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 based on the hardware manual as a countermeasure.
Fixes: 0d7605e75ac2 ("irqchip: Add RZ/V2H(P) Interrupt Control Unit (ICU) driver") Cc: stable@vger.kernel.org Signed-off-by: Biju Das biju.das.jz@bp.renesas.com --- drivers/irqchip/irq-renesas-rzv2h.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/irqchip/irq-renesas-rzv2h.c b/drivers/irqchip/irq-renesas-rzv2h.c index 3d5b5fdf9bde..2d2cca3bce17 100644 --- a/drivers/irqchip/irq-renesas-rzv2h.c +++ b/drivers/irqchip/irq-renesas-rzv2h.c @@ -170,6 +170,13 @@ 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 based on 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)