linux-kernel - Re: [PATCH v6 1/3] PCI: rockchip: Add support for pcie wake irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171016200350.GH25517@bhelgaas-glaptop.roam.corp.google.com>
Date:   Mon, 16 Oct 2017 15:03:50 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
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: [PATCH v6 1/3] PCI: rockchip: Add support for pcie wake irq

On Sat, Oct 14, 2017 at 03:50:56AM +0800, 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 v6:
> Fix device_init_wake error handling, and add some comments.
> 
> Changes in v5:
> Rebase
> 
> Changes in v3:
> Fix error handling
> 
> Changes in v2:
> Use dev_pm_set_dedicated_wake_irq
>         -- Suggested by Brian Norris <briannorris@...omium.com>
> 
>  drivers/pci/host/pcie-rockchip.c | 27 +++++++++++++++++++++------
>  1 file changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
> index 9051c6c8fea4..268513b6c9c4 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>
>  
> @@ -995,6 +996,17 @@ static int rockchip_pcie_setup_irq(struct rockchip_pcie *rockchip)
>  		return err;
>  	}
>  
> +	irq = platform_get_irq_byname(pdev, "wakeup");
> +	if (irq >= 0) {
> +		/* Must init wakeup before setting dedicated wakeup irq. */
> +		device_init_wakeup(dev, true);
> +		err = dev_pm_set_dedicated_wake_irq(dev, irq);
> +		if (err) {
> +			dev_err(dev, "failed to setup PCIe wakeup IRQ\n");
> +			device_init_wakeup(dev, false);
> +		}
> +	}

There's nothing Rockchip-specific here, so I'm hoping you can explore
putting this support in the PCI core, so any system that describes the
WAKE# connection in the DT can benefit.

>  	return 0;
>  }
>  
> @@ -1123,10 +1135,6 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
>  		return PTR_ERR(rockchip->clk_pcie_pm);
>  	}
>  
> -	err = rockchip_pcie_setup_irq(rockchip);
> -	if (err)
> -		return err;
> -
>  	rockchip->vpcie12v = devm_regulator_get_optional(dev, "vpcie12v");
>  	if (IS_ERR(rockchip->vpcie12v)) {
>  		if (PTR_ERR(rockchip->vpcie12v) == -EPROBE_DEFER)
> @@ -1155,7 +1163,7 @@ static int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
>  		dev_info(dev, "no vpcie0v9 regulator found\n");
>  	}
>  
> -	return 0;
> +	return rockchip_pcie_setup_irq(rockchip);
>  }
>  
>  static int rockchip_pcie_set_vpcie(struct rockchip_pcie *rockchip)
> @@ -1546,7 +1554,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  
>  	err = rockchip_pcie_enable_clocks(rockchip);
>  	if (err)
> -		return err;
> +		/* Cleanup rockchip_pcie_parse_dt() */
> +		goto err_disable_wake;
>  
>  	err = rockchip_pcie_set_vpcie(rockchip);
>  	if (err) {
> @@ -1656,6 +1665,10 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  		regulator_disable(rockchip->vpcie0v9);
>  err_set_vpcie:
>  	rockchip_pcie_disable_clocks(rockchip);
> +err_disable_wake:
> +	/* It's harmless to disable wake even not enabled */
> +	dev_pm_clear_wake_irq(dev);
> +	device_init_wakeup(dev, false);
>  	return err;
>  }
>  
> @@ -1682,6 +1695,8 @@ 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
> 
>