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    HID: i2c-hid: Put ACPI enumerated devices in D3 on shutdown · 5c7e02a8
    Hans de Goede 提交于
    The i2c-hid driver would quietly fail to probe the i2c-hid sensor-hub
    with an ACPI device-id of SMO91D0 every other boot.
    
    Specifically, the i2c_smbus_read_byte() "Make sure there is something at
    this address" check would fail every other boot.
    
    It seems that the BIOS does not properly reset/power-cycle the device
    leaving it in a confused state where it refuses to respond to i2c-xfers.
    On boots where probing the device failed, the driver-core puts the device
    in D3 after the probe-failure, which causes the probe to succeed the next
    boot.
    
    Putting the device in D3 from the shutdown-handler fixes the sensors not
    working every other boot.
    
    This has been tested on both a Lenovo Miix 2-10 and a Dell Venue 8 Pro 5830
    both of which use an i2c-hid sensor-hub with an ACPI id of SMO91D0.
    
    Note that it is safe to call acpi_device_set_power() with a NULL pointer
    as first argument, so on none ACPI enumerated devices this change is a
    no-op.
    
    Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>
    Signed-off-by: NHans de Goede <hdegoede@redhat.com>
    Acked-by: NKai-Heng Feng <kai.heng.feng@canonical.com>
    Signed-off-by: NJiri Kosina <jkosina@suse.cz>
    5c7e02a8
i2c-hid-core.c 32.7 KB