2022-11-24 22:48:23

by Andy Shevchenko

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Subject: [PATCH v1 1/1] pinctrl: intel: Save and restore pins in "direct IRQ" mode

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: [email protected]
Reported-and-tested-by: Dale Smith <[email protected]>
Reported-and-tested-by: John Harris <[email protected]>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214749
Signed-off-by: Andy Shevchenko <[email protected]>
---

Linus, I hope that this can still make v6.1 release. I'm not going to
send a PR for this change unless you insist.

drivers/pinctrl/intel/pinctrl-intel.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 739030e24093..57553ac77518 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -446,9 +446,14 @@ static void __intel_gpio_set_direction(void __iomem *padcfg0, bool input)
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)
@@ -1705,6 +1710,7 @@ EXPORT_SYMBOL_GPL(intel_pinctrl_get_soc_data);
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;
@@ -1719,6 +1725,25 @@ static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int
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;
}

--
2.35.1


2022-11-25 06:56:21

by Mika Westerberg

[permalink] [raw]
Subject: Re: [PATCH v1 1/1] pinctrl: intel: Save and restore pins in "direct IRQ" mode

On Fri, Nov 25, 2022 at 12:29:26AM +0200, Andy Shevchenko wrote:
> 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: [email protected]
> Reported-and-tested-by: Dale Smith <[email protected]>
> Reported-and-tested-by: John Harris <[email protected]>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214749
> Signed-off-by: Andy Shevchenko <[email protected]>

Thanks Andy!

Acked-by: Mika Westerberg <[email protected]>