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@xxxxxxxxxxxxxxx
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
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)
--
2.43.0
