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acrn-kernel/include/soc/tegra/cpuidle.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-29 22:18:02 +08:00
/* SPDX-License-Identifier: GPL-2.0-only */
ARM: tegra: disable LP2 cpuidle state if PCIe is enabled 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 any PCIe devices with interrupts are present. Detect this via the IRQ domain map operation. This is slightly over-conservative; if a device with an interrupt is present but the driver does not actually use them, LP2 will still be disabled. However, this is a reasonable trade-off which enables a simpler workaround. Signed-off-by: Stephen Warren <swarren@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com>
2013-05-07 04:19:19 +08:00
/*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*/
ARM: tegra: Move includes to include/soc/tegra In order to not clutter the include/linux directory with SoC specific headers, move the Tegra-specific headers out into a separate directory. Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 19:17:24 +08:00
#ifndef __SOC_TEGRA_CPUIDLE_H__
#define __SOC_TEGRA_CPUIDLE_H__
ARM: tegra: disable LP2 cpuidle state if PCIe is enabled 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 any PCIe devices with interrupts are present. Detect this via the IRQ domain map operation. This is slightly over-conservative; if a device with an interrupt is present but the driver does not actually use them, LP2 will still be disabled. However, this is a reasonable trade-off which enables a simpler workaround. Signed-off-by: Stephen Warren <swarren@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com>
2013-05-07 04:19:19 +08:00
ARM: tegra: fix compile-testing PCI host driver The tegra_cpuidle_pcie_irqs_in_use() function is stubbed out for non-ARM builds, but now we can compile-test the Tegra pci driver on non-Tegra ARM platforms as well, which results in a new link error: drivers/pci/host/pci-tegra.o: In function `tegra_pcie_map_irq': pci-tegra.c:(.text+0x288): undefined reference to `tegra_cpuidle_pcie_irqs_in_use' drivers/pci/host/pci-tegra.o: In function `tegra_msi_map': pci-tegra.c:(.text+0xba0): undefined reference to `tegra_cpuidle_pcie_irqs_in_use' This adapts the #ifdef statement to match the exact condition under which the function can be called. Fixes: 51bc085d6454 ("PCI: Improve host drivers compile test coverage") Cc: Rob Herring <robh@kernel.org> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Olof Johansson <olof@lixom.net>
2018-05-28 23:55:29 +08:00
#if defined(CONFIG_ARM) && defined(CONFIG_ARCH_TEGRA) && defined(CONFIG_CPU_IDLE)
ARM: tegra: disable LP2 cpuidle state if PCIe is enabled 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 any PCIe devices with interrupts are present. Detect this via the IRQ domain map operation. This is slightly over-conservative; if a device with an interrupt is present but the driver does not actually use them, LP2 will still be disabled. However, this is a reasonable trade-off which enables a simpler workaround. Signed-off-by: Stephen Warren <swarren@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com>
2013-05-07 04:19:19 +08:00
void tegra_cpuidle_pcie_irqs_in_use(void);
tegra-cpuidle: provide stub when !CONFIG_CPU_IDLE While poking at something using the for-3.12/* trees, I hit the following compile error: drivers/built-in.o: In function `tegra_pcie_map_irq': /builddir/build/BUILD/kernel-3.10.fc20/linux-3.11.0-0.rc6.git4.1.fc20.armv7hl/drivers/pci/host/pci-tegra.c:640: undefined reference to `tegra_cpuidle_pcie_irqs_in_use' drivers/built-in.o: In function `tegra_msi_map': /builddir/build/BUILD/kernel-3.10.fc20/linux-3.11.0-0.rc6.git4.1.fc20.armv7hl/drivers/pci/host/pci-tegra.c:1227: undefined reference to `tegra_cpuidle_pcie_irqs_in_use' make: *** [vmlinux] Error 1 Since our .config had CONFIG_CPU_IDLE off. We should probably provide an empty function to handle this to avoid cluttering up pci-tegra.c with conditionals. Signed-off-by: Kyle McMartin <kyle@redhat.com> Reviewed-by: Thierry Reding <treding@nvidia.com> [swarren, removed unnecessary return statement] Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Olof Johansson <olof@lixom.net>
2013-08-28 02:52:34 +08:00
#else
static inline void tegra_cpuidle_pcie_irqs_in_use(void)
{
}
#endif
ARM: tegra: disable LP2 cpuidle state if PCIe is enabled 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 any PCIe devices with interrupts are present. Detect this via the IRQ domain map operation. This is slightly over-conservative; if a device with an interrupt is present but the driver does not actually use them, LP2 will still be disabled. However, this is a reasonable trade-off which enables a simpler workaround. Signed-off-by: Stephen Warren <swarren@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Acked-by: Thierry Reding <treding@nvidia.com>
2013-05-07 04:19:19 +08:00
ARM: tegra: Move includes to include/soc/tegra In order to not clutter the include/linux directory with SoC specific headers, move the Tegra-specific headers out into a separate directory. Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-07-17 19:17:24 +08:00
#endif /* __SOC_TEGRA_CPUIDLE_H__ */