[v4,02/10] PCI: dwc: Add dw_pcie_wake_irq_handler helper

Commit Message

Christian Bruel Jan. 28, 2025, 12:07 p.m. UTC

Introduce dw_pcie_wake_irq_handler function to support host wakeup from
the WAKE# irq.

Signed-off-by: Christian Bruel <[e-mail]>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 15 +++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h      |  2 ++
 2 files changed, 17 insertions(+)

Patch

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index ef4799effa03..5a67bee5bf3c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -16,6 +16,7 @@ 
 #include <linux/of_pci.h>
 #include <linux/pci_regs.h>
 #include <linux/platform_device.h>
+#include <linux/suspend.h>
 
 #include "../../pci.h"
 #include "pcie-designware.h"
@@ -1054,3 +1055,17 @@  int dw_pcie_resume_noirq(struct dw_pcie *pci)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(dw_pcie_resume_noirq);
+
+irqreturn_t dw_pcie_wake_irq_handler(int irq, void *arg)
+{
+	struct device *dev = arg;
+
+	dev_dbg(dev, "host wakeup by EP");
+
+	/* Notify PM core we are wakeup source */
+	pm_wakeup_event(dev, 0);
+	pm_system_wakeup();
+
+	return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_GPL(dw_pcie_wake_irq_handler);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index f8bf9c89a152..f54cf7b01cbd 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -511,6 +511,8 @@  void dw_pcie_edma_remove(struct dw_pcie *pci);
 int dw_pcie_suspend_noirq(struct dw_pcie *pci);
 int dw_pcie_resume_noirq(struct dw_pcie *pci);
 
+irqreturn_t dw_pcie_wake_irq_handler(int irq, void *arg);
+
 static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
 {
 	dw_pcie_write_dbi(pci, reg, 0x4, val);