On Fri, Aug 30, 2019 at 08:00:23AM +0800, Peter Cai wrote:

On GPD P2 Max, the firmware could not reset the touch panel correctly.
The kernel needs to take on the job instead, but the GpioInt definition
in DSDT specifies ActiveHigh while the GPIO pin should actually be
ActiveLow.

We need to override the polarity defined by DSDT. The GPIO driver
already allows defining polarity in acpi_gpio_params, but the option is
not applied to GpioInt.

This patch adds a new quirk that enables the polarity specified in
acpi_gpio_params to also be applied to GpioInt.

In general if it's really the case, I'm not objecting to have another quirk.
So, I would wait for the comments on the second patch to see how it's going.

 include/linux/acpi.h        |  6 ++++++

The GPIO part of the header had been moved to the drivers/gpio/gpiolib-acpi.h.
Please, base your series on top of the gpio/for-next.

 			lookup->info.flags = GPIOD_IN;
-			lookup->info.polarity = agpio->polarity;

+			if (lookup->info.quirks &
+					ACPI_GPIO_QUIRK_OVERRIDE_POLARITY) {

Disregard checkpatch I would leave this on one line.

+				dev_warn(&lookup->info.adev->dev, FW_BUG "Incorrect polarity specified by GpioInt, overriding.\n");
+				lookup->info.polarity = lookup->active_low;
+			} else {
+				lookup->info.polarity = agpio->polarity;
+			}
 			lookup->info.triggering = agpio->triggering;

Since the quirk makes sense only for GpioInt and basically no-op for GpioIo,
I would move the check out of if (gpioint) {} else {} conditional:

	if (gpioint) {
		...
	} else {
		...
	}

	if (quirk) {
		dev_warn();
		polarity = ...;
	}

-- 
With Best Regards,
Andy Shevchenko