The pcf857x GPIO and interrupt controller uses dummy_irq_chip, which
does not implement irq_chip.irq_set_wake() and does not set
IRQCHIP_SKIP_SET_WAKE.
This causes two s2ram issues if wake-up is enabled for the pcf857x GPIO
pins:
1. During resume from s2ram, the following warning is printed:
WARNING: CPU: 0 PID: 1046 at kernel/irq/manage.c:537 irq_set_irq_wake+0x9c/0xf8()
Unbalanced IRQ 113 wake disable
2. Wake-up through the pcf857x GPIO pins may fail, as the parent
interrupt controller may be suspended.
Migrate the pcf857x GPIO and interrupt controller from dummy_irq_chip to
its own irq_chip. This irq chip implements irq_chip.irq_set_wake() to
propagate its wake-up setting to the parent interrupt controller.
This fixes wake-up through gpio-keys on sh73a0/kzm9g, where the pcf857x
interrupt is cascaded to irq-renesas-intc-irqpin, and the latter must
not be suspended when wake-up is enabled.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
+/*
+ * NOP functions
+ */
+static void noop(struct irq_data *data) { }
+
+static unsigned int noop_ret(struct irq_data *data)
+{
+ return 0;
+}
+
+static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on)
+{
+ struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
+
+ irq_set_irq_wake(gpio->client->irq, on);
+ return 0;
+}
+
+static struct irq_chip pcf857x_irq_chip = {
+ .name = "pcf857x",
+ .irq_startup = noop_ret,
+ .irq_shutdown = noop,
+ .irq_enable = noop,
+ .irq_disable = noop,
+ .irq_ack = noop,
+ .irq_mask = noop,
+ .irq_unmask = noop,
+ .irq_set_wake = pcf857x_irq_set_wake,
+};
+
/*-------------------------------------------------------------------------*/
static int pcf857x_probe(struct i2c_client *client,
/*-------------------------------------------------------------------------*/
static int pcf857x_probe(struct i2c_client *client,
/* Enable irqchip if we have an interrupt */
if (client->irq) {
/* Enable irqchip if we have an interrupt */
if (client->irq) {
- status = gpiochip_irqchip_add(&gpio->chip, &dummy_irq_chip, 0,
- handle_level_irq, IRQ_TYPE_NONE);
+ status = gpiochip_irqchip_add(&gpio->chip, &pcf857x_irq_chip,
+ 0, handle_level_irq,
+ IRQ_TYPE_NONE);
if (status) {
dev_err(&client->dev, "cannot add irqchip\n");
goto fail_irq;
if (status) {
dev_err(&client->dev, "cannot add irqchip\n");
goto fail_irq;
if (status)
goto fail_irq;
if (status)
goto fail_irq;
- gpiochip_set_chained_irqchip(&gpio->chip, &dummy_irq_chip,
+ gpiochip_set_chained_irqchip(&gpio->chip, &pcf857x_irq_chip,