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>
diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 6f8f0c1..bb5e103 100644
--- a/drivers/base/regmap/regmap-irq.c
+++ b/drivers/base/regmap/regmap-irq.c
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
}
}
+ if (chip->runtime_pm)
+ pm_runtime_put(map->dev);
+
if (handled)
return IRQ_HANDLED;
else