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authorGeert Uytterhoeven <geert+renesas@glider.be>2015-02-05 18:49:09 +0300
committerLinus Walleij <linus.walleij@linaro.org>2015-03-04 15:50:46 +0300
commitb80eef95beb04760629822fa130aeed54cdfafca (patch)
tree5f85930eeef54094193cebd575640b42aeb2d621 /drivers/gpio/gpio-pcf857x.c
parenta39294bdf4b03803156c771968a6e2ba6ebb505b (diff)
downloadlinux-b80eef95beb04760629822fa130aeed54cdfafca.tar.xz
gpio: pcf857x: Propagate wake-up setting to parent irq controller
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>
Diffstat (limited to 'drivers/gpio/gpio-pcf857x.c')
-rw-r--r--drivers/gpio/gpio-pcf857x.c37
1 files changed, 34 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 126c93732101..945f0cda8529 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -204,6 +204,36 @@ static irqreturn_t pcf857x_irq(int irq, void *data)
return IRQ_HANDLED;
}
+/*
+ * 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,
@@ -317,8 +347,9 @@ static int pcf857x_probe(struct i2c_client *client,
/* 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;
@@ -331,7 +362,7 @@ static int pcf857x_probe(struct i2c_client *client,
if (status)
goto fail_irq;
- gpiochip_set_chained_irqchip(&gpio->chip, &dummy_irq_chip,
+ gpiochip_set_chained_irqchip(&gpio->chip, &pcf857x_irq_chip,
client->irq, NULL);
}