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GPIO fixes for v4.20:

Browse Source 
- ACPI IRQ request deferral
 - OMAP: revert deferred wakeup quirk
 - MAX7301: fix DMA safe memory handling
 - MVEBU: selective probe failure on missing clk
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Merge tag 'gpio-v4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:
 "Hopefully last round of GPIO fixes.

  The ACPI patch is pretty important for some laptop users, the rest is
  driver-specific for embedded (mostly ARM) systems.

  I took out one ACPI patch that wasn't critical enough because I
  couldn't justify sending it at this point, and that is why the commit
  date is today, but the patches have been in linux-next.

  Sorry for not sending some of them earlier :(

  Notice that we have a co-maintainer for GPIO now, Bartosz Golaszewski,
  and he might jump in and make some pull requests at times when I am
  off.

  Summary:

   - ACPI IRQ request deferral

   - OMAP: revert deferred wakeup quirk

   - MAX7301: fix DMA safe memory handling

   - MVEBU: selective probe failure on missing clk"

* tag 'gpio-v4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: mvebu: only fail on missing clk if pwm is actually to be used
  gpio: max7301: fix driver for use with CONFIG_VMAP_STACK
  gpio: gpio-omap: Revert deferred wakeup quirk handling for regressions
  gpiolib-acpi: Only defer request_irq for GpioInt ACPI event handlers
This commit is contained in:
Linus Torvalds 2018-12-21 09:05:28 -08:00
commit bc380733a5
4 changed files with 105 additions and 141 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpio/gpio-max7301.c
View File

@ -25,7 +25,7 @@ static int max7301_spi_write(struct device *dev, unsigned int reg,
struct spi_device *spi = to_spi_device(dev);
u16 word = ((reg & 0x7F) << 8) | (val & 0xFF);
return spi_write(spi, (const u8 *)&word, sizeof(word));
return spi_write_then_read(spi, &word, sizeof(word), NULL, 0);
}
/* A read from the MAX7301 means two transfers; here, one message each */
@ -37,14 +37,8 @@ static int max7301_spi_read(struct device *dev, unsigned int reg)
struct spi_device *spi = to_spi_device(dev);
word = 0x8000 | (reg << 8);
ret = spi_write(spi, (const u8 *)&word, sizeof(word));
if (ret)
return ret;
/*
* This relies on the fact, that a transfer with NULL tx_buf shifts out
* zero bytes (=NOOP for MAX7301)
*/
ret = spi_read(spi, (u8 *)&word, sizeof(word));
ret = spi_write_then_read(spi, &word, sizeof(word), &word,
sizeof(word));
if (ret)
return ret;
return word & 0xff;

6
drivers/gpio/gpio-mvebu.c
View File

@ -773,9 +773,6 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
"marvell,armada-370-gpio"))
return 0;
if (IS_ERR(mvchip->clk))
return PTR_ERR(mvchip->clk);
/*
* There are only two sets of PWM configuration registers for
* all the GPIO lines on those SoCs which this driver reserves
@ -786,6 +783,9 @@ static int mvebu_pwm_probe(struct platform_device *pdev,
if (!res)
return 0;
if (IS_ERR(mvchip->clk))
return PTR_ERR(mvchip->clk);
/*
* Use set A for lines of GPIO chip with id 0, B for GPIO chip
* with id 1. Don't allow further GPIO chips to be used for PWM.

