[PATCH 5.15 080/110] pinctrl: intel: Fix a glitch when updating IRQ flags on a preconfigured line

Greg Kroah-Hartman
2022-02-07T12:00:14Z

From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

commit e12963c453263d5321a2c610e98cbc731233b685 upstream.

The commit af7e3eeb84e2 ("pinctrl: intel: Disable input and output buffer
when switching to GPIO") hadn't taken into account an update of the IRQ
flags scenario.

When updating the IRQ flags on the preconfigured line the ->irq_set_type()
is called again. In such case the sequential Rx buffer configuration
changes may trigger a falling or rising edge interrupt that may lead,
on some platforms, to an undesired event.

This may happen because each of intel_gpio_set_gpio_mode() and
__intel_gpio_set_direction() updates the pad configuration with a different
value of the GPIORXDIS bit. Notable, that the intel_gpio_set_gpio_mode() is
called only for the pads that are configured as an input. Due to this fact,
integrate the logic of __intel_gpio_set_direction() call into the
intel_gpio_set_gpio_mode() so that the Rx buffer won't be disabled and
immediately re-enabled.

Fixes: af7e3eeb84e2 ("pinctrl: intel: Disable input and output buffer when switching to GPIO")
Reported-by: Kane Chen <kane.chen@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Grace Kao <grace.kao@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pinctrl/intel/pinctrl-intel.c | 10 ++--------
1 file changed, 2 insertions(+), 8 deletions(-)

--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -451,8 +451,8 @@ static void intel_gpio_set_gpio_mode(voi
value &= ~PADCFG0_PMODE_MASK;
value |= PADCFG0_PMODE_GPIO;

- /* Disable input and output buffers */
- value |= PADCFG0_GPIORXDIS;
+ /* Disable TX buffer and enable RX (this will be input) */
+ value &= ~PADCFG0_GPIORXDIS;
value |= PADCFG0_GPIOTXDIS;

/* Disable SCI/SMI/NMI generation */
@@ -497,9 +497,6 @@ static int intel_gpio_request_enable(str

intel_gpio_set_gpio_mode(padcfg0);

- /* Disable TX buffer and enable RX (this will be input) */
- __intel_gpio_set_direction(padcfg0, true);
-
raw_spin_unlock_irqrestore(&pctrl->lock, flags);

return 0;
@@ -1115,9 +1112,6 @@ static int intel_gpio_irq_type(struct ir

intel_gpio_set_gpio_mode(reg);

- /* Disable TX buffer and enable RX (this will be input) */
- __intel_gpio_set_direction(reg, true);
-
value = readl(reg);

value &= ~(PADCFG0_RXEVCFG_MASK | PADCFG0_RXINV);