linux-kernel - [PATCH v3 02/10] PCI: dwc: Add dw_pcie_wake_irq

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Message-ID: <20250115092134.2904773-3-christian.bruel@foss.st.com>
Date: Wed, 15 Jan 2025 10:21:26 +0100
From: Christian Bruel <christian.bruel@...s.st.com>
To: <christian.bruel@...s.st.com>, <bhelgaas@...gle.com>,
        <lpieralisi@...nel.org>, <kw@...ux.com>,
        <manivannan.sadhasivam@...aro.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...s.st.com>,
        <jingoohan1@...il.com>, <p.zabel@...gutronix.de>,
        <johan+linaro@...nel.org>, <quic_schintav@...cinc.com>,
        <cassel@...nel.org>
CC: <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <fabrice.gasnier@...s.st.com>
Subject: [PATCH v3 02/10] PCI: dwc: Add dw_pcie_wake_irq_handler helper

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

Signed-off-by: Christian Bruel <christian.bruel@...s.st.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 15 +++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h      |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index bcbbe02f8f86..35cbb686d3f3 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"
@@ -991,3 +992,17 @@ 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 110cbac7dde1..434cb6a00f01 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -502,6 +502,8 @@ 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);
-- 
2.34.1