FAILED: patch "[PATCH] irqchip/renesas-rzv2h: Preserve TIEN state in rzv2h_tint_set_type()" failed to apply to 6.18-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.18-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y
git checkout FETCH_HEAD
git cherry-pick -x 42bedd4af8cd50c32a1560d8744bd22d25be79cc
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107051143-failed-6.18-42bedd4af8cd@kernel.org' --subject-prefix 'PATCH 6.18.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 42bedd4af8cd50c32a1560d8744bd22d25be79cc Mon Sep 17 00:00:00 2001
From: Au Dang <au.dang.jx@renesas.com>
Date: Wed, 14 Oct 2026 11:59:22 +0200
Subject: [PATCH] irqchip/renesas-rzv2h: Preserve TIEN state in
 rzv2h_tint_set_type()

rzv2h_tint_set_type() clears TIEN while switching the TINT source and
then unconditionally sets it again, enabling the interrupt even if it
was disabled before the call.

Restore the previous TIEN state instead of forcing it on.

Fixes: 0d7605e75ac2 ("irqchip: Add RZ/V2H(P) Interrupt Control Unit (ICU) driver")
Signed-off-by: Au Dang <au.dang.jx@renesas.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261014095927.635132-1-tommaso.merciai.xr@bp.renesas.com
---
 drivers/irqchip/irq-renesas-rzv2h.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-renesas-rzv2h.c b/drivers/irqchip/irq-renesas-rzv2h.c
index 1a4703a353e95..485c3eea76328 100644
--- a/drivers/irqchip/irq-renesas-rzv2h.c
+++ b/drivers/irqchip/irq-renesas-rzv2h.c
@@ -420,9 +420,9 @@ static void rzv2h_clear_tint_int(struct rzv2h_icu_priv *priv, unsigned int hwirq
 static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 {
 	u32 titsr, titsr_k, titsel_n, tien;
+	u32 titsr_cur, tssr_cur, tien_cur;
 	struct rzv2h_icu_priv *priv;
 	u32 tssr, tssr_k, tssel_n;
-	u32 titsr_cur, tssr_cur;
 	unsigned int hwirq;
 	u32 tint, sense;
 	int tint_nr;
@@ -477,6 +477,8 @@ static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 		if (tssr_cur == tint && titsr_cur == sense)
 			goto set_parent_type;
 
+		tien_cur = tssr & tien;
+
 		tssr &= ~(ICU_TSSR_TSSEL_MASK(tssel_n, priv->info->field_width) | tien);
 		tssr |= ICU_TSSR_TSSEL_PREP(tint, tssel_n, priv->info->field_width);
 
@@ -489,7 +491,7 @@ static int rzv2h_tint_set_type(struct irq_data *d, unsigned int type)
 
 		rzv2h_clear_tint_int(priv, hwirq);
 
-		writel_relaxed(tssr | tien, priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));
+		writel_relaxed(tssr | tien_cur, priv->base + priv->info->t_offs + ICU_TSSR(tssr_k));
 	}
 set_parent_type:
 	return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
-- 
2.53.0