linux-kernel - [PATCH 5.16 028/121] gpiolib: acpi: Convert ACPI value of debounce to microseconds

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Date:   Mon, 14 Mar 2022 12:53:31 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 028/121] gpiolib: acpi: Convert ACPI value of debounce to microseconds

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit 660c619b9d7ccd28648ee3766cdbe94ec7b27402 ]

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@...onical.com>
Fixes: 8dcb7a15a585 ("gpiolib: acpi: Take into account debounce settings")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Tested-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpio/gpiolib-acpi.c |  6 ++++--
 drivers/gpio/gpiolib.c      | 10 ++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index feb8157d2d67..c49b3b5334cd 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -308,7 +308,8 @@ 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",
@@ -1049,7 +1050,8 @@ 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 abfbf546d159..a1dca6dc03b4 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2191,6 +2191,16 @@ 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,
-- 
2.34.1