commit 459a27dc170d189b3361e6f0db2239fcfdf07cdf
author Niranjana Vishwanathapura <nvishwan@codeaurora.org> Fri Jul 20 12:23:55 2012 -0600
committer Niranjana Vishwanathapura <nvishwan@codeaurora.org> Tue Jul 31 17:53:25 2012 -0600
tree 0c0ed924401ac572666aa441e6d0020526261b7f
parent acc76a62e48eb93617026d2a968b1639721e5e28

msm: pcie: mpq8064: Add system wakeup support to PCIe controller

Update the PCIe controller to register for wakeup interrupt enabling
the PCIe devices to wakeup the system if suspended.

Change-Id: I49960702c0abc1e1406dff622843456e0f0547c6
Signed-off-by: Niranjana Vishwanathapura <nvishwan@codeaurora.org>

arch/arm/mach-msm/pcie_irq.c

diff --git a/arch/arm/mach-msm/pcie_irq.c b/arch/arm/mach-msm/pcie_irq.c
index d915561..5a44a17 100644
--- a/arch/arm/mach-msm/pcie_irq.c
+++ b/arch/arm/mach-msm/pcie_irq.c
@@ -39,7 +39,13 @@
 
 static DECLARE_BITMAP(msi_irq_in_use, NR_PCIE_MSI_IRQS);
 
-irqreturn_t handle_msi_irq(int irq, void *data)
+static irqreturn_t handle_wake_irq(int irq, void *data)
+{
+	PCIE_DBG("\n");
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t handle_msi_irq(int irq, void *data)
 {
 	int i, j;
 	unsigned long val;
@@ -87,15 +93,32 @@
 	/* register handler for physical MSI interrupt line */
 	rc = request_irq(PCIE20_INT_MSI, handle_msi_irq, IRQF_TRIGGER_RISING,
 			 "msm_pcie_msi", dev);
-	if (rc)
+	if (rc) {
 		pr_err("Unable to allocate msi interrupt\n");
+		goto out;
+	}
 
+	/* register handler for PCIE_WAKE_N interrupt line */
+	rc = request_irq(dev->wake_n, handle_wake_irq, IRQF_TRIGGER_FALLING,
+			 "msm_pcie_wake", dev);
+	if (rc) {
+		pr_err("Unable to allocate wake interrupt\n");
+		free_irq(PCIE20_INT_MSI, dev);
+		goto out;
+	}
+
+	enable_irq_wake(dev->wake_n);
+
+	/* PCIE_WAKE_N should be enabled only during system suspend */
+	disable_irq(dev->wake_n);
+out:
 	return rc;
 }
 
 void __exit msm_pcie_irq_deinit(struct msm_pcie_dev_t *dev)
 {
 	free_irq(PCIE20_INT_MSI, dev);
+	free_irq(dev->wake_n, dev);
 }
 
 void msm_pcie_destroy_irq(unsigned int irq)