net: pse-pd: Fix enabled status mismatch

PSE controllers like the TPS23881 can forcefully turn off their
configuration state. In such cases, the is_enabled() and get_status()
callbacks will report the PSE as disabled, while admin_state_enabled
will show it as enabled. This mismatch can lead the user to attempt
to enable it, but no action is taken as admin_state_enabled remains set.

The solution is to disable the PSE before enabling it, ensuring the
actual status matches admin_state_enabled.

Fixes: d83e137 ("net: pse-pd: Use regulator framework within PSE framework")
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241002121706.246143-1-kory.maincent@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/pse-pd/pse_core.c

@@ -785,6 +785,17 @@ static int pse_ethtool_c33_set_config(struct pse_control *psec,
 	 */
 	switch (config->c33_admin_control) {
 	case ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED:
+		/* We could have mismatch between admin_state_enabled and
+		 * state reported by regulator_is_enabled. This can occur when
+		 * the PI is forcibly turn off by the controller. Call
+		 * regulator_disable on that case to fix the counters state.
+		 */
+		if (psec->pcdev->pi[psec->id].admin_state_enabled &&
+		    !regulator_is_enabled(psec->ps)) {
+			err = regulator_disable(psec->ps);
+			if (err)
+				break;
+		}
 		if (!psec->pcdev->pi[psec->id].admin_state_enabled)
 			err = regulator_enable(psec->ps);
 		break;