linux-kernel - Re: [PATCH] platform/x86: intel-hid: Wake up Dell Latitude 7275 from suspend-to-idle

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Date:   Tue, 1 Aug 2017 13:56:35 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Darren Hart <dvhart@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jérôme de Bretagne 
        <jerome.debretagne@...il.com>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Alex Hung <alex.hung@...onical.com>
Subject: Re: [PATCH] platform/x86: intel-hid: Wake up Dell Latitude 7275 from suspend-to-idle

On Tue, Aug 1, 2017 at 1:21 AM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Tue, Aug 1, 2017 at 12:46 AM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>> On Friday, July 28, 2017 02:06:36 AM Rafael J. Wysocki wrote:
>>> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>>
>>> On Dell Latitude 7275 the 5-button array is not exposed in the
>>> ACPI tables, but still notifies are sent to the Intel HID device
>>> object (device ID INT33D5) in response to power button actions while
>>> suspended to idle.  However, they are currently ignored as the
>>> intel-hid driver is not prepared to take care of them.
>>>
>>> As a result, power button wakeup from suspend-to-idle doesn't work
>>> on this platform, but suspend-to-idle is the only reliable suspend
>>> variant on it (the S3 implementation in the platform firmware turns
>>> out to be broken), so it would be good to handle it properly.
>>>
>>> For this reason, add an upfront check against the power button press
>>> event (0xCE) to notify_handler() in the wakeup mode which allows it
>>> to catch the power button wakeup notification on the affected
>>> platform (even though priv->array is NULL on it) and should not
>>> change the behavior on platforms with priv->array present (because
>>> priv->array contains the event in question in those cases).
>>>
>>> Link: https://bugzilla.kernel.org/show_bug.cgi?id=196115
>>> Tested-by: Jérôme de Bretagne <jerome.debretagne@...il.com>
>>> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>>
>> Please note that this change is requisite for
>>
>> https://patchwork.kernel.org/patch/9873159/
>>
>> so are there any objections or concerns?
>
> Not from my side,
>
> Acked-by: Andy Shevchenko <andy.shevchenko@...il.com>

OK, thanks!

I'm going to route it through the PM tree then if that's not a problem.

Thanks,
Rafael