[PATCH v9 3/3] PCI: Remove device links to PHY

This is practically a full revert of commit
7a4db656a635 ("PCI: dra7xx: Create functional dependency between PCIe and PHY")
and a partial revert of the device link pieces from commits
dfb80534692d ("PCI: cadence: Add generic PHY support to host and EP drivers")
49229238ab47 ("PCI: keystone: Cleanup PHY handling")

The trouble with these commits is that they dereference fields inside
struct phy from a consumer driver, 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. All reverted commits
are from 2017-2018, and what they do should actually be redundant now.

Signed-off-by: Vladimir Oltean <[email protected]>
Acked-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
---
Cc: Lorenzo Pieralisi <[email protected]>
Cc: "Krzysztof Wilczyński" <[email protected]>
Cc: Manivannan Sadhasivam <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
Cc: Vignesh Raghavendra <[email protected]>
Cc: Siddharth Vadapalli <[email protected]>

v8->v9: none
v7->v8: only context change - "return 0" became "return ret" for
        cdns_plat_pcie_probe()
v6->v7: none
v5->v6: collect tag from Manivannan Sadhasivam
v3->v5: none
v2->v3:
- remove dangling set but unused phy_count local variable in
  cdns_plat_pcie_probe()
v1->v2:
- fully remove struct device link **link from struct cdns_pcie and from
  cdns_plat_pcie_probe() error path
- collect tag from Bjorn Helgaas
- adjust commit title
---
 .../controller/cadence/pcie-cadence-plat.c    |  4 ---
 drivers/pci/controller/cadence/pcie-cadence.c | 16 +---------
 drivers/pci/controller/cadence/pcie-cadence.h |  2 --
 drivers/pci/controller/dwc/pci-dra7xx.c       | 16 ----------
 drivers/pci/controller/dwc/pci-keystone.c     | 31 +++----------------
 5 files changed, 5 insertions(+), 64 deletions(-)

diff --git a/drivers/pci/controller/cadence/pcie-cadence-plat.c b/drivers/pci/controller/cadence/pcie-cadence-plat.c
index 8aed8b4c3e11..13edc6be21f5 100644
--- a/drivers/pci/controller/cadence/pcie-cadence-plat.c
+++ b/drivers/pci/controller/cadence/pcie-cadence-plat.c
@@ -41,7 +41,6 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 	struct pci_host_bridge *bridge;
 	struct cdns_pcie_ep *ep;
 	struct cdns_pcie_rc *rc;
-	int phy_count;
 	bool is_rc;
 	int ret;
 
@@ -122,9 +121,6 @@ static int cdns_plat_pcie_probe(struct platform_device *pdev)
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
 	cdns_pcie_disable_phy(cdns_plat_pcie->pcie);
-	phy_count = cdns_plat_pcie->pcie->phy_count;
-	while (phy_count--)
-		device_link_del(cdns_plat_pcie->pcie->link[phy_count]);
 
 	return ret;
 }
diff --git a/drivers/pci/controller/cadence/pcie-cadence.c b/drivers/pci/controller/cadence/pcie-cadence.c
index a1eada56edba..0ac980249941 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.c
+++ b/drivers/pci/controller/cadence/pcie-cadence.c
@@ -222,7 +222,6 @@ int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
 	struct device_node *np = dev->of_node;
 	int phy_count;
 	struct phy **phy;
-	struct device_link **link;
 	int i;
 	int ret;
 	const char *name;
@@ -238,10 +237,6 @@ int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
 	if (!phy)
 		return -ENOMEM;
 
-	link = devm_kcalloc(dev, phy_count, sizeof(*link), GFP_KERNEL);
-	if (!link)
-		return -ENOMEM;
-
 	for (i = 0; i < phy_count; i++) {
 		of_property_read_string_index(np, "phy-names", i, &name);
 		phy[i] = devm_phy_get(dev, name);
@@ -249,17 +244,10 @@ int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
 			ret = PTR_ERR(phy[i]);
 			goto err_phy;
 		}
-		link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
-		if (!link[i]) {
-			devm_phy_put(dev, phy[i]);
-			ret = -EINVAL;
-			goto err_phy;
-		}
 	}
 
 	pcie->phy_count = phy_count;
 	pcie->phy = phy;
-	pcie->link = link;
 
 	ret =  cdns_pcie_enable_phy(pcie);
 	if (ret)
@@ -268,10 +256,8 @@ int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
 	return 0;
 
 err_phy:
-	while (--i >= 0) {
-		device_link_del(link[i]);
+	while (--i >= 0)
 		devm_phy_put(dev, phy[i]);
-	}
 
 	return ret;
 }
diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
index b4d51adefea5..4a96e1869e53 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -260,7 +260,6 @@ struct cdns_plat_pcie_of_data {
  * @is_hpa: indicates if the architecture is HPA
  * @phy_count: number of supported PHY devices
  * @phy: list of pointers to specific PHY control blocks
- * @link: list of pointers to corresponding device link representations
  * @ops: Platform-specific ops to control various inputs from Cadence PCIe
  *       wrapper
  * @cdns_pcie_reg_offsets: Register bank offsets for different SoC
@@ -276,7 +275,6 @@ struct cdns_pcie {
 	bool				     is_hpa;
 	int			             phy_count;
 	struct phy		             **phy;
-	struct device_link	             **link;
 	const  struct cdns_pcie_ops          *ops;
 	const  struct cdns_plat_pcie_of_data *cdns_pcie_reg_offsets;
 	int				     max_link_speed;
diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 3fc889944f02..bf6c5b86bb27 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -9,7 +9,6 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/device.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
@@ -678,7 +677,6 @@ static int dra7xx_pcie_probe(struct platform_device *pdev)
 	int i;
 	int phy_count;
 	struct phy **phy;
-	struct device_link **link;
 	void __iomem *base;
 	struct dw_pcie *pci;
 	struct dra7xx_pcie *dra7xx;
@@ -726,10 +724,6 @@ static int dra7xx_pcie_probe(struct platform_device *pdev)
 	if (!phy)
 		return -ENOMEM;
 
-	link = devm_kcalloc(dev, phy_count, sizeof(*link), GFP_KERNEL);
-	if (!link)
-		return -ENOMEM;
-
 	dra7xx->clk = devm_clk_get_optional(dev, NULL);
 	if (IS_ERR(dra7xx->clk))
 		return dev_err_probe(dev, PTR_ERR(dra7xx->clk),
@@ -744,12 +738,6 @@ static int dra7xx_pcie_probe(struct platform_device *pdev)
 		phy[i] = devm_phy_get(dev, name);
 		if (IS_ERR(phy[i]))
 			return PTR_ERR(phy[i]);
-
-		link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
-		if (!link[i]) {
-			ret = -EINVAL;
-			goto err_link;
-		}
 	}
 
 	dra7xx->base = base;
@@ -851,10 +839,6 @@ static int dra7xx_pcie_probe(struct platform_device *pdev)
 	pm_runtime_disable(dev);
 	dra7xx_pcie_disable_phy(dra7xx);
 
-err_link:
-	while (--i >= 0)
-		device_link_del(link[i]);
-
 	return ret;
 }
 
diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index e9b012a5ea9a..8085c4f61403 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -130,7 +130,6 @@ 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;
@@ -1130,7 +1129,6 @@ 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;
@@ -1201,31 +1199,17 @@ 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;
 
@@ -1235,7 +1219,7 @@ 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 */
@@ -1250,7 +1234,7 @@ 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);
@@ -1337,25 +1321,18 @@ 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 = {
-- 
2.34.1