linux-kernel - [PATCH v3] pinctrl: renesas: rzg2l: Configure the interrupt type on resume

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Date: Fri, 19 Apr 2024 09:19:24 +0300
From: Claudiu <claudiu.beznea@...on.dev>
To: geert+renesas@...der.be,
	linus.walleij@...aro.org,
	biju.das.jz@...renesas.com,
	tglx@...utronix.de
Cc: linux-renesas-soc@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v3] pinctrl: renesas: rzg2l: Configure the interrupt type on resume

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

Commit dce0919c83c3 ("irqchip/renesas-rzg2l: Do not set TIEN and TINT
source at the same time") removed the setup of TINT from
rzg2l_irqc_irq_enable(). To address the spourious interrupt issue the setup
of TINT has been moved in rzg2l_tint_set_edge() though
rzg2l_disable_tint_and_set_tint_source(). With this, the interrupts are
not properly re-configured after a suspend-to-RAM cycle. To address
this issue and avoid spurious interrupts while resumming set the
interrupt type before enabling it.

Fixes: dce0919c83c3 ("irqchip/renesas-rzg2l: Do not set TIEN and TINT source at the same time")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v3:
- moved dev_crit() out of critical section

Changes in v2:
- none; this patch was part of series at [1] and added in v2 of that
  series

[1] https://lore.kernel.org/all/20240320104230.446400-1-claudiu.beznea.uj@bp.renesas.com/

 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 93916553bcc7..20425afc6b33 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -2045,7 +2045,9 @@ static void rzg2l_gpio_irq_restore(struct rzg2l_pinctrl *pctrl)
 
 	for (unsigned int i = 0; i < RZG2L_TINT_MAX_INTERRUPT; i++) {
 		struct irq_data *data;
+		unsigned long flags;
 		unsigned int virq;
+		int ret;
 
 		if (!pctrl->hwirq[i])
 			continue;
@@ -2063,17 +2065,18 @@ static void rzg2l_gpio_irq_restore(struct rzg2l_pinctrl *pctrl)
 			continue;
 		}
 
-		if (!irqd_irq_disabled(data)) {
-			unsigned long flags;
-
-			/*
-			 * This has to be atomically executed to protect against a concurrent
-			 * interrupt.
-			 */
-			raw_spin_lock_irqsave(&pctrl->lock.rlock, flags);
+		/*
+		 * This has to be atomically executed to protect against a concurrent
+		 * interrupt.
+		 */
+		raw_spin_lock_irqsave(&pctrl->lock.rlock, flags);
+		ret = rzg2l_gpio_irq_set_type(data, irqd_get_trigger_type(data));
+		if (!ret && !irqd_irq_disabled(data))
 			rzg2l_gpio_irq_enable(data);
-			raw_spin_unlock_irqrestore(&pctrl->lock.rlock, flags);
-		}
+		raw_spin_unlock_irqrestore(&pctrl->lock.rlock, flags);
+
+		if (ret)
+			dev_crit(pctrl->dev, "Failed to set IRQ type for virq=%u\n", virq);
 	}
 }
 
-- 
2.39.2