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b4f173752a
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>
31 lines
995 B
C
31 lines
995 B
C
/*
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* Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __MACH_TEGRA_CPUIDLE_H
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#define __MACH_TEGRA_CPUIDLE_H
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#ifdef CONFIG_CPU_IDLE
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int tegra20_cpuidle_init(void);
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void tegra20_cpuidle_pcie_irqs_in_use(void);
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int tegra30_cpuidle_init(void);
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int tegra114_cpuidle_init(void);
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void tegra_cpuidle_init(void);
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#else
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static inline void tegra_cpuidle_init(void) {}
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#endif
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#endif
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