OrgACRN
/
acrn-kernel
mirror of https://github.com/projectacrn/acrn-kernel.git
1
0
Fork 0
Code Issues Releases Wiki Activity
acrn-kernel/include/soc/tegra/cpuidle.h

26 lines
795 B
C
Raw Normal View History

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.
*
* 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.
*/
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
soc/tegra: Stub out PCIe IRQ workaround on 64-bit ARM The PCIe host controller found on Tegra20 has a hardware bug that causes PCIe interrupts to get lost when LP2 is enabled. Stub out the workaround on 64-bit ARM because none of the more recent Tegra SoC generations seem to have this bug anymore. Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-29 22:11:32 +08:00
#if defined(CONFIG_ARM) && 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__ */