64
drivers/gpio/gpio-omap.c
View File

@ -32,7 +32,6 @@
#define OMAP4_GPIO_DEBOUNCINGTIME_MASK 0xFF
#define OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER BIT(2)
#define OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN BIT(1)
struct gpio_regs {
u32 irqenable1;
@ -379,18 +378,9 @@ static inline void omap_set_gpio_trigger(struct gpio_bank *bank, int gpio,
readl_relaxed(bank->base + bank->regs->fallingdetect);
if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
/* Defer wkup_en register update until we idle? */
if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) {
if (trigger)
bank->context.wake_en |= gpio_bit;
else
bank->context.wake_en &= ~gpio_bit;
} else {
omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit,
trigger != 0);
bank->context.wake_en =
readl_relaxed(bank->base + bank->regs->wkup_en);
}
omap_gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0);
bank->context.wake_en =
readl_relaxed(bank->base + bank->regs->wkup_en);
}
/* This part needs to be executed always for OMAP{34xx, 44xx} */
@ -942,44 +932,6 @@ omap2_gpio_disable_level_quirk(struct gpio_bank *bank)
bank->base + bank->regs->risingdetect);
}
/*
* On omap4 and later SoC variants a level interrupt with wkup_en
* enabled blocks the GPIO functional clock from idling until the GPIO
* instance has been reset. To avoid that, we must set wkup_en only for
* idle for level interrupts, and clear level registers for the duration
* of idle. The level interrupts will be still there on wakeup by their
* nature.
*/
static void __maybe_unused
omap4_gpio_enable_level_quirk(struct gpio_bank *bank)
{
/* Update wake register for idle, edge bits might be already set */
writel_relaxed(bank->context.wake_en,
bank->base + bank->regs->wkup_en);
/* Clear level registers for idle */
writel_relaxed(0, bank->base + bank->regs->leveldetect0);
writel_relaxed(0, bank->base + bank->regs->leveldetect1);
}
static void __maybe_unused
omap4_gpio_disable_level_quirk(struct gpio_bank *bank)
{
/* Restore level registers after idle */
writel_relaxed(bank->context.leveldetect0,
bank->base + bank->regs->leveldetect0);
writel_relaxed(bank->context.leveldetect1,
bank->base + bank->regs->leveldetect1);
/* Clear saved wkup_en for level, it will be set for next idle again */
bank->context.wake_en &= ~(bank->context.leveldetect0 |
bank->context.leveldetect1);
/* Update wake with only edge configuration */
writel_relaxed(bank->context.wake_en,
bank->base + bank->regs->wkup_en);
}
/*---------------------------------------------------------------------*/
static int omap_mpuio_suspend_noirq(struct device *dev)
@ -1412,12 +1364,7 @@ static int omap_gpio_probe(struct platform_device *pdev)
omap_set_gpio_dataout_mask_multiple;
}
if (bank->quirks & OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN) {
bank->funcs.idle_enable_level_quirk =
omap4_gpio_enable_level_quirk;
bank->funcs.idle_disable_level_quirk =
omap4_gpio_disable_level_quirk;
} else if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) {
if (bank->quirks & OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER) {
bank->funcs.idle_enable_level_quirk =
omap2_gpio_enable_level_quirk;
bank->funcs.idle_disable_level_quirk =
@ -1806,8 +1753,7 @@ static const struct omap_gpio_platform_data omap4_pdata = {
.regs = &omap4_gpio_regs,
.bank_width = 32,
.dbck_flag = true,
.quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER |
OMAP_GPIO_QUIRK_DEFERRED_WKUP_EN,
.quirks = OMAP_GPIO_QUIRK_IDLE_REMOVE_TRIGGER,
};
static const struct of_device_id omap_gpio_match[] = {

