[PATCH v4 2/4] PCI: rockchip: Add support for pcie wake irq

[Jeffy Chen]

Add support for PCIE_WAKE pin in rockchip pcie driver.

Signed-off-by: Jeffy Chen <jeffy.c...@rock-chips.com>
---

Changes in v4: None
Changes in v3:
Fix error handling

Changes in v2:
Use dev_pm_set_dedicated_wake_irq
        -- Suggested by Brian Norris <briannor...@chromium.com>

 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