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authorJon Hunter <jonathanh@nvidia.com>2016-06-07 16:12:29 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2016-06-13 11:53:51 +0100
commitbe45beb2df6909d42a6b3b0052601b3eef878fc0 (patch)
treeec2e157704e95b7d78cffc5be6026b6f7f022a7d /kernel/irq/chip.c
parent1e2a7d78499ec8859d2b469051b7b80bad3b08aa (diff)
downloadlinux-be45beb2df6909d42a6b3b0052601b3eef878fc0.tar.bz2
genirq: Add runtime power management support for IRQ chips
Some IRQ chips may be located in a power domain outside of the CPU subsystem and hence will require device specific runtime power management. In order to support such IRQ chips, add a pointer for a device structure to the irq_chip structure, and if this pointer is populated by the IRQ chip driver and CONFIG_PM is selected in the kernel configuration, then the pm_runtime_get/put APIs for this chip will be called when an IRQ is requested/freed, respectively. Reviewed-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'kernel/irq/chip.c')
-rw-r--r--kernel/irq/chip.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2f9f2b0e79f2..ad8131473774 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1093,3 +1093,43 @@ int irq_chip_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
return 0;
}
+
+/**
+ * irq_chip_pm_get - Enable power for an IRQ chip
+ * @data: Pointer to interrupt specific data
+ *
+ * Enable the power to the IRQ chip referenced by the interrupt data
+ * structure.
+ */
+int irq_chip_pm_get(struct irq_data *data)
+{
+ int retval;
+
+ if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device) {
+ retval = pm_runtime_get_sync(data->chip->parent_device);
+ if (retval < 0) {
+ pm_runtime_put_noidle(data->chip->parent_device);
+ return retval;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * irq_chip_pm_put - Disable power for an IRQ chip
+ * @data: Pointer to interrupt specific data
+ *
+ * Disable the power to the IRQ chip referenced by the interrupt data
+ * structure, belongs. Note that power will only be disabled, once this
+ * function has been called for all IRQs that have called irq_chip_pm_get().
+ */
+int irq_chip_pm_put(struct irq_data *data)
+{
+ int retval = 0;
+
+ if (IS_ENABLED(CONFIG_PM) && data->chip->parent_device)
+ retval = pm_runtime_put(data->chip->parent_device);
+
+ return (retval < 0) ? retval : 0;
+}