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irqchip/renesas-rzv2h: Prevent TINT spurious interrupt

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A spurious TINT interrupt is seen during boot on RZ/G3E SMARC EVK.

A glitch in the edge detection circuit can cause a spurious interrupt.

Clear the status flag after setting the ICU_TSSRk registers, which is
recommended in the hardware manual as a countermeasure.

Fixes: 0d7605e75ac2 ("irqchip: Add RZ/V2H(P) Interrupt Control Unit (ICU) driver")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
This commit is contained in:
Biju Das 2025-04-15 11:33:41 +01:00 committed by Thomas Gleixner
parent fbb429ddff
commit 28e89cdac6
1 changed files with 8 additions and 0 deletions
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8
drivers/irqchip/irq-renesas-rzv2h.c
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@ -170,6 +170,14 @@ static void rzv2h_tint_irq_endisable(struct irq_data *d, bool enable)
else
tssr &= ~ICU_TSSR_TIEN(tssel_n, priv->info->field_width);
writel_relaxed(tssr, priv->base + priv->info->t_offs + ICU_TSSR(k));
/*
* A glitch in the edge detection circuit can cause a spurious
* interrupt. Clear the status flag after setting the ICU_TSSRk
* registers, which is recommended by the hardware manual as a
* countermeasure.
*/
writel_relaxed(BIT(tint_nr), priv->base + priv->info->t_offs + ICU_TSCLR);
}
static void rzv2h_icu_irq_disable(struct irq_data *d)