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>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/base/regmap/regmap-irq.c b/drivers/base/regmap/regmap-irq.c
index 6f8f0c1e550f..bb5e10305197 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 @@ 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