linux-kernel - Re: [PATCH v1 1/2] platform/x86: int3472: add hpd pin support

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Message-ID: <Z_zDGYD1QXZYWwI9@smile.fi.intel.com>
Date: Mon, 14 Apr 2025 11:11:05 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: "Yan, Dongcheng" <dongcheng.yan@...ux.intel.com>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Dongcheng Yan <dongcheng.yan@...el.com>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	sakari.ailus@...ux.intel.com, hverkuil@...all.nl,
	u.kleine-koenig@...libre.com, ricardo.ribalda@...il.com,
	bingbu.cao@...ux.intel.com, stable@...r.kernel.org,
	hao.yao@...el.com
Subject: Re: [PATCH v1 1/2] platform/x86: int3472: add hpd pin support

On Mon, Apr 14, 2025 at 03:52:50PM +0800, Yan, Dongcheng wrote:
> On 4/11/2025 4:33 PM, Hans de Goede wrote:
> > On 11-Apr-25 10:23 AM, Dongcheng Yan wrote:

...

> >> +	case INT3472_GPIO_TYPE_HOTPLUG_DETECT:
> >> +		*con_id = "hpd";
> >> +		*gpio_flags = GPIO_LOOKUP_FLAGS_DEFAULT;
> > 
> > This looks wrong, we really need to clearly provide a polarity
> > here since the ACPI GPIO resources do not provide one.
> > 
> I tested gpio_flags=GPIO_LOOKUP_FLAGS_DEFAULT/HIGH/LOW, the lt6911uxe
> driver can pass the test and work normally.

I doubt you tested that correctly. It's impossible to have level triggered
event to work with either polarity. It might be also a bug in the code lurking
somewhere, but it would be unlikely (taking into account amount of systems
relying on this).

Is it edge triggered event?

-- 
With Best Regards,
Andy Shevchenko