Patch "pinctrl: st: add irq_request/release_resources callbacks" has been added to the 4.4-stable tree

Patch "pinctrl: st: add irq_request/release_resources callbacks" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    pinctrl: st: add irq_request/release_resources callbacks

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pinctrl-st-add-irq_request-release_resources-callbacks.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Dec 21 10:35:49 CET 2017
From: Patrice Chotard <patrice.chotard@st.com>
Date: Thu, 16 Mar 2017 18:26:02 +0100
Subject: pinctrl: st: add irq_request/release_resources callbacks

From: Patrice Chotard <patrice.chotard@st.com>


[ Upstream commit e855fa9a65c40788b5069abb0d094537daa22e05 ]

When using GPIO as IRQ source, the GPIO must be configured
in INPUT. Callbacks dedicated for this was missing in
pinctrl-st driver.

This fix the following kernel error when trying to lock a gpio
as IRQ:

[    7.521095] gpio gpiochip7: (PIO11): gpiochip_lock_as_irq: tried to flag a GPIO set as output for IRQ
[    7.526018] gpio gpiochip7: (PIO11): unable to lock HW IRQ 6 for IRQ
[    7.529405] genirq: Failed to request resources for 0-0053 (irq 81) on irqchip GPIO

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/pinctrl/pinctrl-st.c |   30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -1338,6 +1338,22 @@ static void st_gpio_irq_unmask(struct ir
 	writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
 }
 
+static int st_gpio_irq_request_resources(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	st_gpio_direction_input(gc, d->hwirq);
+
+	return gpiochip_lock_as_irq(gc, d->hwirq);
+}
+
+static void st_gpio_irq_release_resources(struct irq_data *d)
+{
+	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+	gpiochip_unlock_as_irq(gc, d->hwirq);
+}
+
 static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
 {
 	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -1493,12 +1509,14 @@ static struct gpio_chip st_gpio_template
 };
 
 static struct irq_chip st_gpio_irqchip = {
-	.name		= "GPIO",
-	.irq_disable	= st_gpio_irq_mask,
-	.irq_mask	= st_gpio_irq_mask,
-	.irq_unmask	= st_gpio_irq_unmask,
-	.irq_set_type	= st_gpio_irq_set_type,
-	.flags		= IRQCHIP_SKIP_SET_WAKE,
+	.name			= "GPIO",
+	.irq_request_resources	= st_gpio_irq_request_resources,
+	.irq_release_resources	= st_gpio_irq_release_resources,
+	.irq_disable		= st_gpio_irq_mask,
+	.irq_mask		= st_gpio_irq_mask,
+	.irq_unmask		= st_gpio_irq_unmask,
+	.irq_set_type		= st_gpio_irq_set_type,
+	.flags			= IRQCHIP_SKIP_SET_WAKE,
 };
 
 static int st_gpiolib_register_bank(struct st_pinctrl *info,


Patches currently in stable-queue which might be from patrice.chotard@st.com are

queue-4.4/pinctrl-st-add-irq_request-release_resources-callbacks.patch