hi shawn,
On 08/16/2017 05:00 PM, Shawn Lin wrote:
> Hi Jeffy,
>
> On 2017/8/16 15:52, Jeffy Chen wrote:
>> Add support for PCIE_WAKE pin in rockchip pcie driver.
>>
>> Signed-off-by: Jeffy Chen <jeffy.chen at rock-chips.com>
>> ---
>>
>> drivers/pci/host/pcie-rockchip.c | 58
>> ++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 58 insertions(+)
>>
>> diff --git a/drivers/pci/host/pcie-rockchip.c
>> b/drivers/pci/host/pcie-rockchip.c
>> index 7bb9870f6d8c..f969a6d3cd85 100644
>> --- a/drivers/pci/host/pcie-rockchip.c
>> +++ b/drivers/pci/host/pcie-rockchip.c
>> @@ -38,6 +38,7 @@
>> #include <linux/platform_device.h>
>> #include <linux/reset.h>
>> #include <linux/regmap.h>
>> +#include <linux/suspend.h>
>> /*
>> * The upper 16 bits of PCIE_CLIENT_CONFIG are a write mask for the
>> lower 16
>> @@ -226,6 +227,8 @@ struct rockchip_pcie {
>> struct regulator *vpcie1v8; /* 1.8V power supply */
>> struct regulator *vpcie0v9; /* 0.9V power supply */
>> struct gpio_desc *ep_gpio;
>> + int wake_irq;
>> + bool wake_by_pcie;
>> u32 lanes;
>> u8 root_bus_nr;
>> int link_gen;
>> @@ -853,6 +856,20 @@ static void
>> rockchip_pcie_legacy_int_handler(struct irq_desc *desc)
>> chained_irq_exit(chip, desc);
>> }
>> +static irqreturn_t rockchip_pcie_wake_irq_handler(int irq, void *arg)
>> +{
>> + struct rockchip_pcie *rockchip = arg;
>> +
>> + rockchip->wake_by_pcie = true;
>> +
>> + disable_irq_nosync(rockchip->wake_irq);
>> + disable_irq_wake(rockchip->wake_irq);
>> +
>> + pm_wakeup_event(rockchip->dev, 0);
>> + pm_system_wakeup();
>> +
>> + return IRQ_HANDLED;
>> +}
>> /**
>> * rockchip_pcie_parse_dt - Parse Device Tree
>> @@ -868,6 +885,7 @@ static int rockchip_pcie_parse_dt(struct
>> rockchip_pcie *rockchip)
>> struct resource *regs;
>> int irq;
>> int err;
>> + bool wakeup = 0;
>> regs = platform_get_resource_byname(pdev,
>> IORESOURCE_MEM,
>> @@ -1018,6 +1036,21 @@ static int rockchip_pcie_parse_dt(struct
>> rockchip_pcie *rockchip)
>> return err;
>> }
>> + rockchip->wake_irq = platform_get_irq_byname(pdev, "wake");
>> + if (rockchip->wake_irq >= 0) {
>> + err = devm_request_irq(dev, rockchip->wake_irq,
>> + rockchip_pcie_wake_irq_handler,
>> + 0, "pcie-wake", rockchip);
>> + if (err) {
>> + dev_err(dev, "failed to request PCIe wake IRQ\n");
>> + return err;
>
> This is optional, so I'm not sure if we should prevent the driver to
> probe?
it would only break probe when there's a wake irq, but failed to enable
it. but the wake irq itself is optional
>
>> + }
>> +
>> + disable_irq(rockchip->wake_irq);
>> + wakeup = device_property_read_bool(dev, "wakeup-source");
>
> The purpose we add this, is for ep to wakeup the system, so why not
> always treate it as a wakeup source.
it's an extra option to disable wake by wakeup-source property
>
>> + }
>> + device_init_wakeup(dev, wakeup);
>> +
>> rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
>> if (IS_ERR(rockchip->vpcie3v3)) {
>> if (PTR_ERR(rockchip->vpcie3v3) == -EPROBE_DEFER)
>> @@ -1270,6 +1303,30 @@ static int rockchip_pcie_wait_l2(struct
>> rockchip_pcie *rockchip)
>> return 0;
>> }
>> +static int __maybe_unused rockchip_pcie_suspend(struct device *dev)
>> +{
>> + struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
>> +
>> + rockchip->wake_by_pcie = false;
>> +
>> + if (device_may_wakeup(dev)) {
>> + enable_irq_wake(rockchip->wake_irq);
>> + enable_irq(rockchip->wake_irq);
>> + }
>> + return 0;
>> +}
>> +
>> +static int __maybe_unused rockchip_pcie_resume(struct device *dev)
>> +{
>> + struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
>> +
>> + if (device_may_wakeup(dev) && !rockchip->wake_by_pcie) {
>
> I don't get this that why we need to check wake_by_pcie here?
>
it's to avoid double disable when it got a irq before resume
>> + disable_irq(rockchip->wake_irq);
>> + disable_irq_wake(rockchip->wake_irq);
>> + }
>> + return 0;
>> +}
>> +
>> static int __maybe_unused rockchip_pcie_suspend_noirq(struct device
>> *dev)
>> {
>> struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
>> @@ -1548,6 +1605,7 @@ static int rockchip_pcie_remove(struct
>> platform_device *pdev)
>> }
>> static const struct dev_pm_ops rockchip_pcie_pm_ops = {
>> + SET_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend, rockchip_pcie_resume)
>> SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rockchip_pcie_suspend_noirq,
>> rockchip_pcie_resume_noirq)
>> };
>>
>
>
>
