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Subject[PATCH v3 2/4] PCI: rockchip: Add support for pcie wake irq
Date
Add support for PCIE_WAKE pin in rockchip pcie driver.

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

Changes in v3:
Fix error handling

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

drivers/pci/host/pcie-rockchip.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index e9867bcff1ff..d52318458060 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -36,6 +36,7 @@
#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>

@@ -858,7 +859,6 @@ static void rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
chained_irq_exit(chip, desc);
}

-
/**
* rockchip_pcie_parse_dt - Parse Device Tree
* @rockchip: PCIe port information
@@ -1023,6 +1023,14 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
return err;
}

+ 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->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
if (IS_ERR(rockchip->vpcie3v3)) {
if (PTR_ERR(rockchip->vpcie3v3) == -EPROBE_DEFER)
@@ -1390,12 +1398,13 @@ 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);
@@ -1529,6 +1538,9 @@ 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;
}

@@ -1557,6 +1569,9 @@ 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

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