[PATCH v4 2/4] 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 v4: None
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 | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index 5d85ec2e2fb0..a0f7267984da 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>
 
@@ -1111,6 +1112,15 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
 		return err;
 	}
 
+	/* Must init wakeup before setting dedicated wake irq. */
+	device_init_wakeup(dev, true);
+	irq = platform_get_irq_byname(pdev, "wake");
+	if (irq >= 0) {
+		err = dev_pm_set_dedicated_wake_irq(dev, irq);
+		if (err)
+			dev_err(dev, "failed to setup PCIe wake IRQ\n");
+	}
+
 	rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
 	if (IS_ERR(rockchip->vpcie12v)) {
 		if (PTR_ERR(rockchip->vpcie12v) == -EPROBE_DEFER)
@@ -1493,12 +1503,13 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 
 	err = rockchip_pcie_parse_dt(rockchip);
 	if (err)
-		return err;
+		/* It's safe to disable wake even not enabled */
+		goto err_disable_wake;
 
 	err = clk_prepare_enable(rockchip->aclk_pcie);
 	if (err) {
 		dev_err(dev, "unable to enable aclk_pcie clock\n");
-		return err;
+		goto err_disable_wake;
 	}
 
 	err = clk_prepare_enable(rockchip->aclk_perf_pcie);
@@ -1633,6 +1644,9 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
 	clk_disable_unprepare(rockchip->aclk_perf_pcie);
 err_disable_aclk_pcie:
 	clk_disable_unprepare(rockchip->aclk_pcie);
+err_disable_wake:
+	dev_pm_clear_wake_irq(dev);
+	device_init_wakeup(dev, false);
 	return err;
 }
 
@@ -1662,6 +1676,9 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
 	if (!IS_ERR(rockchip->vpcie12v))
 		regulator_disable(rockchip->vpcie12v);
 
+	dev_pm_clear_wake_irq(dev);
+	device_init_wakeup(dev, false);
+
 	return 0;
 }
 
-- 
2.11.0