1 files changed, 12 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/cpuidle-tegra20.c b/arch/arm/mach-tegra/cpuidle-tegra20.c
index 706aa4215c36..b82dcaee2ef4 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra20.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
@@ -211,6 +211,18 @@ static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
 }
 #endif
 
+/*
+ * Tegra20 HW appears to have a bug such that PCIe device interrupts, whether
+ * they are legacy IRQs or MSI, are lost when LP2 is enabled. To work around
+ * this, simply disable LP2 if the PCI driver and DT node are both enabled.
+ */
+void tegra20_cpuidle_pcie_irqs_in_use(void)
+{
+        pr_info_once(
+                "Disabling cpuidle LP2 state, since PCIe IRQs are in use\n");
+        tegra_idle_driver.states[1].disabled = true;
+}
+
 int __init tegra20_cpuidle_init(void)
 {
         return cpuidle_register(&tegra_idle_driver, cpu_possible_mask);