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Date:   Thu, 30 Dec 2021 13:44:53 +0100
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Hans de Goede <hdegoede@redhat.com>
Cc:     "Rafael J . Wysocki" <rafael@kernel.org>,
        Mark Gross <markgross@kernel.org>,
        Andy Shevchenko <andy@kernel.org>,
        Wolfram Sang <wsa@kernel.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Rob Herring <robh@kernel.org>,
        Jiri Slaby <jirislaby@kernel.org>, Len Brown <lenb@kernel.org>,
        linux-acpi@vger.kernel.org, platform-driver-x86@vger.kernel.org,
        linux-i2c@vger.kernel.org, Stephan Gerhold <stephan@gerhold.net>,
        linux-serial@vger.kernel.org
Subject: Re: [PATCH 03/12] serdev: Do not instantiate serdevs on boards with
 known bogus DSDT entries
Message-ID: <Yc2pxZXu6e+eAKzE@kroah.com>
References: <20211229231431.437982-1-hdegoede@redhat.com>
 <20211229231431.437982-4-hdegoede@redhat.com>
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On Thu, Dec 30, 2021 at 12:14:22AM +0100, Hans de Goede wrote:
> x86 ACPI devices which ship with only Android as their factory image use
> older kernels which do not yet support ACPI serdev enumeration, as such
> the serdev information in their ACPI tables is not reliable.
> 
> For example on the Asus ME176C tablet the serdev describing the Bluetooth
> HCI points to the serdev_controller connected to the GPS and the other way
> around.
> 
> Use the new acpi_quirk_skip_serdev_enumeration() helper to identify
> known boards with this issue and then either abort adding the serdev
> controller (creating a tty cdev instead) or only create the controller
> leaving the instantation of the serdev itself up to platform code.
> 
> In the case where only the serdev controller is created the necessary
> serdevs will instead be instantiated by the
> drivers/platform/x86/x86-android-tablets.c kernel module.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>  drivers/tty/serdev/core.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)


Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>