[tip: irq/urgent] irqchip/renesas-rzg2l: Flush posted write in irq_eoi()

[tip-bot2 for Biju Das]

The following commit has been merged into the irq/urgent branch of tip:

Commit-ID:     9eec61df55c51415409c7cc47e9a1c8de94a0522
Gitweb:        https://git.kernel.org/tip/9eec61df55c51415409c7cc47e9a1c8de94a0522
Author:        Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
AuthorDate:    Tue, 05 Mar 2024 18:39:18 
Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitterDate: Mon, 18 Mar 2024 12:20:01 +01:00

irqchip/renesas-rzg2l: Flush posted write in irq_eoi()

The irq_eoi() callback of the RZ/G2L interrupt chip clears the relevant
interrupt cause bit in the TSCR register by writing to it.

This write is not sufficient because the write is posted and therefore not
guaranteed to immediately clear the bit. Due to that delay the CPU can
raise the just handled interrupt again.

Prevent this by reading the register back which causes the posted write to
be flushed to the hardware before the read completes.

Fixes: 3fed09559cd8 ("irqchip: Add RZ/G2L IA55 Interrupt Controller driver")
Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
 drivers/irqchip/irq-renesas-rzg2l.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index 9494fc2..5285bc8 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -99,8 +99,14 @@ static void rzg2l_irq_eoi(struct irq_data *d)
 	 * ISCR can only be cleared if the type is falling-edge, rising-edge or
 	 * falling/rising-edge.
 	 */
-	if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq)))
+	if ((iscr & bit) && (iitsr & IITSR_IITSEL_MASK(hw_irq))) {
 		writel_relaxed(iscr & ~bit, priv->base + ISCR);
+		/*
+		 * Enforce that the posted write is flushed to prevent that the
+		 * just handled interrupt is raised again.
+		 */
+		readl_relaxed(priv->base + ISCR);
+	}
 }
 
 static void rzg2l_tint_eoi(struct irq_data *d)
@@ -111,8 +117,14 @@ static void rzg2l_tint_eoi(struct irq_data *d)
 	u32 reg;
 
 	reg = readl_relaxed(priv->base + TSCR);
-	if (reg & bit)
+	if (reg & bit) {
 		writel_relaxed(reg & ~bit, priv->base + TSCR);
+		/*
+		 * Enforce that the posted write is flushed to prevent that the
+		 * just handled interrupt is raised again.
+		 */
+		readl_relaxed(priv->base + TSCR);
+	}
 }
 
 static void rzg2l_irqc_eoi(struct irq_data *d)