pinctrl: amd: Don't save/restore interrupt status and wake status bits

commit b8c824a869f220c6b46df724f85794349bafbf23 upstream.

Saving/restoring interrupt and wake status bits across suspend can
cause the suspend to fail if an IRQ is serviced across the
suspend cycle.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Fixes: 79d2c8bede2c ("pinctrl/amd: save pin registers over suspend/resume")
Link: https://lore.kernel.org/r/20220613064127.220416-3-Basavaraj.Natikar@amd.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index 8d2dbf607bd157dcf0df124f73ac73f0f351f49a..66b9c5826ec0316c53497d97ad284a10b1881ca1 100644 (file)
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -798,6 +798,7 @@ static int amd_gpio_suspend(struct device *dev)
        struct platform_device *pdev = to_platform_device(dev);
        struct amd_gpio *gpio_dev = platform_get_drvdata(pdev);
        struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
+       unsigned long flags;
        int i;
 
        for (i = 0; i < desc->npins; i++) {
@@ -806,7 +807,9 @@ static int amd_gpio_suspend(struct device *dev)
                if (!amd_gpio_should_save(gpio_dev, pin))
                        continue;
 
-               gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin*4);
+               raw_spin_lock_irqsave(&gpio_dev->lock, flags);
+               gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
+               raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
        }
 
        return 0;
@@ -817,6 +820,7 @@ static int amd_gpio_resume(struct device *dev)
        struct platform_device *pdev = to_platform_device(dev);
        struct amd_gpio *gpio_dev = platform_get_drvdata(pdev);
        struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
+       unsigned long flags;
        int i;
 
        for (i = 0; i < desc->npins; i++) {
@@ -825,7 +829,10 @@ static int amd_gpio_resume(struct device *dev)
                if (!amd_gpio_should_save(gpio_dev, pin))
                        continue;
 
-               writel(gpio_dev->saved_regs[i], gpio_dev->base + pin*4);
+               raw_spin_lock_irqsave(&gpio_dev->lock, flags);
+               gpio_dev->saved_regs[i] |= readl(gpio_dev->base + pin * 4) & PIN_IRQ_PENDING;
+               writel(gpio_dev->saved_regs[i], gpio_dev->base + pin * 4);
+               raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
        }
 
        return 0;