From 49229238ab47fa1852a89ee55d1e7fb251ee4eb0 Mon Sep 17 00:00:00 2001 From: Kishon Vijay Abraham I Date: Wed, 17 Oct 2018 13:11:04 +0530 Subject: [PATCH] PCI: keystone: Cleanup PHY handling Cleanup PHY handling by using devm_phy_optional_get() to get PHYs if the PHYs are optional, creating a device link between the PHY device and the controller device and disable PHY on error cases here. Signed-off-by: Kishon Vijay Abraham I Signed-off-by: Lorenzo Pieralisi --- drivers/pci/controller/dwc/pci-keystone.c | 122 +++++++++++++++++++--- 1 file changed, 106 insertions(+), 16 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c index e22328f89c84..5ae73c185c99 100644 --- a/drivers/pci/controller/dwc/pci-keystone.c +++ b/drivers/pci/controller/dwc/pci-keystone.c @@ -105,6 +105,9 @@ struct keystone_pcie { int num_msi_host_irqs; int msi_host_irqs[MAX_MSI_HOST_IRQS]; + int num_lanes; + struct phy **phy; + struct device_link **link; struct device_node *msi_intc_np; struct irq_domain *legacy_irq_domain; struct device_node *np; @@ -880,22 +883,57 @@ static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = { .link_up = ks_pcie_link_up, }; -static int __exit ks_pcie_remove(struct platform_device *pdev) +static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie) { - struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev); + int num_lanes = ks_pcie->num_lanes; - clk_disable_unprepare(ks_pcie->clk); + while (num_lanes--) { + phy_power_off(ks_pcie->phy[num_lanes]); + phy_exit(ks_pcie->phy[num_lanes]); + } +} + +static int ks_pcie_enable_phy(struct keystone_pcie *ks_pcie) +{ + int i; + int ret; + int num_lanes = ks_pcie->num_lanes; + + for (i = 0; i < num_lanes; i++) { + ret = phy_init(ks_pcie->phy[i]); + if (ret < 0) + goto err_phy; + + ret = phy_power_on(ks_pcie->phy[i]); + if (ret < 0) { + phy_exit(ks_pcie->phy[i]); + goto err_phy; + } + } return 0; + +err_phy: + while (--i >= 0) { + phy_power_off(ks_pcie->phy[i]); + phy_exit(ks_pcie->phy[i]); + } + + return ret; } static int __init ks_pcie_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; struct dw_pcie *pci; struct keystone_pcie *ks_pcie; - struct phy *phy; + struct device_link **link; + struct phy **phy; + u32 num_lanes; + char name[10]; int ret; + int i; ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL); if (!ks_pcie) @@ -908,29 +946,59 @@ static int __init ks_pcie_probe(struct platform_device *pdev) pci->dev = dev; pci->ops = &ks_pcie_dw_pcie_ops; - ks_pcie->pci = pci; + ret = of_property_read_u32(np, "num-lanes", &num_lanes); + if (ret) + num_lanes = 1; - /* initialize SerDes Phy if present */ - phy = devm_phy_get(dev, "pcie-phy"); - if (PTR_ERR_OR_ZERO(phy) == -EPROBE_DEFER) - return PTR_ERR(phy); + phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL); + if (!phy) + return -ENOMEM; - if (!IS_ERR_OR_NULL(phy)) { - ret = phy_init(phy); - if (ret < 0) - return ret; + link = devm_kzalloc(dev, sizeof(*link) * num_lanes, 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; + } + } + + ks_pcie->np = np; + ks_pcie->pci = pci; + ks_pcie->link = link; + ks_pcie->num_lanes = num_lanes; + ks_pcie->phy = phy; + + ret = ks_pcie_enable_phy(ks_pcie); + if (ret) { + dev_err(dev, "failed to enable phy\n"); + goto err_link; } - ks_pcie->np = dev->of_node; platform_set_drvdata(pdev, ks_pcie); ks_pcie->clk = devm_clk_get(dev, "pcie"); if (IS_ERR(ks_pcie->clk)) { dev_err(dev, "Failed to get pcie rc clock\n"); - return PTR_ERR(ks_pcie->clk); + ret = PTR_ERR(ks_pcie->clk); + goto err_phy; } + ret = clk_prepare_enable(ks_pcie->clk); if (ret) - return ret; + goto err_phy; ret = ks_pcie_add_pcie_port(ks_pcie, pdev); if (ret < 0) @@ -940,9 +1008,31 @@ static int __init ks_pcie_probe(struct platform_device *pdev) fail_clk: clk_disable_unprepare(ks_pcie->clk); +err_phy: + ks_pcie_disable_phy(ks_pcie); + +err_link: + while (--i >= 0 && link[i]) + device_link_del(link[i]); + return ret; } +static int __exit 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; + + clk_disable_unprepare(ks_pcie->clk); + ks_pcie_disable_phy(ks_pcie); + + while (num_lanes--) + device_link_del(link[num_lanes]); + + return 0; +} + static struct platform_driver ks_pcie_driver __refdata = { .probe = ks_pcie_probe, .remove = __exit_p(ks_pcie_remove),