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authorThomas Gleixner <tglx@linutronix.de>2014-02-23 21:40:13 +0000
committerThomas Gleixner <tglx@linutronix.de>2014-03-04 17:37:52 +0100
commit49f3fbc7b8576fd578f3504c65aae9b8a212d0f6 (patch)
treece53b9d16b3345d56df43f45dbef9625621c22be /arch/arm/mach-mmp
parent8435cf757632a5559fbbf1cb79299716c8d5b651 (diff)
downloadop-kernel-dev-49f3fbc7b8576fd578f3504c65aae9b8a212d0f6.zip
op-kernel-dev-49f3fbc7b8576fd578f3504c65aae9b8a212d0f6.tar.gz
arm: mmp: Remove pointless fiddling with irq internals
The pm-mmp2 and pm-pxa910 power management related irq_set_wake callbacks fiddle pointlessly with the irq actions for no reason except for lack of understanding how the wakeup mechanism works. On supsend the core disables all interrupts lazily, i.e. it does not mask them at the irq controller level. So any interrupt which is firing during suspend will mark the corresponding interrupt line as pending. Just before the core powers down it checks whether there are interrupts pending from interrupt lines which are marked as wakeup sources and if so it aborts the suspend and resends the interrupts. If there was no interrupt at this point, the cpu goes into suspend with these interrupts unmasked. The IRQF_NO_SUSPEND flag for interrupt actions is a totally different mechanism. That allows the device driver to prevent the core from disabling the interrupt despite the fact that it is not marked as a wakeup source. This has nothing to do with the case at hand. It was introduced for special cases where lazy disable is not possible. Remove the nonsense along with the braindamaged boundary check. The core code does NOT call these functions out of boundary. Add a FIXME comment to an unhandled error path which merily printks some useless blurb instead of returning a proper error code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: arm <linux-arm-kernel@lists.infradead.org> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Link: http://lkml.kernel.org/r/20140223212737.214342433@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/arm/mach-mmp')
-rw-r--r--arch/arm/mach-mmp/pm-mmp2.c16
-rw-r--r--arch/arm/mach-mmp/pm-pxa910.c20
2 files changed, 5 insertions, 31 deletions
diff --git a/arch/arm/mach-mmp/pm-mmp2.c b/arch/arm/mach-mmp/pm-mmp2.c
index 461a191..43b1a51 100644
--- a/arch/arm/mach-mmp/pm-mmp2.c
+++ b/arch/arm/mach-mmp/pm-mmp2.c
@@ -27,22 +27,8 @@
int mmp2_set_wake(struct irq_data *d, unsigned int on)
{
- int irq = d->irq;
- struct irq_desc *desc = irq_to_desc(irq);
unsigned long data = 0;
-
- if (unlikely(irq >= nr_irqs)) {
- pr_err("IRQ nubmers are out of boundary!\n");
- return -EINVAL;
- }
-
- if (on) {
- if (desc->action)
- desc->action->flags |= IRQF_NO_SUSPEND;
- } else {
- if (desc->action)
- desc->action->flags &= ~IRQF_NO_SUSPEND;
- }
+ int irq = d->irq;
/* enable wakeup sources */
switch (irq) {
diff --git a/arch/arm/mach-mmp/pm-pxa910.c b/arch/arm/mach-mmp/pm-pxa910.c
index 48981ca..04c9daf 100644
--- a/arch/arm/mach-mmp/pm-pxa910.c
+++ b/arch/arm/mach-mmp/pm-pxa910.c
@@ -27,22 +27,8 @@
int pxa910_set_wake(struct irq_data *data, unsigned int on)
{
- int irq = data->irq;
- struct irq_desc *desc = irq_to_desc(data->irq);
uint32_t awucrm = 0, apcr = 0;
-
- if (unlikely(irq >= nr_irqs)) {
- pr_err("IRQ nubmers are out of boundary!\n");
- return -EINVAL;
- }
-
- if (on) {
- if (desc->action)
- desc->action->flags |= IRQF_NO_SUSPEND;
- } else {
- if (desc->action)
- desc->action->flags &= ~IRQF_NO_SUSPEND;
- }
+ int irq = data->irq;
/* setting wakeup sources */
switch (irq) {
@@ -115,9 +101,11 @@ int pxa910_set_wake(struct irq_data *data, unsigned int on)
if (irq >= IRQ_GPIO_START && irq < IRQ_BOARD_START) {
awucrm = MPMU_AWUCRM_WAKEUP(2);
apcr |= MPMU_APCR_SLPWP2;
- } else
+ } else {
+ /* FIXME: This should return a proper error code ! */
printk(KERN_ERR "Error: no defined wake up source irq: %d\n",
irq);
+ }
}
if (on) {
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