linux-kernel - Re: [RFC PATCH v2 1/3] PCI: rockchip: Add support for pcie wake irq

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Date:   Fri, 18 Aug 2017 15:23:39 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Jeffy Chen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
        shawn.lin@...k-chips.com, briannorris@...omium.org,
        dianders@...omium.org, Heiko Stuebner <heiko@...ech.de>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH v2 1/3] PCI: rockchip: Add support for pcie wake irq

Hi Jeffy

On 2017/8/17 20:04, Jeffy Chen wrote:
> Add support for PCIE_WAKE pin in rockchip pcie driver.
> 
> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
> ---
> 
> Changes in v2:
> Use dev_pm_set_dedicated_wake_irq
>          -- Suggested by Brian Norris <briannorris@...omium.com>
> 
>   drivers/pci/host/pcie-rockchip.c | 13 ++++++++++++-
>   1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
> index 7bb9870f6d8c..c2b973c738fe 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>
>   
> @@ -853,7 +854,6 @@ 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
> @@ -1018,6 +1018,14 @@ 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)
> @@ -1524,6 +1532,9 @@ static int rockchip_pcie_remove(struct platform_device *pdev)
>   	struct device *dev = &pdev->dev;
>   	struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
>   
> +	dev_pm_clear_wake_irq(dev);
> +	device_init_wakeup(dev, false);
> +

Looks good overall but I think we need this on the
error handling path of rockchip_pcie_probe as well?

>   	pci_stop_root_bus(rockchip->root_bus);
>   	pci_remove_root_bus(rockchip->root_bus);
>   	pci_unmap_iospace(rockchip->io);
>