mfd: pm8921: Update for genirq changes

Since this code has been marked broken for some time a few genirq
tree wide changes weren't made. set_irq_wake() was renamed to
irq_set_irq_wake() in commit a0cd9ca2 (genirq: Namespace
cleanup, 2011-02-10) and commit 10a8c383 (irq: introduce entry
and exit functions for chained handlers) introduced the chained
irq functions but this driver wasn't updated to use them. Fix
these problems and remove the BROKEN marking on this driver.
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

drivers/mfd/Kconfig

@@ -479,7 +479,6 @@ config MFD_PM8XXX
 config MFD_PM8921_CORE
 	tristate "Qualcomm PM8921 PMIC chip"
 	depends on (ARCH_MSM || HEXAGON)
-	depends on BROKEN
 	select MFD_CORE
 	select MFD_PM8XXX
 	help

drivers/mfd/pm8921-core.c

@@ -15,6 +15,7 @@
 
 #include <linux/kernel.h>
 #include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -174,6 +175,8 @@ static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
 	u8	root;
 	int	i, ret, masters = 0;
 
+	chained_irq_enter(irq_chip, desc);
+
 	ret = pm8xxx_read_root_irq(chip, &root);
 	if (ret) {
 		pr_err("Can't read root status ret=%d\n", ret);
@@ -188,7 +191,7 @@ static void pm8xxx_irq_handler(unsigned int irq, struct irq_desc *desc)
 		if (masters & (1 << i))
 			pm8xxx_irq_master_handler(chip, i);
 
-	irq_chip->irq_ack(&desc->irq_data);
+	chained_irq_exit(irq_chip, desc);
 }
 
 static void pm8xxx_irq_mask_ack(struct irq_data *d)
@@ -367,7 +370,7 @@ static struct pm_irq_chip *pm8xxx_irq_init(struct device *dev,
 	irq_set_irq_type(devirq, pdata->irq_trigger_flag);
 	irq_set_handler_data(devirq, chip);
 	irq_set_chained_handler(devirq, pm8xxx_irq_handler);
-	set_irq_wake(devirq, 1);
+	irq_set_irq_wake(devirq, 1);
 
 	return chip;
 }