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Date: Sat, 7 Dec 2013 22:40:38 -0600
From: Chao Xu <caesarxuchao@...il.com>
To: linux-omap@...r.kernel.org
Cc: santosh.shilimkar@...com, khilman@...prootsystems.com,
linus.walleij@...aro.org, linux-gpio@...r.kernel.org,
linux-kernel@...r.kernel.org, tony@...mide.com, balbi@...com,
khilman@...aro.org, nm@...com, Chao Xu <caesarxuchao@...il.com>
Subject: [RFC/RFT/PATCH V3] gpio: omap: refresh patch "be more aggressive with pm_runtime" against v3.12-rc5
From: Felipe Balbi <balbi@...com>
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>
[caesarxuchao@...il.com : Refreshed against v3.12-rc5, and added
revision check to enable aggressive pm_runtime on OMAP4-only. Because
am33xx_gpio_sysc.idlemodes seems to be wrongly marked as
SIDLE_SMART_WKUP, which might cause missed interrupts with this patch.
Tested on Pandaboard rev A2.]
Signed-off-by: Chao Xu <caesarxuchao@...il.com>
---
changes since v2:
*add wrapper function to avoid 'is_aggressive_pm' check everywhere, as
suggested by Santosh Shilimkar
*fix format issue in commit log
drivers/gpio/gpio-omap.c | 90 +++++++++++++++++++++++++------
include/linux/platform_data/gpio-omap.h | 1 +
2 files changed, 74 insertions(+), 17 deletions(-)
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 89675f8..fc5318b 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -76,6 +76,7 @@ struct gpio_bank {
int context_loss_count;
int power_mode;
bool workaround_enabled;
+ bool is_aggressive_pm;
void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable);
int (*get_context_loss_count)(struct device *dev);
@@ -90,6 +91,18 @@ struct gpio_bank {
#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
#define LINE_USED(line, offset) (line & (1 << offset))
+static void _aggressive_pm_runtime_get_sync(struct gpio_bank *bank)
+{
+ if (bank->is_aggressive_pm)
+ pm_runtime_get_sync(bank->dev);
+}
+
+static void _aggressive_pm_runtime_put(struct gpio_bank *bank)
+{
+ if (bank->is_aggressive_pm)
+ pm_runtime_put(bank->dev);
+}
+
static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
{
return bank->chip.base + gpio_irq;
@@ -473,8 +486,13 @@ static void _disable_gpio_module(struct gpio_bank *bank, unsigned offset)
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;
+ _aggressive_pm_runtime_get_sync(bank);
+ val = __raw_readl(reg) & mask;
+ _aggressive_pm_runtime_put(bank);
+
+ return val;
}
static int gpio_irq_type(struct irq_data *d, unsigned type)
@@ -485,7 +503,7 @@ static int gpio_irq_type(struct irq_data *d, unsigned type)
unsigned long flags;
unsigned offset;
- if (!BANK_USED(bank))
+ if (!BANK_USED(bank) && !bank->is_aggressive_pm)
pm_runtime_get_sync(bank->dev);
#ifdef CONFIG_ARCH_OMAP1
@@ -503,6 +521,7 @@ static int gpio_irq_type(struct irq_data *d, unsigned type)
(type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
return -EINVAL;
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
offset = GPIO_INDEX(bank, gpio);
retval = _set_gpio_triggering(bank, offset, type);
@@ -511,11 +530,13 @@ static int gpio_irq_type(struct irq_data *d, unsigned type)
_set_gpio_direction(bank, offset, 1);
} else if (!gpio_is_input(bank, 1 << offset)) {
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
return -EINVAL;
}
bank->irq_usage |= 1 << GPIO_INDEX(bank, gpio);
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
__irq_set_handler_locked(d->irq, handle_level_irq);
@@ -668,10 +689,11 @@ static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
unsigned long flags;
/*
- * If this is the first gpio_request for the bank,
- * enable the bank module.
+ * if aggressive runtime pm is supported, enable the bank module
+ * for each gpio_request. Otherwise enable the bank module if this
+ * is the first gpio_request for the bank.
*/
- if (!BANK_USED(bank))
+ if (bank->is_aggressive_pm || !BANK_USED(bank))
pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
@@ -685,7 +707,7 @@ static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
}
bank->mod_usage |= 1 << offset;
spin_unlock_irqrestore(&bank->lock, flags);
-
+ _aggressive_pm_runtime_put(bank);
return 0;
}
@@ -694,6 +716,8 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
unsigned long flags;
+ _aggressive_pm_runtime_get_sync(bank);
+
spin_lock_irqsave(&bank->lock, flags);
bank->mod_usage &= ~(1 << offset);
_disable_gpio_module(bank, offset);
@@ -701,10 +725,11 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
spin_unlock_irqrestore(&bank->lock, flags);
/*
- * If this is the last gpio to be freed in the bank,
- * disable the bank module.
+ * if aggressive runtime pm is supported, disable the bank module
+ * for each gpio_free. Otherwise disable the bank module if this
+ * is the last gpio to be freed in the bank.
*/
- if (!BANK_USED(bank))
+ if (bank->is_aggressive_pm || !BANK_USED(bank))
pm_runtime_put(bank->dev);
}
@@ -796,17 +821,18 @@ static void gpio_irq_shutdown(struct irq_data *d)
unsigned long flags;
unsigned offset = GPIO_INDEX(bank, gpio);
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
bank->irq_usage &= ~(1 << offset);
_disable_gpio_module(bank, offset);
_reset_gpio(bank, gpio);
spin_unlock_irqrestore(&bank->lock, flags);
-
/*
- * If this is the last IRQ to be freed in the bank,
- * disable the bank module.
