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Message-ID: <a8e58612-c6f5-8b61-af35-2c2897ad7827@oss.qualcomm.com>
Date: Fri, 9 May 2025 13:29:21 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-arm-msm@...r.kernel.org, Konrad Dybcio <konradybcio@...nel.org>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org, quic_vbadigan@...cinc.com,
quic_mrana@...cinc.com, cros-qcom-dts-watchers@...omium.org,
Conor Dooley <conor+dt@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Bjorn Andersson <andersson@...nel.org>
Subject: Re: [PATCH v2 2/2] PCI: Add support for PCIe wake interrupt
A Gentle remainder.
- Krishna Chaitanya.
On 4/19/2025 11:13 AM, Krishna Chaitanya Chundru wrote:
> PCIe wake interrupt is needed for bringing back PCIe device state
> from D3cold to D0.
>
> Implement new functions, of_pci_setup_wake_irq() and
> of_pci_teardown_wake_irq(), to manage wake interrupts for PCI devices
> using the Device Tree.
>
> From the port bus driver call these functions to enable wake support
> for bridges.
>
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---
> drivers/pci/of.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++
> drivers/pci/pci.h | 6 +++++
> drivers/pci/pcie/portdrv.c | 12 +++++++++-
> 3 files changed, 77 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/of.c b/drivers/pci/of.c
> index ab7a8252bf4137a17971c3eb8ab70ce78ca70969..13623797c88a03dfb9d9079518d87a5e1e68df38 100644
> --- a/drivers/pci/of.c
> +++ b/drivers/pci/of.c
> @@ -7,6 +7,7 @@
> #define pr_fmt(fmt) "PCI: OF: " fmt
>
> #include <linux/cleanup.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/irqdomain.h>
> #include <linux/kernel.h>
> #include <linux/pci.h>
> @@ -15,6 +16,7 @@
> #include <linux/of_address.h>
> #include <linux/of_pci.h>
> #include <linux/platform_device.h>
> +#include <linux/pm_wakeirq.h>
> #include "pci.h"
>
> #ifdef CONFIG_PCI
> @@ -966,3 +968,61 @@ u32 of_pci_get_slot_power_limit(struct device_node *node,
> return slot_power_limit_mw;
> }
> EXPORT_SYMBOL_GPL(of_pci_get_slot_power_limit);
> +
> +/**
> + * of_pci_setup_wake_irq - Set up wake interrupt for PCI device
> + * @pdev: The PCI device structure
> + *
> + * This function sets up the wake interrupt for a PCI device by getting the
> + * corresponding GPIO pin from the device tree, and configuring it as a
> + * dedicated wake interrupt.
> + *
> + * Return: 0 if the wake gpio is not available or successfully parsed else
> + * errno otherwise.
> + */
> +int of_pci_setup_wake_irq(struct pci_dev *pdev)
> +{
> + struct gpio_desc *wake;
> + struct device_node *dn;
> + int ret, wake_irq;
> +
> + dn = pci_device_to_OF_node(pdev);
> + if (!dn)
> + return 0;
> +
> + wake = devm_fwnode_gpiod_get(&pdev->dev, of_fwnode_handle(dn),
> + "wake", GPIOD_IN, NULL);
> + if (IS_ERR(wake)) {
> + dev_warn(&pdev->dev, "Cannot get wake GPIO\n");
> + return 0;
> + }
> +
> + wake_irq = gpiod_to_irq(wake);
> + device_init_wakeup(&pdev->dev, true);
> +
> + ret = dev_pm_set_dedicated_wake_irq(&pdev->dev, wake_irq);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to set wake IRQ: %d\n", ret);
> + device_init_wakeup(&pdev->dev, false);
> + return ret;
> + }
> + irq_set_irq_type(wake_irq, IRQ_TYPE_EDGE_FALLING);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(of_pci_setup_wake_irq);
> +
> +/**
> + * of_pci_teardown_wake_irq - Teardown wake interrupt setup for PCI device
> + *
> + * @pdev: The PCI device structure
> + *
> + * This function tears down the wake interrupt setup for a PCI device,
> + * clearing the dedicated wake interrupt and disabling device wake-up.
> + */
> +void of_pci_teardown_wake_irq(struct pci_dev *pdev)
> +{
> + dev_pm_clear_wake_irq(&pdev->dev);
> + device_init_wakeup(&pdev->dev, false);
> +}
> +EXPORT_SYMBOL_GPL(of_pci_teardown_wake_irq);
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index b81e99cd4b62a3022c8b07a09f212f6888674487..b2f65289f4156fa1851c2d2f20c4ca948f36258f 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -888,6 +888,9 @@ void pci_release_of_node(struct pci_dev *dev);
> void pci_set_bus_of_node(struct pci_bus *bus);
> void pci_release_bus_of_node(struct pci_bus *bus);
>
> +int of_pci_setup_wake_irq(struct pci_dev *pdev);
> +void of_pci_teardown_wake_irq(struct pci_dev *pdev);
> +
> int devm_of_pci_bridge_init(struct device *dev, struct pci_host_bridge *bridge);
> bool of_pci_supply_present(struct device_node *np);
>
> @@ -931,6 +934,9 @@ static inline int devm_of_pci_bridge_init(struct device *dev, struct pci_host_br
> return 0;
> }
>
> +static int of_pci_setup_wake_irq(struct pci_dev *pdev) { return 0; }
> +static void of_pci_teardown_wake_irq(struct pci_dev *pdev) { }
> +
> static inline bool of_pci_supply_present(struct device_node *np)
> {
> return false;
> diff --git a/drivers/pci/pcie/portdrv.c b/drivers/pci/pcie/portdrv.c
> index e8318fd5f6ed537a1b236a3a0f054161d5710abd..33220ecf821c348d49782855eb5aa3f2fe5c335e 100644
> --- a/drivers/pci/pcie/portdrv.c
> +++ b/drivers/pci/pcie/portdrv.c
> @@ -694,12 +694,18 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
> (type != PCI_EXP_TYPE_RC_EC)))
> return -ENODEV;
>
> + status = of_pci_setup_wake_irq(dev);
> + if (status)
> + return status;
> +
> if (type == PCI_EXP_TYPE_RC_EC)
> pcie_link_rcec(dev);
>
> status = pcie_port_device_register(dev);
> - if (status)
> + if (status) {
> + of_pci_teardown_wake_irq(dev);
> return status;
> + }
>
> pci_save_state(dev);
>
> @@ -732,6 +738,8 @@ static void pcie_portdrv_remove(struct pci_dev *dev)
>
> pcie_port_device_remove(dev);
>
> + of_pci_teardown_wake_irq(dev);
> +
> pci_disable_device(dev);
> }
>
> @@ -744,6 +752,8 @@ static void pcie_portdrv_shutdown(struct pci_dev *dev)
> }
>
> pcie_port_device_remove(dev);
> +
> + of_pci_teardown_wake_irq(dev);
> }
>
> static pci_ers_result_t pcie_portdrv_error_detected(struct pci_dev *dev,
>
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