ARM: tegra: disable LP2 cpuidle state if PCIe is enabled (b4f17375) · Commits · 戴 / test

arch/arm/mach-tegra/cpuidle-tegra20.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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);

+10 −0

Original line number	Diff line number	Diff line
		@@ -44,3 +44,13 @@ void __init tegra_cpuidle_init(void)
		break;
		}
		}

		void tegra_cpuidle_pcie_irqs_in_use(void)
		{
		switch (tegra_chip_id) {
		case TEGRA20:
		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
		tegra20_cpuidle_pcie_irqs_in_use();
		break;
		}
		}

+1 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@

		#ifdef CONFIG_CPU_IDLE
		int tegra20_cpuidle_init(void);
		void tegra20_cpuidle_pcie_irqs_in_use(void);
		int tegra30_cpuidle_init(void);
		int tegra114_cpuidle_init(void);
		void tegra_cpuidle_init(void);

+5 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,7 @@
		#include <linux/platform_device.h>
		#include <linux/sizes.h>
		#include <linux/slab.h>
		#include <linux/tegra-cpuidle.h>
		#include <linux/tegra-powergate.h>
		#include <linux/vmalloc.h>
		#include <linux/regulator/consumer.h>
		@@ -636,6 +637,8 @@ static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin)
		{
		struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata);

		tegra_cpuidle_pcie_irqs_in_use();

		return pcie->irq;
		}

		@@ -1221,6 +1224,8 @@ static int tegra_msi_map(struct irq_domain *domain, unsigned int irq,
		irq_set_chip_data(irq, domain->host_data);
		set_irq_flags(irq, IRQF_VALID);

		tegra_cpuidle_pcie_irqs_in_use();

		return 0;
		}

0 → 100644

+19 −0

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		/*
		* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms and conditions of the GNU General Public License,
		* version 2, as published by the Free Software Foundation.
		*
		* This program is distributed in the hope it will be useful, but WITHOUT
		* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
		* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
		* more details.
		*/

		#ifndef __LINUX_TEGRA_CPUIDLE_H__
		#define __LINUX_TEGRA_CPUIDLE_H__

		void tegra_cpuidle_pcie_irqs_in_use(void);

		#endif