[PATCH] gpio: omap: be more aggressive with pm_runtime
Felipe Balbi
balbi at ti.com
Wed Feb 8 08:26:54 EST 2012
try to keep gpio block suspended as much as possible.
Tested with pandaboard and a sysfs exported gpio.
Signed-off-by: Felipe Balbi <balbi at ti.com>
---
I couldn't see any issues with this patch. I managed to export
a gpio and change the direction with a while true loop with
no issues whatsoever.
Any chance someone tells me how to reproduce the original
wakeup problem we had ?
I wrote a simple script to dump gpio states while I had:
while true; do echo in > /sys/class/gpio/gpio2/direction; \
echo out > /sys/class/gpio/gpio2/direction; done &
running. Here's the ouput:
./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 11945
runtime_suspended_time 1214578
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1226468
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1226562
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1226578
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1226593
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 12234
runtime_suspended_time 1215257
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1227437
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1227531
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1227546
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1227562
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 12460
runtime_suspended_time 1215882
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1228289
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1228382
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1228398
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1228414
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 12734
runtime_suspended_time 1216453
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1229132
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1229226
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1229242
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1229257
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status active
runtime_active_time 13007
runtime_suspended_time 1216960
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1229914
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1230007
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1230023
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1230039
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 13234
runtime_suspended_time 1217492
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1230671
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1230765
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1230781
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1230796
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 13453
runtime_suspended_time 1218023
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1231421
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1231515
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1231531
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1231546
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 13703
runtime_suspended_time 1218539
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1232187
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1232281
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1232296
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1232312
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status active
runtime_active_time 13890
runtime_suspended_time 1219125
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1232960
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1233054
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1233070
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1233085
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 14109
runtime_suspended_time 1219601
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1233656
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1233750
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1233765
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1233781
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 14367
runtime_suspended_time 1220109
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1234421
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1234515
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1234531
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1234546
root at legolas:~# ./show_gpios.sh
omap_gpio.0
control auto
runtime_status suspended
runtime_active_time 14531
runtime_suspended_time 1220648
omap_gpio.1
control auto
runtime_status suspended
runtime_active_time 78
runtime_suspended_time 1235125
omap_gpio.2
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1235218
omap_gpio.3
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1235234
omap_gpio.4
control auto
runtime_status suspended
runtime_active_time 0
runtime_suspended_time 1235250
see that the active time changes for omap_gpio.0 (first gpio bank)
because I'm constantly changing direction of the exported gpio2, but
the other banks are kept in suspend state. I even managed to catch
the gpio bank while it was still in active state. Before suspending
again.
drivers/gpio/gpio-omap.c | 61 +++++++++++++++++++++++++++++++++-------------
1 files changed, 44 insertions(+), 17 deletions(-)
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 4273401..2dd9ced 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -537,12 +537,7 @@ static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
unsigned long flags;
- /*
- * If this is the first gpio_request for the bank,
- * enable the bank module.
- */
- if (!bank->mod_usage)
- pm_runtime_get_sync(bank->dev);
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
/* Set trigger to none. You need to enable the desired trigger with
@@ -572,6 +567,8 @@ static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
+
return 0;
}
@@ -581,6 +578,8 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
void __iomem *base = bank->base;
unsigned long flags;
+ pm_runtime_get_sync(bank->dev);
+
spin_lock_irqsave(&bank->lock, flags);
if (bank->regs->wkup_en) {
@@ -606,12 +605,7 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
_reset_gpio(bank, bank->chip.base + offset);
spin_unlock_irqrestore(&bank->lock, flags);
- /*
- * If this is the last gpio to be freed in the bank,
- * disable the bank module.
