pinctrl: amd: Mask non-wake source pins with interrupt enabled at suspend

[ Upstream commit 2fff0b5e1a6b9c577b4dd4958902c877159c856b ]

If a pin isn't marked as a wake source processing any interrupts is
just going to destroy battery life.  The APU may wake up from a hardware
sleep state to process the interrupt but not return control to the OS.

Mask interrupt for all non-wake source pins at suspend. They'll be
re-enabled at resume.

Reported-and-tested-by: Marcus Aram <marcus+oss@oxar.nl>
Reported-and-tested-by: Mark Herbert <mark.herbert42@gmail.com>
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2812
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20231203032431.30277-3-mario.limonciello@amd.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index 74241b2..86034c4 100644 (file)
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -923,6 +923,15 @@ static int amd_gpio_suspend(struct device *dev)
 
                raw_spin_lock_irqsave(&gpio_dev->lock, flags);
                gpio_dev->saved_regs[i] = readl(gpio_dev->base + pin * 4) & ~PIN_IRQ_PENDING;
+
+               /* mask any interrupts not intended to be a wake source */
+               if (!(gpio_dev->saved_regs[i] & WAKE_SOURCE)) {
+                       writel(gpio_dev->saved_regs[i] & ~BIT(INTERRUPT_MASK_OFF),
+                              gpio_dev->base + pin * 4);
+                       pm_pr_dbg("Disabling GPIO #%d interrupt for suspend.\n",
+                                 pin);
+               }
+
                raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
        }
 

diff --git a/drivers/pinctrl/pinctrl-amd.h b/drivers/pinctrl/pinctrl-amd.h
index 34c5c3e..cf59089 100644 (file)
--- a/drivers/pinctrl/pinctrl-amd.h
+++ b/drivers/pinctrl/pinctrl-amd.h
@@ -80,6 +80,11 @@
 #define FUNCTION_MASK          GENMASK(1, 0)
 #define FUNCTION_INVALID       GENMASK(7, 0)
 
+#define WAKE_SOURCE    (BIT(WAKE_CNTRL_OFF_S0I3) | \
+                        BIT(WAKE_CNTRL_OFF_S3)   | \
+                        BIT(WAKE_CNTRL_OFF_S4)   | \
+                        BIT(WAKECNTRL_Z_OFF))
+
 struct amd_function {
        const char *name;
        const char * const groups[NSELECTS];