From: Andy Shevchenko andriy.shevchenko@linux.intel.com
commit 6989ea4881c8944fbf04378418bb1af63d875ef8 upstream.
The firmware on some systems may configure GPIO pins to be an interrupt source in so called "direct IRQ" mode. In such cases the GPIO controller driver has no idea if those pins are being used or not. At the same time, there is a known bug in the firmwares that don't restore the pin settings correctly after suspend, i.e. by an unknown reason the Rx value becomes inverted.
Hence, let's save and restore the pins that are configured as GPIOs in the input mode with GPIROUTIOXAPIC bit set.
Cc: stable@vger.kernel.org Reported-and-tested-by: Dale Smith dalepsmith@gmail.com Reported-and-tested-by: John Harris jmharris@gmail.com BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214749 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/20221124222926.72326-1-andriy.shevchenko@linux.int... Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pinctrl/intel/pinctrl-intel.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-)
--- a/drivers/pinctrl/intel/pinctrl-intel.c +++ b/drivers/pinctrl/intel/pinctrl-intel.c @@ -436,9 +436,14 @@ static void __intel_gpio_set_direction(v writel(value, padcfg0); }
+static int __intel_gpio_get_gpio_mode(u32 value) +{ + return (value & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; +} + static int intel_gpio_get_gpio_mode(void __iomem *padcfg0) { - return (readl(padcfg0) & PADCFG0_PMODE_MASK) >> PADCFG0_PMODE_SHIFT; + return __intel_gpio_get_gpio_mode(readl(padcfg0)); }
static void intel_gpio_set_gpio_mode(void __iomem *padcfg0) @@ -1674,6 +1679,7 @@ EXPORT_SYMBOL_GPL(intel_pinctrl_get_soc_ static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int pin) { const struct pin_desc *pd = pin_desc_get(pctrl->pctldev, pin); + u32 value;
if (!pd || !intel_pad_usable(pctrl, pin)) return false; @@ -1688,6 +1694,25 @@ static bool intel_pinctrl_should_save(st gpiochip_line_is_irq(&pctrl->chip, intel_pin_to_gpio(pctrl, pin))) return true;
+ /* + * The firmware on some systems may configure GPIO pins to be + * an interrupt source in so called "direct IRQ" mode. In such + * cases the GPIO controller driver has no idea if those pins + * are being used or not. At the same time, there is a known bug + * in the firmwares that don't restore the pin settings correctly + * after suspend, i.e. by an unknown reason the Rx value becomes + * inverted. + * + * Hence, let's save and restore the pins that are configured + * as GPIOs in the input mode with GPIROUTIOXAPIC bit set. + * + * 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)) + return true; + return false; }