- */
- if (!bank->mod_usage)
- pm_runtime_put(bank->dev);
+ pm_runtime_put(bank->dev);
}
/*
@@ -707,9 +701,11 @@ static void gpio_irq_shutdown(struct irq_data *d)
struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
unsigned long flags;
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
_reset_gpio(bank, gpio);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
}
static void gpio_ack_irq(struct irq_data *d)
@@ -717,7 +713,9 @@ static void gpio_ack_irq(struct irq_data *d)
unsigned int gpio = d->irq - IH_GPIO_BASE;
struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
+ pm_runtime_get_sync(bank->dev);
_clear_gpio_irqstatus(bank, gpio);
+ pm_runtime_put(bank->dev);
}
static void gpio_mask_irq(struct irq_data *d)
@@ -726,10 +724,12 @@ static void gpio_mask_irq(struct irq_data *d)
struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
unsigned long flags;
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
_set_gpio_irqenable(bank, gpio, 0);
_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
}
static void gpio_unmask_irq(struct irq_data *d)
@@ -740,6 +740,7 @@ static void gpio_unmask_irq(struct irq_data *d)
u32 trigger = irqd_get_trigger_type(d);
unsigned long flags;
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
if (trigger)
_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
@@ -753,6 +754,7 @@ static void gpio_unmask_irq(struct irq_data *d)
_set_gpio_irqenable(bank, gpio, 1);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
}
static struct irq_chip gpio_irq_chip = {
@@ -836,17 +838,26 @@ static int gpio_input(struct gpio_chip *chip, unsigned offset)
unsigned long flags;
bank = container_of(chip, struct gpio_bank, chip);
+ pm_runtime_get_sync(bank->dev);
+
spin_lock_irqsave(&bank->lock, flags);
_set_gpio_direction(bank, offset, 1);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
+
return 0;
}
static int gpio_is_input(struct gpio_bank *bank, int mask)
{
void __iomem *reg = bank->base + bank->regs->direction;
+ u32 val;
- return __raw_readl(reg) & mask;
+ pm_runtime_get_sync(bank->dev);
+ val = __raw_readl(reg) & mask;
+ pm_runtime_put(bank->dev);
+
+ return val;
}
static int gpio_get(struct gpio_chip *chip, unsigned offset)
@@ -856,15 +867,20 @@ static int gpio_get(struct gpio_chip *chip, unsigned offset)
int gpio;
u32 mask;
+ int val;
gpio = chip->base + offset;
bank = container_of(chip, struct gpio_bank, chip);
reg = bank->base;
mask = GPIO_BIT(bank, gpio);
+ pm_runtime_get_sync(bank->dev);
if (gpio_is_input(bank, mask))
- return _get_gpio_datain(bank, gpio);
+ val = _get_gpio_datain(bank, gpio);
else
- return _get_gpio_dataout(bank, gpio);
+ val = _get_gpio_dataout(bank, gpio);
+ pm_runtime_put(bank->dev);
+
+ return val;
}
static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
@@ -873,10 +889,14 @@ static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
unsigned long flags;
bank = container_of(chip, struct gpio_bank, chip);
+
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
bank->set_dataout(bank, offset, value);
_set_gpio_direction(bank, offset, 0);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
+
return 0;
}
@@ -894,9 +914,11 @@ static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
dev_err(bank->dev, "Could not get gpio dbck\n");
}
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
_set_gpio_debounce(bank, offset, debounce);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
return 0;
}
@@ -907,9 +929,12 @@ static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
unsigned long flags;
bank = container_of(chip, struct gpio_bank, chip);
+
+ pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
bank->set_dataout(bank, offset, value);
spin_unlock_irqrestore(&bank->lock, flags);
+ pm_runtime_put(bank->dev);
}
static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
@@ -1330,7 +1355,8 @@ void omap2_gpio_prepare_for_idle(int pwr_mode)
bank->power_mode = pwr_mode;
- pm_runtime_put_sync_suspend(bank->dev);
+ if (!pm_runtime_suspended(bank->dev))
+ pm_runtime_suspend(bank->dev);
}
}
@@ -1342,7 +1368,8 @@ void omap2_gpio_resume_after_idle(void)
if (!bank->mod_usage || !bank->loses_context)
continue;
- pm_runtime_get_sync(bank->dev);
+ if (pm_runtime_suspended(bank->dev))
+ pm_runtime_resume(bank->dev);
}
}
--
1.7.9
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