irqchip: gic-v3: Implement CPU PM notifier
When a CPU enters a low power state, the contents of the GICv3/4 system registers are lost. They need to be saved and restored if required. For now, since most of the GICv3 register are set some initial values and not modified at runtime, it is better to re-initialise rather than saving and restoring them. It may need to be saved and restored in future if required. This patch adds a notifier to disable the redistributor(if allowed) and Group1 interrupts when powering down the processor and to re-initialise the system registers on wakeup. Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Link: https://lkml.kernel.org/r/1409065415-20176-3-git-send-email-sudeep.holla@arm.comSigned-off-by: Jason Cooper <jason@lakedaemon.net>
Showing