linux-kernel - [PATCH v2 1/5] phy: ti: j721e-wiz: Do not configure wiz if its already configured

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Date:   Tue, 30 Mar 2021 16:31:34 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     Swapnil Jakhade <sjakhade@...ence.com>,
        <linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        Lokesh Vutla <lokeshvutla@...com>
Subject: [PATCH v2 1/5] phy: ti: j721e-wiz: Do not 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.

Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/ti/phy-j721e-wiz.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
index 659597645201..95905e5c4f3d 100644
--- a/drivers/phy/ti/phy-j721e-wiz.c
+++ b/drivers/phy/ti/phy-j721e-wiz.c
@@ -1132,13 +1132,14 @@ 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;
+	int ret, val, i;
 	u32 num_lanes;
-	int ret;
 
 	wiz = devm_kzalloc(dev, sizeof(*wiz), GFP_KERNEL);
 	if (!wiz)
@@ -1266,10 +1267,20 @@ static int wiz_probe(struct platform_device *pdev)
 		goto err_get_sync;
 	}
 
-	ret = wiz_init(wiz);
-	if (ret) {
-		dev_err(dev, "WIZ initialization failed\n");
-		goto err_wiz_init;
+	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_init(wiz);
+		if (ret) {
+			dev_err(dev, "WIZ initialization failed\n");
+			goto err_wiz_init;
+		}
 	}
 
 	serdes_pdev = of_platform_device_create(child_node, NULL, dev);
-- 
2.17.1