linux-kernel - [PATCH 2/3] irqchip: renesas-rzg2l: Mask interrupts for changing interrupt settings

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Date:   Mon, 18 Sep 2023 13:24:10 +0100
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Biju Das <biju.das.au@...il.com>, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: [PATCH 2/3] irqchip: renesas-rzg2l: Mask interrupts for changing interrupt settings

As per RZ/G2L hardware manual Rev.1.30 section 8.8.3 Precaution when
changing interrupt settings,  we need to mask the interrupts for
any changes in below settings:

 * When changing the noise filter settings.
 * When switching the GPIO pins to IRQ or GPIOINT.
 * When changing the source of TINT.
 * When changing the interrupt detection method.

This patch masks the interrupts when there is a change in the interrupt
detection method and changing the source of TINT.

Fixes: 3fed09559cd8 ("irqchip: Add RZ/G2L IA55 Interrupt Controller driver")
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
Tested-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/irqchip/irq-renesas-rzg2l.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index 2cee5477be6b..33a22bafedcd 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -116,11 +116,13 @@ static void rzg2l_irqc_irq_disable(struct irq_data *d)
 		u8 tssr_index = TSSR_INDEX(offset);
 		u32 reg;
 
+		irq_chip_mask_parent(d);
 		raw_spin_lock(&priv->lock);
 		reg = readl_relaxed(priv->base + TSSR(tssr_index));
 		reg &= ~(TSSEL_MASK << TSSEL_SHIFT(tssr_offset));
 		writel_relaxed(reg, priv->base + TSSR(tssr_index));
 		raw_spin_unlock(&priv->lock);
+		irq_chip_unmask_parent(d);
 	}
 	irq_chip_disable_parent(d);
 }
@@ -137,11 +139,13 @@ static void rzg2l_irqc_irq_enable(struct irq_data *d)
 		u8 tssr_index = TSSR_INDEX(offset);
 		u32 reg;
 
+		irq_chip_mask_parent(d);
 		raw_spin_lock(&priv->lock);
 		reg = readl_relaxed(priv->base + TSSR(tssr_index));
 		reg |= (TIEN | tint) << TSSEL_SHIFT(tssr_offset);
 		writel_relaxed(reg, priv->base + TSSR(tssr_index));
 		raw_spin_unlock(&priv->lock);
+		irq_chip_unmask_parent(d);
 	}
 	irq_chip_enable_parent(d);
 }
@@ -226,10 +230,12 @@ static int rzg2l_irqc_set_type(struct irq_data *d, unsigned int type)
 	unsigned int hw_irq = irqd_to_hwirq(d);
 	int ret = -EINVAL;
 
+	irq_chip_mask_parent(d);
 	if (hw_irq >= IRQC_IRQ_START && hw_irq <= IRQC_IRQ_COUNT)
 		ret = rzg2l_irq_set_type(d, type);
 	else if (hw_irq >= IRQC_TINT_START && hw_irq < IRQC_NUM_IRQ)
 		ret = rzg2l_tint_set_edge(d, type);
+	irq_chip_unmask_parent(d);
 	if (ret)
 		return ret;
 
-- 
2.25.1