diff options
| author | Brian Norris <computersforpeace@gmail.com> | 2015-07-22 16:21:40 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-07-27 08:09:38 +0200 |
| commit | fd537766715e9b6bf7ff07abb22f4817201433db (patch) | |
| tree | 963ba098d42265895cf79ab168067e4f5030a336 /drivers/irqchip/irq-bcm7120-l2.c | |
| parent | be9b22b6a7e6725162c64155a08b71f0654b675c (diff) | |
| download | lwn-fd537766715e9b6bf7ff07abb22f4817201433db.tar.gz lwn-fd537766715e9b6bf7ff07abb22f4817201433db.zip | |
irqchip/bcm7120-l2: Perform suspend/resume even without installed child IRQs
Make use of the new irq_chip_generic suspend/resume callbacks.
This is required because if there are no installed child IRQs for this
chip, the irq_chip::irq_{suspend,resume} functions will not be called.
However, we still need to save/restore the forwarding mask, to enable
the top-level GIC interrupt; otherwise, we lose UART output after S3
resume.
In addition to refactoring the callbacks, we have to self-initialize the
mask cache, since the genirq core also doesn't initialize this until the
first child IRQ is installed.
The original problem report is described in extra detail here:
http://lkml.kernel.org/g/20150619224123.GL4917@ld-irv-0074
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Cc: Gregory Fong <gregory.0xf0@gmail.com>
Cc: bcm-kernel-feedback-list@broadcom.com
Cc: linux-mips@linux-mips.org
Cc: Kevin Cernekee <cernekee@chromium.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Link: http://lkml.kernel.org/r/1437607300-40858-2-git-send-email-computersforpeace@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/irqchip/irq-bcm7120-l2.c')
| -rw-r--r-- | drivers/irqchip/irq-bcm7120-l2.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/irqchip/irq-bcm7120-l2.c b/drivers/irqchip/irq-bcm7120-l2.c index 88c9719e5d33..c885a5c4632a 100644 --- a/drivers/irqchip/irq-bcm7120-l2.c +++ b/drivers/irqchip/irq-bcm7120-l2.c @@ -80,11 +80,10 @@ static void bcm7120_l2_intc_irq_handle(unsigned int irq, struct irq_desc *desc) chained_irq_exit(chip, desc); } -static void bcm7120_l2_intc_suspend(struct irq_data *d) +static void bcm7120_l2_intc_suspend(struct irq_chip_generic *gc) { - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); - struct irq_chip_type *ct = irq_data_get_chip_type(d); struct bcm7120_l2_intc_data *b = gc->private; + struct irq_chip_type *ct = gc->chip_types; irq_gc_lock(gc); if (b->can_wake) @@ -93,10 +92,9 @@ static void bcm7120_l2_intc_suspend(struct irq_data *d) irq_gc_unlock(gc); } -static void bcm7120_l2_intc_resume(struct irq_data *d) +static void bcm7120_l2_intc_resume(struct irq_chip_generic *gc) { - struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); - struct irq_chip_type *ct = irq_data_get_chip_type(d); + struct irq_chip_type *ct = gc->chip_types; /* Restore the saved mask */ irq_gc_lock(gc); @@ -279,8 +277,15 @@ int __init bcm7120_l2_intc_probe(struct device_node *dn, ct->chip.irq_mask = irq_gc_mask_clr_bit; ct->chip.irq_unmask = irq_gc_mask_set_bit; ct->chip.irq_ack = irq_gc_noop; - ct->chip.irq_suspend = bcm7120_l2_intc_suspend; - ct->chip.irq_resume = bcm7120_l2_intc_resume; + gc->suspend = bcm7120_l2_intc_suspend; + gc->resume = bcm7120_l2_intc_resume; + + /* + * Initialize mask-cache, in case we need it for + * saving/restoring fwd mask even w/o any child interrupts + * installed + */ + gc->mask_cache = irq_reg_readl(gc, ct->regs.mask); if (data->can_wake) { /* This IRQ chip can wake the system, set all |