mirror of https://gitee.com/openkylin/linux.git
7e8b15dbc3
There is a difference between GICv1 and v2 when CPU in power management mode (aka CPU power down on Tegra). For GICv1, IRQ/FIQ interrupt lines going to CPU are same lines which are also used for wake-interrupt. Therefore, we cannot disable the GIC CPU interface if we need to use same interrupts for CPU wake purpose. This creates a race condition for CPU power off entry. Also, in GICv1, disabling GICv1 CPU interface puts GICv1 into bypass mode such that incoming legacy IRQ/FIQ are sent to CPU, which means disabling GIC CPU interface doesn't really disable IRQ/FIQ to CPU. GICv2 provides a wake IRQ/FIQ (for wake-event purpose), which are not disabled by GIC CPU interface. This is done by adding a bypass override capability when the interrupts are disabled at the CPU interface. To support this, there are four bits about IRQ/FIQ BypassDisable in CPU interface Control Register. When the IRQ/FIQ not being driver by the CPU interface, each interrupt output signal can be deasserted rather than being driven by the legacy interrupt input. So the wake-event can be used as wakeup signals to SoC (system power controller). To prevent race conditions and ensure proper interrupt routing on Cortex-A15 CPUs when they are power-gated, add a CPU PM notifier call-back to reprogram the GIC CPU interface on PM entry. The GIC CPU interface will be reset back to its normal state by the common GIC CPU PM exit callback when the CPU wakes up. Based on the work by: Scott Williams <scwilliams@nvidia.com> Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com> |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| apbio.c | ||
| apbio.h | ||
| board-harmony-pcie.c | ||
| board-paz00.c | ||
| board-paz00.h | ||
| board.h | ||
| common.c | ||
| common.h | ||
| cpuidle-tegra20.c | ||
| cpuidle-tegra30.c | ||
| cpuidle-tegra114.c | ||
| cpuidle.c | ||
| cpuidle.h | ||
| flowctrl.c | ||
| flowctrl.h | ||
| fuse.c | ||
| fuse.h | ||
| gpio-names.h | ||
| headsmp.S | ||
| hotplug.c | ||
| io.c | ||
| iomap.h | ||
| irammap.h | ||
| irq.c | ||
| irq.h | ||
| pcie.c | ||
| platsmp.c | ||
| pm.c | ||
| pm.h | ||
| pmc.c | ||
| pmc.h | ||
| powergate.c | ||
| reset-handler.S | ||
| reset.c | ||
| reset.h | ||
| sleep-tegra20.S | ||
| sleep-tegra30.S | ||
| sleep.S | ||
| sleep.h | ||
| tegra.c | ||
| tegra2_emc.c | ||
| tegra2_emc.h | ||
| tegra20_speedo.c | ||
| tegra30_speedo.c | ||
| tegra114_speedo.c | ||