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Message-Id: <20250401-wake_irq_support-v1-2-d2e22f4a0efd@oss.qualcomm.com>
Date: Tue, 01 Apr 2025 10:12:44 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
cros-qcom-dts-watchers@...omium.org,
Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
Subject: [PATCH 2/2] PCI: Add support for PCIe wake interrupt
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 | 6 +++++
3 files changed, 72 insertions(+)
diff --git a/drivers/pci/of.c b/drivers/pci/of.c
index 7a806f5c0d201bc322d4a53d6ac47cab2cd28c55..abb0ba001edf604170aaa118f7fdc1a1709c171f 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
@@ -851,3 +853,61 @@ 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 01e51db8d285af54673db3ea526ceda073c94ec9..6e3d90db4b2505dd3885b482d4c5eafa033714e7 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -820,6 +820,9 @@ 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);
@@ -863,6 +866,9 @@ 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 02e73099bad0532466fa10f549cc3c5013aa1bbb..fe1da757e9eca0f82ae0d8043c0e4547ac9c30b6 100644
--- a/drivers/pci/pcie/portdrv.c
+++ b/drivers/pci/pcie/portdrv.c
@@ -695,6 +695,10 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
if (type == PCI_EXP_TYPE_RC_EC)
pcie_link_rcec(dev);
+ status = of_pci_setup_wake_irq(dev);
+ if (status)
+ return status;
+
status = pcie_port_device_register(dev);
if (status)
return status;
@@ -728,6 +732,8 @@ static void pcie_portdrv_remove(struct pci_dev *dev)
pm_runtime_dont_use_autosuspend(&dev->dev);
}
+ of_pci_teardown_wake_irq(dev);
+
pcie_port_device_remove(dev);
pci_disable_device(dev);
--
2.34.1
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