The following commit has been merged into the irq/urgent branch of tip:

Commit-ID: 28e89cdac6482f3c980df3e2e245db7366269124 Gitweb: https://git.kernel.org/tip/28e89cdac6482f3c980df3e2e245db7366269124 Author: Biju Das biju.das.jz@bp.renesas.com AuthorDate: Tue, 15 Apr 2025 11:33:41 +01:00 Committer: Thomas Gleixner tglx@linutronix.de CommitterDate: Wed, 16 Apr 2025 14:29:38 +02:00

irqchip/renesas-rzv2h: Prevent TINT spurious interrupt

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

--- drivers/irqchip/irq-renesas-rzv2h.c | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/drivers/irqchip/irq-renesas-rzv2h.c b/drivers/irqchip/irq-renesas-rzv2h.c index 3d5b5fd..0f0fd7d 100644 --- a/drivers/irqchip/irq-renesas-rzv2h.c +++ b/drivers/irqchip/irq-renesas-rzv2h.c @@ -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)