diff mbox series

[J/OEM-5.14,1/2] gpiolib: acpi: Convert ACPI value of debounce to microseconds

Message ID 20220323031854.31008-2-kai.heng.feng@canonical.com
State New
Headers show
Series [J/OEM-5.14,1/2] gpiolib: acpi: Convert ACPI value of debounce to microseconds | expand

Commit Message

Kai-Heng Feng March 23, 2022, 3:18 a.m. UTC 
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1966010

It appears that GPIO ACPI library uses ACPI debounce values directly.
However, the GPIO library APIs expect the debounce timeout to be in
microseconds.

Convert ACPI value of debounce to microseconds.

While at it, document this detail where it is appropriate.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=215664
Reported-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Fixes: 8dcb7a15a585 ("gpiolib: acpi: Take into account debounce settings")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
(cherry picked from commit 660c619b9d7ccd28648ee3766cdbe94ec7b27402)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/gpio/gpiolib-acpi.c |  6 ++++--
 drivers/gpio/gpiolib.c      | 10 ++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index d040c72fea582..4c2e32c38acca 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -311,7 +311,8 @@  static struct gpio_desc *acpi_request_own_gpiod(struct gpio_chip *chip,
 	if (IS_ERR(desc))
 		return desc;
 
-	ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout);
+	/* ACPI uses hundredths of milliseconds units */
+	ret = gpio_set_debounce_timeout(desc, agpio->debounce_timeout * 10);
 	if (ret)
 		dev_warn(chip->parent,
 			 "Failed to set debounce-timeout for pin 0x%04X, err %d\n",
@@ -1052,7 +1053,8 @@  int acpi_dev_gpio_irq_get_by(struct acpi_device *adev, const char *name, int ind
 			if (ret < 0)
 				return ret;
 
-			ret = gpio_set_debounce_timeout(desc, info.debounce);
+			/* ACPI uses hundredths of milliseconds units */
+			ret = gpio_set_debounce_timeout(desc, info.debounce * 10);
 			if (ret)
 				return ret;
 
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index d1b9b721218f2..9e151413f51a6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2186,6 +2186,16 @@  static int gpio_set_bias(struct gpio_desc *desc)
 	return gpio_set_config_with_argument_optional(desc, bias, arg);
 }
 
+/**
+ * gpio_set_debounce_timeout() - Set debounce timeout
+ * @desc:	GPIO descriptor to set the debounce timeout
+ * @debounce:	Debounce timeout in microseconds
+ *
+ * The function calls the certain GPIO driver to set debounce timeout
+ * in the hardware.
+ *
+ * Returns 0 on success, or negative error code otherwise.
+ */
 int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce)
 {
 	return gpio_set_config_with_argument_optional(desc,