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genirq: Add chip_[suspend|resume] PM support to irq_chip

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Some (admittedly odd) irqchips perform functions that are not directly
related to any of their child IRQ lines, and therefore need to perform
some tasks during suspend/resume regardless of whether there are
any "installed" interrupts for the irqchip. However, the current
generic-chip framework does not call the chip's irq_{suspend,resume}
when there are no interrupts installed (this makes sense, because there
are no irq_data objects for such a call to be made).

More specifically, irq-bcm7120-l2 configures both a forwarding mask
(which affects other top-level GIC IRQs) and a second-level interrupt
mask (for managing its own child interrupts). The former must be
saved/restored on suspend/resume, even when there's nothing to do for
the latter.

This patch adds a new set of suspend/resume hooks to irq_chip_generic,
to help represent *chip* suspend/resume, rather than IRQ suspend/resume.
These callbacks will always be called for an IRQ chip (regardless of the
installed interrupts) and are based on the per-chip irq_chip_generic
struct, rather than the per-IRQ irq_data struct.

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/1437607300-40858-1-git-send-email-computersforpeace@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Brian Norris
2015-07-22 16:21:39 -07:00
committed by Thomas Gleixner
parent c376023b70
commit be9b22b6a7
2 changed files with 18 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
include/linux/irq.h
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@@ -324,8 +324,10 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
* @irq_bus_sync_unlock:function to sync and unlock slow bus (i2c) chips
* @irq_cpu_online: configure an interrupt source for a secondary CPU
* @irq_cpu_offline: un-configure an interrupt source for a secondary CPU
* @irq_suspend: function called from core code on suspend once per chip
* @irq_resume: function called from core code on resume once per chip
* @irq_suspend: function called from core code on suspend once per
* chip, when one or more interrupts are installed
* @irq_resume: function called from core code on resume once per chip,
* when one ore more interrupts are installed
* @irq_pm_shutdown: function called from core code on shutdown once per chip
* @irq_calc_mask: Optional function to set irq_data.mask for special cases
* @irq_print_chip: optional to print special chip info in show_interrupts
@@ -760,6 +762,12 @@ struct irq_chip_type {
* @reg_base: Register base address (virtual)
* @reg_readl: Alternate I/O accessor (defaults to readl if NULL)
* @reg_writel: Alternate I/O accessor (defaults to writel if NULL)
* @suspend: Function called from core code on suspend once per
* chip; can be useful instead of irq_chip::suspend to
* handle chip details even when no interrupts are in use
* @resume: Function called from core code on resume once per chip;
* can be useful instead of irq_chip::suspend to handle
* chip details even when no interrupts are in use
* @irq_base: Interrupt base nr for this chip
* @irq_cnt: Number of interrupts handled by this chip
* @mask_cache: Cached mask register shared between all chip types
@@ -786,6 +794,8 @@ struct irq_chip_generic {
void __iomem *reg_base;
u32 (*reg_readl)(void __iomem *addr);
void (*reg_writel)(u32 val, void __iomem *addr);
void (*suspend)(struct irq_chip_generic *gc);
void (*resume)(struct irq_chip_generic *gc);
unsigned int irq_base;
unsigned int irq_cnt;
u32 mask_cache;