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Subject[PATCH 11/19] PCI: keystone: Cleanup PHY handling
Date
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.
Also invoke phy_reset() as part of initializing PHY.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
drivers/pci/controller/dwc/pci-keystone.c | 126 +++++++++++++++++++---
1 file changed, 110 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index e22328f89c84..bf37609ad75b 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 +883,61 @@ 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_reset(ks_pcie->phy[i]);
+ if (ret < 0)
+ goto err_phy;
+
+ 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 +950,59 @@ 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 +1012,31 @@ 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),
--
2.17.1
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