ACPI: LPSS: Add dmi quirk for skipping _DEP check for some device-links
authorHans de Goede <hdegoede@redhat.com>
Thu, 24 Oct 2019 21:57:23 +0000 (23:57 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 17 Dec 2019 18:56:32 +0000 (19:56 +0100)
commit4b598c171e622c4775314541c68fd13245ded6c2
tree84cd06afe7c31d98962ed218fd8124cde328a745
parent4cbdbad9ae74bae258a074b036c9be08c4f0ad0f
ACPI: LPSS: Add dmi quirk for skipping _DEP check for some device-links

commit 6025e2fae3dde3c3d789d08f8ceacbdd9f90d471 upstream.

The iGPU / GFX0 device's _PS0 method on the ASUS T200TA depends on the
I2C1 controller (which is connected to the embedded controller). But unlike
in the T100TA/T100CHI this dependency is not listed in the _DEP of the GFX0
device.

This results in the dev_WARN_ONCE(..., "Transfer while suspended\n") call
in i2c-designware-master.c triggering and the AML code not working as it
should.

This commit fixes this by adding a dmi based quirk mechanism for devices
which miss a _DEP, and adding a quirk for the LNXVIDEO depending on the
I2C1 device on the Asus T200TA.

Fixes: 2d71ee0ce72f ("ACPI / LPSS: Add a device link from the GPU to the BYT I2C5 controller")
Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: 4.20+ <stable@vger.kernel.org> # 4.20+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/acpi/acpi_lpss.c