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authorDoug Anderson <dianders@chromium.org>2014-11-19 14:51:32 -0800
committerLinus Walleij <linus.walleij@linaro.org>2014-12-30 13:17:27 +0100
commit68bda47c57c9d671820672badc1cb62211ec4700 (patch)
tree48a76781459d12ee9f6038c1eedf94409058ecf6 /drivers/pinctrl
parentb7392d2247cfe6771f95d256374f1a8e6a6f48d6 (diff)
downloadkernel-68bda47c57c9d671820672badc1cb62211ec4700.tar.gz
pinctrl: rockchip: Handle wakeup pins
The rockchip pinctrl driver was using irq_gc_set_wake() as its implementation of irq_set_wake() but was totally ignoring everything that irq_gc_set_wake() did (which is to upkeep gc->wake_active). Let's fix that by setting gc->wake_active as GPIO_INTEN at suspend time and restoring GPIO_INTEN at resume time. NOTE a few quirks when thinking about this patch: - Rockchip pinctrl hardware supports both "disable/enable" and "mask/unmask". Right now we only use "disable/enable" and present those to Linux as "mask/unmask". This should be OK because enable/disable is optional and Linux will implement it in terms of mask/unmask. At the moment we always tell hardware all interrupts are unmasked (the boot default). - At suspend time Linux tries to call "disable" on all interrupts and also enables wakeup on all wakeup interrupts. One would think that since "disable" is implemented as "mask" when "disable" isn't provided and that since we were ignoring gc->wake_active that nothing would have woken us up. That's not the case since Linux "optimizes" things and just leaves interrutps unmasked, assuming it could mask them later when they go off. That meant that at suspend time all interrupts were actually being left enabled. With this patch random non-wakeup interrupts no longer wake the system up. Wakeup interrupts still wake the system up. Signed-off-by: Doug Anderson <dianders@chromium.org> Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/pinctrl-rockchip.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index ba74f0aa60c7..e91e8453aa78 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -89,6 +89,7 @@ struct rockchip_iomux {
* @reg_pull: optional separate register for additional pull settings
* @clk: clock of the gpio bank
* @irq: interrupt of the gpio bank
+ * @saved_enables: Saved content of GPIO_INTEN at suspend time.
* @pin_base: first pin number
* @nr_pins: number of pins in this bank
* @name: name of the bank
@@ -107,6 +108,7 @@ struct rockchip_pin_bank {
struct regmap *regmap_pull;
struct clk *clk;
int irq;
+ u32 saved_enables;
u32 pin_base;
u8 nr_pins;
char *name;
@@ -1543,6 +1545,23 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
return 0;
}
+static void rockchip_irq_suspend(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct rockchip_pin_bank *bank = gc->private;
+
+ bank->saved_enables = irq_reg_readl(gc, GPIO_INTEN);
+ irq_reg_writel(gc, gc->wake_active, GPIO_INTEN);
+}
+
+static void rockchip_irq_resume(struct irq_data *d)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct rockchip_pin_bank *bank = gc->private;
+
+ irq_reg_writel(gc, bank->saved_enables, GPIO_INTEN);
+}
+
static int rockchip_interrupts_register(struct platform_device *pdev,
struct rockchip_pinctrl *info)
{
@@ -1587,6 +1606,8 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
+ gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
+ gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;
gc->chip_types[0].chip.irq_set_type = rockchip_irq_set_type;
gc->wake_enabled = IRQ_MSK(bank->nr_pins);