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regmap: irq: Enable devices for runtime PM while handling interrupts

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Some devices need to have a runtime PM reference while handling interrupts
to ensure that the register I/O is available. Support this with a flag in
the chip.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-07-24 15:41:19 +01:00
parent 40052ca0c2
commit 0c00c50b41
2 changed files with 27 additions and 0 deletions
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25
drivers/base/regmap/regmap-irq.c
View File

@ -16,6 +16,7 @@
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "internal.h"
@ -62,6 +63,13 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
int i, ret;
u32 reg;
if (d->chip->runtime_pm) {
ret = pm_runtime_get_sync(map->dev);
if (ret < 0)
dev_err(map->dev, "IRQ sync failed to resume: %d\n",
ret);
}
/*
* If there's been a change in the mask write it back to the
* hardware. We rely on the use of the regmap core cache to
@ -77,6 +85,9 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
reg);
}
if (d->chip->runtime_pm)
pm_runtime_put(map->dev);
/* If we've changed our wakeup count propagate it to the parent */
if (d->wake_count < 0)
for (i = d->wake_count; i < 0; i++)
@ -147,6 +158,15 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
bool handled = false;
u32 reg;
if (chip->runtime_pm) {
ret = pm_runtime_get_sync(map->dev);
if (ret < 0) {
dev_err(map->dev, "IRQ thread failed to resume: %d\n",
ret);
return IRQ_NONE;
}
}
/*
* Ignore masked IRQs and ack if we need to; we ack early so
* there is no race between handling and acknowleding the
@ -162,6 +182,8 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
if (ret != 0) {
dev_err(map->dev, "Failed to read IRQ status: %d\n",
ret);
if (chip->runtime_pm)
pm_runtime_put(map->dev);
return IRQ_NONE;
}
@ -185,6 +207,9 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
}
}
if (chip->runtime_pm)
pm_runtime_put(map->dev);
if (handled)
return IRQ_HANDLED;
else

2
include/linux/regmap.h
View File

@ -285,6 +285,7 @@ struct regmap_irq {
* @ack_base: Base ack address. If zero then the chip is clear on read.
* @wake_base: Base address for wake enables. If zero unsupported.
* @irq_reg_stride: Stride to use for chips where registers are not contiguous.
* @runtime_pm: Hold a runtime PM lock on the device when accessing it.
*
* @num_regs: Number of registers in each control bank.
* @irqs: Descriptors for individual IRQs. Interrupt numbers are
@ -299,6 +300,7 @@ struct regmap_irq_chip {
unsigned int ack_base;
unsigned int wake_base;
unsigned int irq_reg_stride;
bool runtime_pm;
int num_regs;