+ * if aggressive runtime pm is supported, disable the bank module
+ * for each irq_shutdown. Otherwise disable the bank module if this
+ * is the last IRQ to be freed in the bank.
*/
- if (!BANK_USED(bank))
+ if (bank->is_aggressive_pm || !BANK_USED(bank))
pm_runtime_put(bank->dev);
}
@@ -815,7 +841,9 @@ static void gpio_ack_irq(struct irq_data *d)
struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
unsigned int gpio = irq_to_gpio(bank, d->hwirq);
+ _aggressive_pm_runtime_get_sync(bank);
_clear_gpio_irqstatus(bank, gpio);
+ _aggressive_pm_runtime_put(bank);
}
static void gpio_mask_irq(struct irq_data *d)
@@ -824,10 +852,12 @@ static void gpio_mask_irq(struct irq_data *d)
unsigned int gpio = irq_to_gpio(bank, d->hwirq);
unsigned long flags;
+ _aggressive_pm_runtime_get_sync(bank);
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);
+ _aggressive_pm_runtime_put(bank);
}
static void gpio_unmask_irq(struct irq_data *d)
@@ -838,6 +868,7 @@ static void gpio_unmask_irq(struct irq_data *d)
u32 trigger = irqd_get_trigger_type(d);
unsigned long flags;
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
if (trigger)
_set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
@@ -851,6 +882,7 @@ static void gpio_unmask_irq(struct irq_data *d)
_set_gpio_irqenable(bank, gpio, 1);
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
}
static struct irq_chip gpio_irq_chip = {
@@ -933,9 +965,13 @@ static int gpio_input(struct gpio_chip *chip, unsigned offset)
unsigned long flags;
bank = container_of(chip, struct gpio_bank, chip);
+
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
_set_gpio_direction(bank, offset, 1);
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
+
return 0;
}
@@ -944,13 +980,18 @@ static int gpio_get(struct gpio_chip *chip, unsigned offset)
struct gpio_bank *bank;
u32 mask;
+ int val;
bank = container_of(chip, struct gpio_bank, chip);
mask = (1 << offset);
+ _aggressive_pm_runtime_get_sync(bank);
if (gpio_is_input(bank, mask))
- return _get_gpio_datain(bank, offset);
+ val = _get_gpio_datain(bank, offset);
else
- return _get_gpio_dataout(bank, offset);
+ val = _get_gpio_dataout(bank, offset);
+ _aggressive_pm_runtime_put(bank);
+
+ return val;
}
static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
@@ -960,6 +1001,8 @@ static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
int retval = 0;
bank = container_of(chip, struct gpio_bank, chip);
+
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
if (LINE_USED(bank->irq_usage, offset)) {
@@ -972,6 +1015,8 @@ static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
exit:
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
+
return retval;
}
@@ -983,9 +1028,11 @@ static int gpio_debounce(struct gpio_chip *chip, unsigned offset,
bank = container_of(chip, struct gpio_bank, chip);
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
_set_gpio_debounce(bank, offset, debounce);
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
return 0;
}
@@ -996,9 +1043,12 @@ static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
unsigned long flags;
bank = container_of(chip, struct gpio_bank, chip);
+
+ _aggressive_pm_runtime_get_sync(bank);
spin_lock_irqsave(&bank->lock, flags);
bank->set_dataout(bank, offset, value);
spin_unlock_irqrestore(&bank->lock, flags);
+ _aggressive_pm_runtime_put(bank);
}
/*---------------------------------------------------------------------*/
@@ -1168,6 +1218,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
bank->is_mpuio = pdata->is_mpuio;
bank->non_wakeup_gpios = pdata->non_wakeup_gpios;
bank->regs = pdata->regs;
+ bank->is_aggressive_pm = pdata->is_aggressive_pm;
#ifdef CONFIG_OF_GPIO
bank->chip.of_node = of_node_get(node);
#endif
@@ -1449,7 +1500,8 @@ 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);
}
}
@@ -1461,7 +1513,8 @@ void omap2_gpio_resume_after_idle(void)
if (!BANK_USED(bank) || !bank->loses_context)
continue;
- pm_runtime_get_sync(bank->dev);
+ if (pm_runtime_suspended(bank->dev))
+ pm_runtime_resume(bank->dev);
}
}
@@ -1585,18 +1638,21 @@ static const struct omap_gpio_platform_data omap2_pdata = {
.regs = &omap2_gpio_regs,
.bank_width = 32,
.dbck_flag = false,
+ .is_aggressive_pm = false,
};
static const struct omap_gpio_platform_data omap3_pdata = {
.regs = &omap2_gpio_regs,
.bank_width = 32,
.dbck_flag = true,
+ .is_aggressive_pm = false,
};
static const struct omap_gpio_platform_data omap4_pdata = {
.regs = &omap4_gpio_regs,
.bank_width = 32,
.dbck_flag = true,
+ .is_aggressive_pm = true,
};
static const struct of_device_id omap_gpio_match[] = {
diff --git a/include/linux/platform_data/gpio-omap.h b/include/linux/platform_data/gpio-omap.h
index 5d50b25..bb033b1 100644
--- a/include/linux/platform_data/gpio-omap.h
+++ b/include/linux/platform_data/gpio-omap.h
@@ -200,6 +200,7 @@ struct omap_gpio_platform_data {
bool dbck_flag; /* dbck required or not - True for OMAP3&4 */
bool loses_context; /* whether the bank would ever lose context */
bool is_mpuio; /* whether the bank is of type MPUIO */
+ bool is_aggressive_pm; /* whether aggressive runtime pm is supported*/
u32 non_wakeup_gpios;
struct omap_gpio_reg_offs *regs;
--
1.7.9.5
--
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