mfd: Ensure WM831x charger interrupts are acknowledged when suspending

The charger interrupts on the WM831x are unconditionally a wake source
for the system. If the power driver is not able to monitor them (for
example, due to the IRQ line not having been wired up on the system)
then any charger interrupt will prevent the system suspending for any
meaningful amount of time since nothing will ack them.

Avoid this issue by manually acknowledging these interrupts when we
suspend the WM831x core device if they are masked. If software is
actually using the interrupts then they will be unmasked and this
change will have no effect.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
index 5915f6e3d9ab..eb5bd4e0e03c 100644
--- a/include/linux/mfd/wm831x/core.h
+++ b/include/linux/mfd/wm831x/core.h
@@ -256,8 +256,9 @@ struct wm831x {
         int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */
 
         /* Chip revision based flags */
-        unsigned has_gpio_ena:1;  /* Has GPIO enable bit */
-        unsigned has_cs_sts:1;    /* Has current sink status bit */
+        unsigned has_gpio_ena:1;         /* Has GPIO enable bit */
+        unsigned has_cs_sts:1;           /* Has current sink status bit */
+        unsigned charger_irq_wake:1;     /* Are charger IRQs a wake source? */
 
         int num_gpio;