lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

mfd: Ensure WM831x charger interrupts are acknowledged when suspending

Browse Source 
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>
This commit is contained in:
Mark Brown
2010-04-08 10:02:39 +02:00
committed by Samuel Ortiz
parent 0d7e0e399d
commit b03b4d7cdd
2 changed files with 50 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/mfd/wm831x/core.h
View File

@ -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;