* Tony Lindgren <t...@atomide.com> [150319 16:08]:
> * Tony Lindgren <t...@atomide.com> [150307 00:08]:
> > * grygorii.stras...@linaro.org <grygorii.stras...@linaro.org> [150306
> > 11:27]:
> > > From: Grygorii Strashko <grygorii.stras...@linaro.org>
> > >
> > > Now there are two points related to Runtime PM usage:
> > > 1) bank state doesn't need to be checked in places where
> > > Rintime PM is used, bacause Runtime PM maintains its
> > > own usage counter:
> > > if (!BANK_USED(bank))
> > > pm_runtime_get_sync(bank->dev);
> > > so, it's safe to drop such checks.
> > >
> > > 2) There is a call of pm_runtime_get_sync() in omap_gpio_irq_type(),
> > > but no corresponding put. As result, GPIO devices could be
> > > powered on forever if at least one GPIO was used as IRQ.
> > > Hence, allow powering off GPIO banks by adding missed
> > > pm_runtime_put(bank->dev) at the end of omap_gpio_irq_type().
> >
> > Nice to see this happening, but I think before merging this we need
> > to test to be sure that the pm_runtime calls actually match.. I'm
> > not convinced right now.. We may still have uninitialized entry
> > points similar to 3d009c8c61f9 ("gpio: omap: Fix bad device
> > access with setup_irq()").
>
> OK so I finally got around testing this along with your bank
> removal set. Looks like this patch causes a regression at least
> with n900 keyboard LEDs with off-idle. The LED won't come back
> on after restore from off-idle. Anyways, now we have something
> reproducable :) So I'll try to debug it further at some point,
> might be few days before I get to it.
Sorry for the delay, finally got around to this one :)
Here's what I came up with, only lightly tested so far. Note that
we need to keep the PM runtime per bank, not per GPIO. Will repost
a proper patch after some more testing.
This should not cause any functional changes, mostly just removal
of code that can all be done in omap_enable/disable_gpio_module.
Regards,
Tony
8< -------------------------
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -86,6 +86,7 @@ struct gpio_bank {
#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
#define LINE_USED(line, offset) (line & (BIT(offset)))
+static void omap_reset_gpio(struct gpio_bank *bank, unsigned offset);
static void omap_gpio_unmask_irq(struct irq_data *d);
static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
@@ -419,8 +420,16 @@ static int omap_set_gpio_triggering(struct gpio_bank
*bank, int gpio,
return 0;
}
-static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset)
+static void omap_enable_gpio_module(struct gpio_bank *bank, unsigned offset,
+ bool is_irq)
{
+ unsigned long flags;
+
+ /* PM runtime is per bank, not per GPIO line */
+ if (!BANK_USED(bank))
+ pm_runtime_get_sync(bank->dev);
+
+ spin_lock_irqsave(&bank->lock, flags);
if (bank->regs->pinctrl) {
void __iomem *reg = bank->base + bank->regs->pinctrl;
@@ -438,11 +447,30 @@ static void omap_enable_gpio_module(struct gpio_bank
*bank, unsigned offset)
writel_relaxed(ctrl, reg);
bank->context.ctrl = ctrl;
}
+
+ if (is_irq) {
+ omap_set_gpio_direction(bank, offset, 1);
+ bank->irq_usage |= BIT(offset);
+ } else {
+ omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
+ bank->mod_usage |= BIT(offset);
+ }
+ spin_unlock_irqrestore(&bank->lock, flags);
}
-static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset)
+static void omap_disable_gpio_module(struct gpio_bank *bank, unsigned offset,
+ bool is_irq)
{
void __iomem *base = bank->base;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bank->lock, flags);
+ if (is_irq)
+ bank->irq_usage &= ~(BIT(offset));
+ else
+ bank->mod_usage &= ~(BIT(offset));
+
+ omap_reset_gpio(bank, offset);
if (bank->regs->wkup_en &&
!LINE_USED(bank->mod_usage, offset) &&
@@ -463,6 +491,11 @@ static void omap_disable_gpio_module(struct gpio_bank
*bank, unsigned offset)
writel_relaxed(ctrl, reg);
