This is a note to let you know that I've just added the patch titled i2c: core: Call i2c_acpi_install_space_handler() before i2c_acpi_register_devices() to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: i2c-core-call-i2c_acpi_install_space_handler-before-.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit d3613063df358c3ad89245d2faecc94bbc0cc4f6 Author: Hans de Goede <hdegoede@xxxxxxxxxx> Date: Wed Sep 9 12:32:33 2020 +0200 i2c: core: Call i2c_acpi_install_space_handler() before i2c_acpi_register_devices() [ Upstream commit 21653a4181ff292480599dad996a2b759ccf050f ] Some ACPI i2c-devices _STA method (which is used to detect if the device is present) use autodetection code which probes which device is present over i2c. This requires the I2C ACPI OpRegion handler to be registered before we enumerate i2c-clients under the i2c-adapter. This fixes the i2c touchpad on the Lenovo ThinkBook 14-IIL and ThinkBook 15 IIL not getting an i2c-client instantiated and thus not working. BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1842039 Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c index f225bef1e043c..41dd0a08a625c 100644 --- a/drivers/i2c/i2c-core-base.c +++ b/drivers/i2c/i2c-core-base.c @@ -1292,8 +1292,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap) /* create pre-declared device nodes */ of_i2c_register_devices(adap); - i2c_acpi_register_devices(adap); i2c_acpi_install_space_handler(adap); + i2c_acpi_register_devices(adap); if (adap->nr < __i2c_first_dynamic_bus_num) i2c_scan_static_board_info(adap);