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PCI: keystone: Cleanup PHY handling

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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 <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Kishon Vijay Abraham I 2018-10-17 13:11:04 +05:30 committed by Lorenzo Pieralisi
parent b51a625b78
commit 49229238ab
1 changed files with 106 additions and 16 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

122
drivers/pci/controller/dwc/pci-keystone.c
View file

@ -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),