regmap: irq: Enable devices for runtime PM while handling interrupts
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>
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@ -16,6 +16,7 @@
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/irqdomain.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include "internal.h"
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@ -62,6 +63,13 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
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int i, ret;
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u32 reg;
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if (d->chip->runtime_pm) {
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ret = pm_runtime_get_sync(map->dev);
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if (ret < 0)
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dev_err(map->dev, "IRQ sync failed to resume: %d\n",
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ret);
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}
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/*
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* If there's been a change in the mask write it back to the
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* hardware. We rely on the use of the regmap core cache to
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@ -77,6 +85,9 @@ static void regmap_irq_sync_unlock(struct irq_data *data)
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reg);
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}
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if (d->chip->runtime_pm)
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pm_runtime_put(map->dev);
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/* If we've changed our wakeup count propagate it to the parent */
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if (d->wake_count < 0)
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for (i = d->wake_count; i < 0; i++)
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@ -147,6 +158,15 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
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bool handled = false;
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u32 reg;
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if (chip->runtime_pm) {
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ret = pm_runtime_get_sync(map->dev);
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if (ret < 0) {
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dev_err(map->dev, "IRQ thread failed to resume: %d\n",
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ret);
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return IRQ_NONE;
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}
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}
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/*
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* Ignore masked IRQs and ack if we need to; we ack early so
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* there is no race between handling and acknowleding the
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@ -162,6 +182,8 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
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if (ret != 0) {
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dev_err(map->dev, "Failed to read IRQ status: %d\n",
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ret);
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if (chip->runtime_pm)
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pm_runtime_put(map->dev);
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return IRQ_NONE;
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}
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@ -185,6 +207,9 @@ static irqreturn_t regmap_irq_thread(int irq, void *d)
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}
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}
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if (chip->runtime_pm)
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pm_runtime_put(map->dev);
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if (handled)
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return IRQ_HANDLED;
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else
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@ -285,6 +285,7 @@ struct regmap_irq {
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* @ack_base: Base ack address. If zero then the chip is clear on read.
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* @wake_base: Base address for wake enables. If zero unsupported.
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* @irq_reg_stride: Stride to use for chips where registers are not contiguous.
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* @runtime_pm: Hold a runtime PM lock on the device when accessing it.
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*
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* @num_regs: Number of registers in each control bank.
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* @irqs: Descriptors for individual IRQs. Interrupt numbers are
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@ -299,6 +300,7 @@ struct regmap_irq_chip {
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unsigned int ack_base;
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unsigned int wake_base;
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unsigned int irq_reg_stride;
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bool runtime_pm;
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int num_regs;
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