From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
[ Upstream commit a8520be3ffef3d25b53bf171a7ebe17ee0154175 ]
If the firmware mangled the register contents too much,
check the saved value for the Direct IRQ mode. If it
matches, we will restore the pin state.
Reported-by: Jim Minter <jimminter@xxxxxxxxxxxxx>
Fixes: 6989ea4881c8 ("pinctrl: intel: Save and restore pins in "direct IRQ" mode")
Tested-by: Jim Minter <jimminter@xxxxxxxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230206141558.20916-1-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/pinctrl/intel/pinctrl-intel.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index e0cb76f7e5407..32c6326337f73 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1510,6 +1510,12 @@ int intel_pinctrl_probe_by_uid(struct platform_device *pdev)
EXPORT_SYMBOL_GPL(intel_pinctrl_probe_by_uid);
#ifdef CONFIG_PM_SLEEP
+static bool __intel_gpio_is_direct_irq(u32 value)
+{
+ return (value & PADCFG0_GPIROUTIOXAPIC) && (value & PADCFG0_GPIOTXDIS) &&
+ (__intel_gpio_get_gpio_mode(value) == PADCFG0_PMODE_GPIO);
+}
+
static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int pin)
{
const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin);
@@ -1543,8 +1549,7 @@ static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int
* See https://bugzilla.kernel.org/show_bug.cgi?id=214749.
*/
value = readl(intel_get_padcfg(pctrl, pin, PADCFG0));
- if ((value & PADCFG0_GPIROUTIOXAPIC) && (value & PADCFG0_GPIOTXDIS) &&
- (__intel_gpio_get_gpio_mode(value) == PADCFG0_PMODE_GPIO))
+ if (__intel_gpio_is_direct_irq(value))
return true;
return false;
@@ -1656,7 +1661,12 @@ int intel_pinctrl_resume_noirq(struct device *dev)
void __iomem *padcfg;
u32 val;
- if (!intel_pinctrl_should_save(pctrl, desc->number))
+ if (!(intel_pinctrl_should_save(pctrl, desc->number) ||
+ /*
+ * If the firmware mangled the register contents too much,
+ * check the saved value for the Direct IRQ mode.
+ */
+ __intel_gpio_is_direct_irq(pads[i].padcfg0)))
continue;
padcfg = intel_get_padcfg(pctrl, desc->number, PADCFG0);
--
2.39.0
