irqchip/irq-brcmstb-l2: Replace brcmstb_l2_mask_and_ack() by generic function

Replace brcmstb_l2_mask_and_ack() by the generic
irq_gc_mask_disable_and_ack_set().

brcmstb_l2_mask_and_ack() was added in commit 49aa6ef0b439
("irqchip/brcmstb-l2: Remove some processing from the handler") in
September 2017 with a comment saying it was actually generic and someone
should add it to the generic code.

commit 20608924cc2e ("genirq: generic chip: Add
irq_gc_mask_disable_and_ack_set()") did that a few weeks later, however no
one went back and took the brcmstb variant out.

Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Link: https://lore.kernel.org/all/[e-mail]

drivers/irqchip/irq-brcmstb-l2.c

···
 	u32 saved_mask; /* for suspend/resume */
 };
 
-/**
- * brcmstb_l2_mask_and_ack - Mask and ack pending interrupt
- * @d: irq_data
- *
- * Chip has separate enable/disable registers instead of a single mask
- * register and pending interrupt is acknowledged by setting a bit.
- *
- * Note: This function is generic and could easily be added to the
- * generic irqchip implementation if there ever becomes a will to do so.
- * Perhaps with a name like irq_gc_mask_disable_and_ack_set().
- *
- * e.g.: https://patchwork.kernel.org/patch/9831047/
- */
-static void brcmstb_l2_mask_and_ack(struct irq_data *d)
-{
-	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
-	struct irq_chip_type *ct = irq_data_get_chip_type(d);
-	u32 mask = d->mask;
-
-	irq_gc_lock(gc);
-	irq_reg_writel(gc, mask, ct->regs.disable);
-	*ct->mask_cache &= ~mask;
-	irq_reg_writel(gc, mask, ct->regs.ack);
-	irq_gc_unlock(gc);
-}
-
 static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc)
 {
 	struct brcmstb_l2_intc_data *b = irq_desc_get_handler_data(desc);
···
 	if (init_params->cpu_clear >= 0) {
 		ct->regs.ack = init_params->cpu_clear;
 		ct->chip.irq_ack = irq_gc_ack_set_bit;
-		ct->chip.irq_mask_ack = brcmstb_l2_mask_and_ack;
+		ct->chip.irq_mask_ack = irq_gc_mask_disable_and_ack_set;
 	} else {
 		/* No Ack - but still slightly more efficient to define this */
 		ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;