gpio: vf610: Mask all GPIO interrupts

BugLink: https://bugs.launchpad.net/bugs/1837813
[ Upstream commit 7ae710f9f8b2cf95297e7bbfe1c09789a7dc43d4 ]

On SoC reset all GPIO interrupts are disable. However, if kexec is
used to boot into a new kernel, the SoC does not experience a
reset. Hence GPIO interrupts can be left enabled from the previous
kernel. It is then possible for the interrupt to fire before an
interrupt handler is registered, resulting in the kernel complaining
of an "unexpected IRQ trap", the interrupt is never cleared, and so
fires again, resulting in an interrupt storm.

Disable all GPIO interrupts before registering the GPIO IRQ chip.

Fixes: 7f2691a19627 ("gpio: vf610: add gpiolib/IRQ chip driver for Vybrid")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/gpio/gpio-vf610.c b/drivers/gpio/gpio-vf610.c
index 4610cc2938ad01710250da1e52b992db43332fd4..624953a314abddcdd8b3a23f4972c862bc944c1d 100644 (file)
--- a/drivers/gpio/gpio-vf610.c
+++ b/drivers/gpio/gpio-vf610.c
@@ -261,6 +261,7 @@ static int vf610_gpio_probe(struct platform_device *pdev)
        struct vf610_gpio_port *port;
        struct resource *iores;
        struct gpio_chip *gc;
+       int i;
        int ret;
 
        port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
@@ -300,6 +301,10 @@ static int vf610_gpio_probe(struct platform_device *pdev)
        if (ret < 0)
                return ret;
 
+       /* Mask all GPIO interrupts */
+       for (i = 0; i < gc->ngpio; i++)
+               vf610_gpio_writel(0, port->base + PORT_PCR(i));
+
        /* Clear the interrupt status register for all GPIO's */
        vf610_gpio_writel(~0, port->base + PORT_ISFR);