[PATCH v6 1/3] PCI: rockchip: Add support for pcie wake irq

[Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>]

Add support for PCIE_WAKE pin in rockchip pcie driver.

Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
---

Changes in v6:
Fix device_init_wake error handling, and add some comments.

Changes in v5:
Rebase

Changes in v3:
Fix error handling

Changes in v2:
Use dev_pm_set_dedicated_wake_irq
        -- Suggested by Brian Norris <briannorris@xxxxxxxxxxxx>

 drivers/pci/host/pcie-rockchip.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index 9051c6c8fea4..268513b6c9c4 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -37,6 +37,7 @@
 #include <linux/pci_ids.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/reset.h>
 #include <linux/regmap.h>
 
@@ -995,6 +996,17 @@ static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
 		return err;
 	}
 
+	irq = platform_get_irq_byname(pdev, "wakeup");
+	if (irq >= 0) {
+		/* Must init wakeup before setting dedicated wakeup irq. */
+		device_init_wakeup(dev, true);
+		err = dev_pm_set_dedicated_wake_irq(dev, irq);
+		if (err) {
+			dev_err(dev, "failed to setup PCIe wakeup IRQ\n");
+			device_init_wakeup(dev, false);
+		}
+	}
+
 	return 0;
 }
 
@@ -1123,10 +1135,6 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 		return PTR_ERR(rockchip->clk_pcie_pm);
 	}
 
-	err = rockchip_pcie_setup_irq(rockchip);
-	if (err)
-		return err;
-
 	rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
 	if (IS_ERR(rockchip->vpcie12v)) {
 		if (PTR_ERR(rockchip->vpcie12v) == -EPROBE_DEFER)
@@ -1155,7 +1163,7 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 		dev_info(dev, "no vpcie0v9 regulator found\n");
 	}
 
-	return 0;
+	return rockchip_pcie_setup_irq(rockchip);
 }
 
 static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
@@ -1546,7 +1554,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 
 	err = rockchip_pcie_enable_clocks(rockchip);
 	if (err)
-		return err;
+		/* Cleanup rockchip_pcie_parse_dt() */
+		goto err_disable_wake;
 
 	err = rockchip_pcie_set_vpcie(rockchip);
 	if (err) {
@@ -1656,6 +1665,10 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 		regulator_disable(rockchip->vpcie0v9);
 err_set_vpcie:
 	rockchip_pcie_disable_clocks(rockchip);
+err_disable_wake:
+	/* It's harmless to disable wake even not enabled */
+	dev_pm_clear_wake_irq(dev);
+	device_init_wakeup(dev, false);
 	return err;
 }
 
@@ -1682,6 +1695,8 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
 	if (!IS_ERR(rockchip->vpcie0v9))
 		regulator_disable(rockchip->vpcie0v9);
 
+	dev_pm_clear_wake_irq(dev);
+	device_init_wakeup(dev, false);
 	return 0;
 }
 
-- 
2.11.0