phy: cadence-torrent: Do not configure SERDES if it's already configured

Do not configure torrent SERDES if it's already configured.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Reviewed-by: Swapnil Jakhade <sjakhade@cadence.com>
Link: https://lore.kernel.org/r/20210330110138.24356-4-kishon@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/cadence/phy-cadence-torrent.c

@@ -371,6 +371,10 @@ static const struct phy_ops cdns_torrent_phy_ops = {
 	.owner		= THIS_MODULE,
 };
 
+static const struct phy_ops noop_ops = {
+	.owner		= THIS_MODULE,
+};
+
 struct cdns_reg_pairs {
 	u32 val;
 	u32 off;
@@ -2306,6 +2310,7 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 	struct device_node *child;
 	int ret, subnodes, node = 0, i;
 	u32 total_num_lanes = 0;
+	int already_configured;
 	u8 init_dp_regmap = 0;
 	u32 phy_type;
 
@@ -2344,6 +2349,9 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	regmap_field_read(cdns_phy->phy_pma_cmn_ctrl_1, &already_configured);
+
+	if (!already_configured) {
 		ret = cdns_torrent_reset(cdns_phy);
 		if (ret)
 			goto clk_cleanup;
@@ -2354,6 +2362,7 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 
 		/* Enable APB */
 		reset_control_deassert(cdns_phy->apb_rst);
+	}
 
 	for_each_available_child_of_node(dev->of_node, child) {
 		struct phy *gphy;
@@ -2423,7 +2432,10 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 		of_property_read_u32(child, "cdns,ssc-mode",
 				     &cdns_phy->phys[node].ssc_mode);
 
+		if (!already_configured)
 			gphy = devm_phy_create(dev, child, &cdns_torrent_phy_ops);
+		else
+			gphy = devm_phy_create(dev, child, &noop_ops);
 		if (IS_ERR(gphy)) {
 			ret = PTR_ERR(gphy);
 			goto put_child;
@@ -2507,7 +2519,7 @@ static int cdns_torrent_phy_probe(struct platform_device *pdev)
 		goto put_lnk_rst;
 	}
 
-	if (cdns_phy->nsubnodes > 1) {
+	if (cdns_phy->nsubnodes > 1 && !already_configured) {
 		ret = cdns_torrent_phy_configure_multilink(cdns_phy);
 		if (ret)
 			goto put_lnk_rst;