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IRQCHIP: brcmstb-l2: don't clear wakeable interrupts at init time

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Wakeable interrupts might be pending at boot/init time, because wakeup
interrupts might have triggered a resume from S5. So don't clear such
wakeups.

This means that any driver which requests a wakeable interrupt bit
should be prepared to handle an interrupt as soon as they call
request_irq(). (This is technically already the correct development
practice, but some drivers probably expect not to receive interrupts
until they have performed some I/O.)

Signed-off-by: Brian Norris <[email protected]>
Signed-off-by: Kevin Cernekee <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/8840/
Signed-off-by: Ralf Baechle <[email protected]>
This commit is contained in:
Brian Norris 2014-12-25 09:49:02 -08:00 • committed by Ralf Baechle
commit c9ae71e0f7
1 changed files with 6 additions and 3 deletions
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9
drivers/irqchip/irq-brcmstb-l2.c
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@ -136,7 +136,11 @@ int __init brcmstb_l2_intc_of_init(struct device_node *np,
/* Disable all interrupts by default */
writel(0xffffffff, data->base + CPU_MASK_SET);
writel(0xffffffff, data->base + CPU_CLEAR);
/* Wakeup interrupts may be retained from S5 (cold boot) */
data->can_wake = of_property_read_bool(np, "brcm,irq-can-wake");
if (!data->can_wake)
writel(0xffffffff, data->base + CPU_CLEAR);
data->parent_irq = irq_of_parse_and_map(np, 0);
if (!data->parent_irq) {
@ -188,8 +192,7 @@ int __init brcmstb_l2_intc_of_init(struct device_node *np,
ct->chip.irq_suspend = brcmstb_l2_intc_suspend;
ct->chip.irq_resume = brcmstb_l2_intc_resume;
if (of_property_read_bool(np, "brcm,irq-can-wake")) {
data->can_wake = true;
if (data->can_wake) {
/* This IRQ chip can wake the system, set all child interrupts
* in wake_enabled mask
*/