linux/arch/arm64
Daniel Thompson 4efc851c36 irqchip/exiu: Fix acknowledgment of edge triggered interrupts
Currently the EXIU uses the fasteoi interrupt flow that is configured by
it's parent (irq-gic-v3.c). With this flow the only chance to clear the
interrupt request happens during .irq_eoi() and (obviously) this happens
after the interrupt handler has run. EXIU requires edge triggered
interrupts to be acked prior to interrupt handling. Without this we
risk incorrect interrupt dismissal when a new interrupt is delivered
after the handler reads and acknowledges the peripheral but before the
irq_eoi() takes place.

Fix this by clearing the interrupt request from .irq_ack() if we are
configured for edge triggered interrupts. This requires adopting the
fasteoi-ack flow instead of the fasteoi to ensure the ack gets called.

These changes have been tested using the power button on a
Developerbox/SC2A11 combined with some hackery in gpio-keys so I can
play with the different trigger mode [and an mdelay(500) so I can
can check what happens on a double click in both modes].

Fixes: 706cffc1b9 ("irqchip/exiu: Add support for Socionext Synquacer EXIU controller")
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220503134541.2566457-1-daniel.thompson@linaro.org
2022-05-04 16:33:17 +01:00
..
boot arm64: dts: qcom/sdm845-shift-axolotl: Fix boolean properties with values 2022-04-14 22:52:17 +02:00
configs ARM: DT updates for 5.18 2022-03-23 18:37:22 -07:00
crypto crypto: arm64 - cleanup comments 2022-03-09 15:12:32 +12:00
hyperv arm64: hyperv: Initialize hypervisor on boot 2021-08-04 16:54:36 +00:00
include x86: 2022-04-12 14:16:33 -10:00
kernel arm64: Add part number for Arm Cortex-A78AE 2022-04-08 11:46:46 +01:00
kvm KVM: arm64: mixed-width check should be skipped for uninitialized vCPUs 2022-04-06 12:29:45 +01:00
lib Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2022-03-21 16:02:36 -07:00
mm arm64: fix typos in comments 2022-04-04 10:32:50 +01:00
net kasan, arm64: don't tag executable vmalloc allocations 2022-03-24 19:06:48 -07:00
tools Merge branch 'for-next/spectre-bhb' into for-next/core 2022-03-14 19:08:31 +00:00
xen xen: allow pv-only hypercalls only with CONFIG_XEN_PV 2021-11-02 08:11:01 -05:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig Char/Misc and other driver updates for 5.18-rc1 2022-03-28 12:27:35 -07:00
Kconfig.debug
Kconfig.platforms irqchip/exiu: Fix acknowledgment of edge triggered interrupts 2022-05-04 16:33:17 +01:00
Makefile arm64/xor: use EOR3 instructions when available 2021-12-14 12:14:26 +00:00