From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ 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@microsoft.com Fixes: 6989ea4881c8 ("pinctrl: intel: Save and restore pins in "direct IRQ" mode") Tested-by: Jim Minter jimminter@microsoft.com Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Acked-by: Mika Westerberg mika.westerberg@linux.intel.com Link: https://lore.kernel.org/r/20230206141558.20916-1-andriy.shevchenko@linux.int... Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 047a8374b4fdc..954a412267402 100644 --- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -1676,6 +1676,12 @@ const struct intel_pinctrl_soc_data *intel_pinctrl_get_soc_data(struct platform_ EXPORT_SYMBOL_GPL(intel_pinctrl_get_soc_data);
#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); @@ -1709,8 +1715,7 @@ 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; @@ -1840,7 +1845,12 @@ int intel_pinctrl_resume_noirq(struct device *dev) for (i = 0; i < pctrl->soc->npins; i++) { const struct pinctrl_pin_desc *desc = &pctrl->soc->pins[i];
- 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;
intel_restore_padcfg(pctrl, desc->number, PADCFG0, pads[i].padcfg0);