet: do not skip WoL power up on GENET V1

bcmgenet_power_up() had an early check for bcmgenet_has_ext(priv) before
dispatching by power mode. GENET V1 does not have the EXT block (unlike
GENET V2+), which causes bcmgenet_power_up() to immediately return 0.

As a consequence, when waking up from GENET_POWER_WOL_MAGIC on GENET V1,
bcmgenet_wol_power_up_cfg() is never invoked to disable the WoL clock,
clear wake event masks, and restore normal PHY and MAC operations.

Move the bcmgenet_has_ext() checks to the GENET_POWER_PASSIVE and
GENET_POWER_CABLE_SENSE cases where the EXT registers are actually
accessed, allowing GENET_POWER_WOL_MAGIC cleanup to execute on all
hardware versions.

Fixes: c3ae64ae0c08 ("net: bcmgenet: handle GENET_POWER_WOL_MAGIC")
Assisted-by: LLM
Reviewed-by: Nicolai Buchwitz <redacted>
Siged-off-by: Florian Fainelli [off-list ref]
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index 055e1362173b..bfb74dca55d6 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c

@@ -1762,13 +1762,12 @@ static int bcmgenet_power_up(struct bcmgenet_priv *priv,
 	int ret = 0;
 	u32 reg;
 
-	if (!bcmgenet_has_ext(priv))
-		return ret;
-
-	reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
-
 	switch (mode) {
 	case GENET_POWER_PASSIVE:
+		if (!bcmgenet_has_ext(priv))
+			break;
+
+		reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 		reg &= ~(EXT_PWR_DOWN_DLL | EXT_PWR_DOWN_BIAS |
 			 EXT_ENERGY_DET_MASK);
 		if (GENET_IS_V5(priv) && !bcmgenet_has_ephy_16nm(priv)) {

@@ -1792,8 +1791,12 @@ static int bcmgenet_power_up(struct bcmgenet_priv *priv,
 		break;
 
 	case GENET_POWER_CABLE_SENSE:
+		if (!bcmgenet_has_ext(priv))
+			break;
+
 		/* enable APD */
 		if (!GENET_IS_V5(priv)) {
+			reg = bcmgenet_ext_readl(priv, EXT_EXT_PWR_MGMT);
 			reg |= EXT_PWR_DN_EN_LD;
 			bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
 		}

-- 
2.34.1