irqchip/ast2700-intc: Disable all interrupt merge banks on probe

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The INTC0 interrupt-merge (INTM) space has 50 sources at 10 per bank, i.e.
INTC0_INTM_NUM / INTM_IRQS_PER_BANK = 5 banks. This is reflected everywhere
the banks are indexed: the aspeed_intc0_intm_routes[] table has 5 valid
entries, and the mask/unmask/eoi paths compute the bank as (hwirq -
INTM_BASE) / INTM_IRQS_PER_BANK, spanning banks 0-4.

However, INTC0_INTM_BANK_NUM is hardcoded to 3, so
aspeed_intc0_disable_intm() only clears IER for banks 0-2 at probe. Banks 3
and 4 are left in whatever state the firmware configured them , which can
leave interrupts enabled before a handler is installed.

Derive the bank count from the source count so the probe-time disable
covers every bank.

Fixes: 07825e4151 ("irqchip/ast2700-intc: Add AST2700-A2 support")
Signed-off-by: Michael Pesa <michael.pesa@icloud.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260722050243.298355-1-michael.pesa@icloud.com

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Michael Pesa 2026-07-21 22:02:43 -07:00 • committed by Thomas Gleixner

parent b76eee9c21

commit 34b7e953d1

1 changed files with 1 additions and 1 deletions

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drivers/irqchip/irq-ast2700-intc0.c

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