linux-kernel - Re: [PATCH 1/2] gpio: acpi: add quirk to override GpioInt polarity

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Message-ID: <20190830114226.GW2680@smile.fi.intel.com>
Date:   Fri, 30 Aug 2019 14:42:26 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Peter Cai <peter@...eblog.net>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Bastien Nocera <hadess@...ess.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, linux-gpio@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: Re: [PATCH 1/2] gpio: acpi: add quirk to override GpioInt polarity

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