linux-kernel - [PATCH 3/9] phy: ti: j721e-wiz: Don't configure wiz if its already configured

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Date:   Tue, 3 Nov 2020 09:25:50 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     Swapnil Kashinath Jakhade <sjakhade@...ence.com>,
        Milind Parab <mparab@...ence.com>,
        Yuti Suresh Amonkar <yamonkar@...ence.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 3/9] phy: ti: j721e-wiz: Don't configure wiz if its already configured

From: Faiz Abbas <faiz_abbas@...com>

Serdes lanes might be shared between multiple cores in some usecases
and its not possible to lock PLLs for both the lanes independently
by the two cores. This requires a bootloader to configure both the
lanes at early boot time.

To handle this case, skip all configuration if any of the lanes has
already been enabled.

While we are here, also fix the wiz_init() to be called before the
of_platform_device_create() call.

Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/ti/phy-j721e-wiz.c | 36 +++++++++++++++++++++-------------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
index d57d29382ce4..9786e8aec252 100644
--- a/drivers/phy/ti/phy-j721e-wiz.c
+++ b/drivers/phy/ti/phy-j721e-wiz.c
@@ -816,13 +816,14 @@ static int wiz_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *node = dev->of_node;
 	struct platform_device *serdes_pdev;
+	bool already_configured = false;
 	struct device_node *child_node;
 	struct regmap *regmap;
 	struct resource res;
 	void __iomem *base;
 	struct wiz *wiz;
 	u32 num_lanes;
-	int ret;
+	int ret, val, i;
 
 	wiz = devm_kzalloc(dev, sizeof(*wiz), GFP_KERNEL);
 	if (!wiz)
@@ -944,10 +945,26 @@ static int wiz_probe(struct platform_device *pdev)
 		goto err_get_sync;
 	}
 
-	ret = wiz_clock_init(wiz, node);
-	if (ret < 0) {
-		dev_warn(dev, "Failed to initialize clocks\n");
-		goto err_get_sync;
+	for (i = 0; i < wiz->num_lanes; i++) {
+		regmap_field_read(wiz->p_enable[i], &val);
+		if (val & (P_ENABLE | P_ENABLE_FORCE)) {
+			already_configured = true;
+			break;
+		}
+	}
+
+	if (!already_configured) {
+		ret = wiz_clock_init(wiz, node);
+		if (ret < 0) {
+			dev_warn(dev, "Failed to initialize clocks\n");
+			goto err_get_sync;
+		}
+
+		ret = wiz_init(wiz);
+		if (ret) {
+			dev_err(dev, "WIZ initialization failed\n");
+			goto err_pdev_create;
+		}
 	}
 
 	serdes_pdev = of_platform_device_create(child_node, NULL, dev);
@@ -958,18 +975,9 @@ static int wiz_probe(struct platform_device *pdev)
 	}
 	wiz->serdes_pdev = serdes_pdev;
 
-	ret = wiz_init(wiz);
-	if (ret) {
-		dev_err(dev, "WIZ initialization failed\n");
-		goto err_wiz_init;
-	}
-
 	of_node_put(child_node);
 	return 0;
 
-err_wiz_init:
-	of_platform_device_destroy(&serdes_pdev->dev, NULL);
-
 err_pdev_create:
 	wiz_clock_cleanup(wiz, node);
 
-- 
2.17.1