164
drivers/gpio/gpiolib-acpi.c
View File

@ -19,11 +19,28 @@
#include "gpiolib.h"
/**
* struct acpi_gpio_event - ACPI GPIO event handler data
*
* @node: list-entry of the events list of the struct acpi_gpio_chip
* @handle: handle of ACPI method to execute when the IRQ triggers
* @handler: irq_handler to pass to request_irq when requesting the IRQ
* @pin: GPIO pin number on the gpio_chip
* @irq: Linux IRQ number for the event, for request_ / free_irq
* @irqflags: flags to pass to request_irq when requesting the IRQ
* @irq_is_wake: If the ACPI flags indicate the IRQ is a wakeup source
* @is_requested: True if request_irq has been done
* @desc: gpio_desc for the GPIO pin for this event
*/
struct acpi_gpio_event {
struct list_head node;
acpi_handle handle;
irq_handler_t handler;
unsigned int pin;
unsigned int irq;
unsigned long irqflags;
bool irq_is_wake;
bool irq_requested;
struct gpio_desc *desc;
};
@ -49,10 +66,10 @@ struct acpi_gpio_chip {
/*
* For gpiochips which call acpi_gpiochip_request_interrupts() before late_init
* (so builtin drivers) we register the ACPI GpioInt event handlers from a
* (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
* late_initcall_sync handler, so that other builtin drivers can register their
* OpRegions before the event handlers can run. This list contains gpiochips
* for which the acpi_gpiochip_request_interrupts() has been deferred.
* for which the acpi_gpiochip_request_irqs() call has been deferred.
*/
static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
@ -133,8 +150,42 @@ bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
}
EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);
static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
void *context)
static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
struct acpi_gpio_event *event)
{
int ret, value;
ret = request_threaded_irq(event->irq, NULL, event->handler,
event->irqflags, "ACPI:Event", event);
if (ret) {
dev_err(acpi_gpio->chip->parent,
"Failed to setup interrupt handler for %d\n",
event->irq);
return;
}
if (event->irq_is_wake)
enable_irq_wake(event->irq);
event->irq_requested = true;
/* Make sure we trigger the initial state of edge-triggered IRQs */
value = gpiod_get_raw_value_cansleep(event->desc);
if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
event->handler(event->irq, event);
}
static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
{
struct acpi_gpio_event *event;
list_for_each_entry(event, &acpi_gpio->events, node)
acpi_gpiochip_request_irq(acpi_gpio, event);
}
static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
void *context)
{
struct acpi_gpio_chip *acpi_gpio = context;
struct gpio_chip *chip = acpi_gpio->chip;
@ -143,8 +194,7 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
struct acpi_gpio_event *event;
irq_handler_t handler = NULL;
struct gpio_desc *desc;
unsigned long irqflags;
int ret, pin, irq, value;
int ret, pin, irq;
if (!acpi_gpio_get_irq_resource(ares, &agpio))
return AE_OK;
@ -175,8 +225,6 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
gpiod_direction_input(desc);
value = gpiod_get_value_cansleep(desc);
ret = gpiochip_lock_as_irq(chip, pin);
if (ret) {
dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
@ -189,64 +237,42 @@ static acpi_status acpi_gpiochip_request_interrupt(struct acpi_resource *ares,
goto fail_unlock_irq;
}
irqflags = IRQF_ONESHOT;
if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
if (agpio->polarity == ACPI_ACTIVE_HIGH)
irqflags |= IRQF_TRIGGER_HIGH;
else
irqflags |= IRQF_TRIGGER_LOW;
} else {
switch (agpio->polarity) {
case ACPI_ACTIVE_HIGH:
irqflags |= IRQF_TRIGGER_RISING;
break;
case ACPI_ACTIVE_LOW:
irqflags |= IRQF_TRIGGER_FALLING;
break;
default:
irqflags |= IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING;
break;
}
}
event = kzalloc(sizeof(*event), GFP_KERNEL);
if (!event)
goto fail_unlock_irq;
event->irqflags = IRQF_ONESHOT;
if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
if (agpio->polarity == ACPI_ACTIVE_HIGH)
event->irqflags |= IRQF_TRIGGER_HIGH;
else
event->irqflags |= IRQF_TRIGGER_LOW;
} else {
switch (agpio->polarity) {
case ACPI_ACTIVE_HIGH:
event->irqflags |= IRQF_TRIGGER_RISING;
break;
case ACPI_ACTIVE_LOW:
event->irqflags |= IRQF_TRIGGER_FALLING;
break;
default:
event->irqflags |= IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING;
break;
}
}
event->handle = evt_handle;
event->handler = handler;
event->irq = irq;
event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE;
event->pin = pin;
event->desc = desc;
ret = request_threaded_irq(event->irq, NULL, handler, irqflags,
"ACPI:Event", event);
if (ret) {
dev_err(chip->parent,
"Failed to setup interrupt handler for %d\n",
event->irq);
goto fail_free_event;
}
if (agpio->wake_capable == ACPI_WAKE_CAPABLE)
enable_irq_wake(irq);
list_add_tail(&event->node, &acpi_gpio->events);
/*
* Make sure we trigger the initial state of the IRQ when using RISING
* or FALLING. Note we run the handlers on late_init, the AML code
* may refer to OperationRegions from other (builtin) drivers which
* may be probed after us.
*/
if (((irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
((irqflags & IRQF_TRIGGER_FALLING) && value == 0))
handler(event->irq, event);
return AE_OK;
fail_free_event:
kfree(event);
fail_unlock_irq:
gpiochip_unlock_as_irq(chip, pin);
fail_free_desc:
@ -283,6 +309,9 @@ void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
if (ACPI_FAILURE(status))
return;
acpi_walk_resources(handle, "_AEI",
acpi_gpiochip_alloc_event, acpi_gpio);
mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
defer = !acpi_gpio_deferred_req_irqs_done;
if (defer)
@ -293,8 +322,7 @@ void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
if (defer)
return;
acpi_walk_resources(handle, "_AEI",
acpi_gpiochip_request_interrupt, acpi_gpio);
acpi_gpiochip_request_irqs(acpi_gpio);
}
EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);
@ -331,10 +359,13 @@ void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
struct gpio_desc *desc;
if (irqd_is_wakeup_set(irq_get_irq_data(event->irq)))
disable_irq_wake(event->irq);
if (event->irq_requested) {
if (event->irq_is_wake)
disable_irq_wake(event->irq);
free_irq(event->irq, event);
}
free_irq(event->irq, event);
desc = event->desc;
if (WARN_ON(IS_ERR(desc)))
continue;
@ -1200,23 +1231,16 @@ bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
return con_id == NULL;
}
/* Run deferred acpi_gpiochip_request_interrupts() */
static int acpi_gpio_handle_deferred_request_interrupts(void)
/* Run deferred acpi_gpiochip_request_irqs() */
static int acpi_gpio_handle_deferred_request_irqs(void)
{
struct acpi_gpio_chip *acpi_gpio, *tmp;
mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
list_for_each_entry_safe(acpi_gpio, tmp,
&acpi_gpio_deferred_req_irqs_list,
deferred_req_irqs_list_entry) {
acpi_handle handle;
handle = ACPI_HANDLE(acpi_gpio->chip->parent);
acpi_walk_resources(handle, "_AEI",
acpi_gpiochip_request_interrupt, acpi_gpio);
list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
}
deferred_req_irqs_list_entry)
acpi_gpiochip_request_irqs(acpi_gpio);
acpi_gpio_deferred_req_irqs_done = true;
mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);
@ -1224,4 +1248,4 @@ static int acpi_gpio_handle_deferred_request_interrupts(void)
return 0;
}
/* We must use _sync so that this runs after the first deferred_probe run */
late_initcall_sync(acpi_gpio_handle_deferred_request_interrupts);
late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);