[PATCH 5.10 04/86] pinctrl: amd: Dont save/restore interrupt status and wake status bits

From: Greg Kroah-Hartman
Date: Mon Aug 29 2022 - 07:06:16 EST


From: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
Fixes: 79d2c8bede2c ("pinctrl/amd: save pin registers over suspend/resume")
Link: https://lore.kernel.org/r/20220613064127.220416-3-Basavaraj.Natikar@xxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pinctrl/pinctrl-amd.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -815,6 +815,7 @@ static int amd_gpio_suspend(struct devic
{
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
+ unsigned long flags;
int i;

for (i = 0; i < desc->npins; i++) {
@@ -823,7 +824,9 @@ static int amd_gpio_suspend(struct devic
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;
@@ -833,6 +836,7 @@ static int amd_gpio_resume(struct device
{
struct amd_gpio *gpio_dev = dev_get_drvdata(dev);
struct pinctrl_desc *desc = gpio_dev->pctrl->desc;
+ unsigned long flags;
int i;

for (i = 0; i < desc->npins; i++) {
@@ -841,7 +845,10 @@ static int amd_gpio_resume(struct device
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;