[PATCH 3/3] PCI: keystone: Remove device links to PHY

[vladimir.oltean at nxp.com]

This is a partial revert of the device link pieces from commit
49229238ab47 ("PCI: keystone: Cleanup PHY handling").

The trouble with this is that a PHY consumer driver dereferences fields
from struct phy, which will become no longer possible.

Since commit 987351e1ea77 ("phy: core: Add consumer device link
support") from 2019, the PHY core also adds a device link to order
PHY provider and consumer suspend/resume operations. The reverted
functionality is from 2018, and is redundant with the PHY core now.

Signed-off-by: Vladimir Oltean <vladimir.oltean at nxp.com>
---
 drivers/pci/controller/dwc/pci-keystone.c | 31 +++--------------------
 1 file changed, 4 insertions(+), 27 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 602516239a57..bd736a1624bc 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -129,7 +129,6 @@ struct keystone_pcie {
 	int			num_lanes;
 	u32			num_viewport;
 	struct phy		**phy;
-	struct device_link	**link;
 	struct			device_node *msi_intc_np;
 	struct irq_domain	*intx_irq_domain;
 	struct device_node	*np;
@@ -1131,7 +1130,6 @@ static int ks_pcie_probe(struct platform_device *pdev)
 	enum dw_pcie_device_mode mode;
 	struct dw_pcie *pci;
 	struct keystone_pcie *ks_pcie;
-	struct device_link **link;
 	struct gpio_desc *gpiod;
 	struct resource *res;
 	void __iomem *base;
@@ -1202,31 +1200,17 @@ static int ks_pcie_probe(struct platform_device *pdev)
 	if (!phy)
 		return -ENOMEM;
 
-	link = devm_kcalloc(dev, num_lanes, sizeof(*link), GFP_KERNEL);
-	if (!link)
-		return -ENOMEM;
-
 	for (i = 0; i < num_lanes; i++) {
 		snprintf(name, sizeof(name), "pcie-phy%d", i);
 		phy[i] = devm_phy_optional_get(dev, name);
 		if (IS_ERR(phy[i])) {
 			ret = PTR_ERR(phy[i]);
-			goto err_link;
-		}
-
-		if (!phy[i])
-			continue;
-
-		link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
-		if (!link[i]) {
-			ret = -EINVAL;
-			goto err_link;
+			goto err;
 		}
 	}
 
 	ks_pcie->np = np;
 	ks_pcie->pci = pci;
-	ks_pcie->link = link;
 	ks_pcie->num_lanes = num_lanes;
 	ks_pcie->phy = phy;
 
@@ -1236,7 +1220,7 @@ static int ks_pcie_probe(struct platform_device *pdev)
 		ret = PTR_ERR(gpiod);
 		if (ret != -EPROBE_DEFER)
 			dev_err(dev, "Failed to get reset GPIO\n");
-		goto err_link;
+		goto err;
 	}
 
 	/* Obtain references to the PHYs */
@@ -1251,7 +1235,7 @@ static int ks_pcie_probe(struct platform_device *pdev)
 
 	if (ret) {
 		dev_err(dev, "failed to enable phy\n");
-		goto err_link;
+		goto err;
 	}
 
 	platform_set_drvdata(pdev, ks_pcie);
@@ -1338,25 +1322,18 @@ static int ks_pcie_probe(struct platform_device *pdev)
 	pm_runtime_disable(dev);
 	ks_pcie_disable_phy(ks_pcie);
 
-err_link:
-	while (--i >= 0 && link[i])
-		device_link_del(link[i]);
-
+err:
 	return ret;
 }
 
 static void ks_pcie_remove(struct platform_device *pdev)
 {
 	struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
-	struct device_link **link = ks_pcie->link;
-	int num_lanes = ks_pcie->num_lanes;
 	struct device *dev = &pdev->dev;
 
 	pm_runtime_put(dev);
 	pm_runtime_disable(dev);
 	ks_pcie_disable_phy(ks_pcie);
-	while (num_lanes--)
-		device_link_del(link[num_lanes]);
 }
 
 static struct platform_driver ks_pcie_driver = {
-- 
2.43.0