[PATCH 06/12] soc: fsl: qe: Iterate over all pending interrupts in cascade handler

[Paul Louvel]

Instead of only servicing a single interrupt, the chained handler can
handle all IRQs that have their bit set in the event register.
This avoid multiple parent IRQ handler being serviced if more than one
interrupt are pending on the QE PIC.

Remove unused code.

Signed-off-by: Paul Louvel <paul.louvel at bootlin.com>
---
 drivers/soc/fsl/qe/qe_ports_ic.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/soc/fsl/qe/qe_ports_ic.c b/drivers/soc/fsl/qe/qe_ports_ic.c
index 3bca116fd2f5..27b62f4e3afb 100644
--- a/drivers/soc/fsl/qe/qe_ports_ic.c
+++ b/drivers/soc/fsl/qe/qe_ports_ic.c
@@ -5,6 +5,7 @@
  * Copyright (c) 2025 Christophe Leroy CS GROUP France (christophe.leroy at csgroup.eu)
  */
 
+#include <linux/bitops.h>
 #include <linux/irq.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
@@ -67,25 +68,17 @@ static struct irq_chip qepic = {
 	.irq_set_type = qepic_set_type,
 };
 
-static int qepic_get_irq(struct irq_desc *desc)
-{
-	struct qepic_data *data = irq_desc_get_handler_data(desc);
-	u32 event = in_be32(data->reg + CEPIER);
-
-	if (!event)
-		return -1;
-
-	return 32 - ffs(event);
-}
-
 static void qepic_cascade(struct irq_desc *desc)
 {
 	struct qepic_data *data = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
+	unsigned long event, bit;
 
 	chained_irq_enter(chip, desc);
 
-	generic_handle_domain_irq(data->host, qepic_get_irq(desc));
+	event = in_be32(data->reg + CEPIER);
+	for_each_set_bit(bit, &event, 32)
+		generic_handle_domain_irq(data->host, 32 - bit);
 
 	chained_irq_exit(chip, desc);
 }

-- 
2.55.0