irqchip/gic-v5: Preserve ICC_CR0_EL1 state

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In addition to EN, ICC_CR0_EL1 contains other fields, such as LINK and
LINK_IDLE. The driver only needs to modify EN, and must preserve the
values of all other fields when enabling or disabling the CPU
interface.

Define the missing LINK and LINK_IDLE fields, and use read-modify-write
accesses to update EN without affecting the rest of ICC_CR0_EL1.

Fixes: 7ec80fb3f0 ("irqchip/gic-v5: Add GICv5 PPI support")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260907164945.714545-1-sascha.bischoff@arm.com
Closes: https://lore.kernel.org/r/20260807121703.D4B7A1F00A3A@smtp.kernel.org

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Sascha Bischoff 2026-09-07 16:49:50 +00:00 • committed by Thomas Gleixner

parent df2908090c

commit 1017911fcc

2 changed files with 7 additions and 3 deletions

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arch/arm64/tools/sysreg

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drivers/irqchip/irq-gic-v5.c

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