bank->context.ctrl = ctrl;
}
+ spin_unlock_irqrestore(&bank->lock, flags);
+
+ /* PM runtime is per bank, not per GPIO line */
+ if (!BANK_USED(bank))
+ pm_runtime_put(bank->dev);
}
static int omap_gpio_is_input(struct gpio_bank *bank, unsigned offset)
@@ -472,15 +505,6 @@ static int omap_gpio_is_input(struct gpio_bank *bank,
unsigned offset)
return readl_relaxed(reg) & BIT(offset);
}
-static void omap_gpio_init_irq(struct gpio_bank *bank, unsigned offset)
-{
- if (!LINE_USED(bank->mod_usage, offset)) {
- omap_enable_gpio_module(bank, offset);
- omap_set_gpio_direction(bank, offset, 1);
- }
- bank->irq_usage |= BIT(offset);
-}
-
static int omap_gpio_irq_type(struct irq_data *d, unsigned type)
{
struct gpio_bank *bank = omap_irq_data_get_bank(d);
@@ -488,9 +512,6 @@ static int omap_gpio_irq_type(struct irq_data *d, unsigned
type)
unsigned long flags;
unsigned offset = d->hwirq;
- if (!BANK_USED(bank))
- pm_runtime_get_sync(bank->dev);
-
if (type & ~IRQ_TYPE_SENSE_MASK)
return -EINVAL;
@@ -498,13 +519,9 @@ static int omap_gpio_irq_type(struct irq_data *d, unsigned
type)
(type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
return -EINVAL;
+ omap_enable_gpio_module(bank, offset, true);
spin_lock_irqsave(&bank->lock, flags);
retval = omap_set_gpio_triggering(bank, offset, type);
- omap_gpio_init_irq(bank, offset);
- if (!omap_gpio_is_input(bank, offset)) {
- spin_unlock_irqrestore(&bank->lock, flags);
- return -EINVAL;
- }
spin_unlock_irqrestore(&bank->lock, flags);
if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
@@ -659,26 +676,8 @@ static int omap_gpio_wake_enable(struct irq_data *d,
unsigned int enable)
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_USED(bank))
- pm_runtime_get_sync(bank->dev);
-
- spin_lock_irqsave(&bank->lock, flags);
- /* Set trigger to none. You need to enable the desired trigger with
- * request_irq() or set_irq_type(). Only do this if the IRQ line has
- * not already been requested.
- */
- if (!LINE_USED(bank->irq_usage, offset)) {
- omap_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);
- omap_enable_gpio_module(bank, offset);
- }
- bank->mod_usage |= BIT(offset);
- spin_unlock_irqrestore(&bank->lock, flags);
+ omap_enable_gpio_module(bank, offset, false);
return 0;
}
@@ -686,20 +685,8 @@ static int omap_gpio_request(struct gpio_chip *chip,
unsigned offset)
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;
-
- spin_lock_irqsave(&bank->lock, flags);
- bank->mod_usage &= ~(BIT(offset));
- omap_disable_gpio_module(bank, offset);
- omap_reset_gpio(bank, 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_USED(bank))
- pm_runtime_put(bank->dev);
+ omap_disable_gpio_module(bank, offset, false);
}
/*
@@ -788,15 +775,9 @@ exit:
static unsigned int omap_gpio_irq_startup(struct irq_data *d)
{
struct gpio_bank *bank = omap_irq_data_get_bank(d);
- unsigned long flags;
unsigned offset = d->hwirq;
- if (!BANK_USED(bank))
- pm_runtime_get_sync(bank->dev);
-
- spin_lock_irqsave(&bank->lock, flags);
- omap_gpio_init_irq(bank, offset);
- spin_unlock_irqrestore(&bank->lock, flags);
+ omap_enable_gpio_module(bank, offset, true);
omap_gpio_unmask_irq(d);
return 0;
@@ -805,21 +786,9 @@ static unsigned int omap_gpio_irq_startup(struct irq_data
*d)
static void omap_gpio_irq_shutdown(struct irq_data *d)
{
struct gpio_bank *bank = omap_irq_data_get_bank(d);
- unsigned long flags;
unsigned offset = d->hwirq;
- spin_lock_irqsave(&bank->lock, flags);
- bank->irq_usage &= ~(BIT(offset));
- omap_disable_gpio_module(bank, offset);
- omap_reset_gpio(bank, offset);
- spin_unlock_irqrestore(&bank->lock, flags);
-
- /*
- * If this is the last IRQ to be freed in the bank,
- * disable the bank module.
- */
- if (!BANK_USED(bank))
- pm_runtime_put(bank->dev);
+ omap_disable_gpio_module(bank, offset, true);
}
static void omap_gpio_ack_irq(struct irq_data *d)
--
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