[PATCH 0/2] Input: synaptics - enable SMBus for ThinkPad P14s Gen 2i (LEN2072)

[Dmitry Mikushin <dmitry@kernelgen.org>]

The ThinkPad P14s Gen 2i touchpad (Synaptics TM3471-030, LEN2072) is
not on the SMBus passlist and runs in PS/2 mode. Forcing RMI4 alone
does not help: the F12 attention handler reads the whole 79-byte data
packet over SMBus on every frame, which caps the report rate at about
43 Hz and loses fast swipes.

Patch 1 makes F12 read only the object data it consumes, raising the
report rate to about 65 Hz on this machine. Patch 2 then adds LEN2072
to smbus_pnp_ids. Patch 2 should not be applied without patch 1.

Both were tested on a ThinkPad P14s Gen 2i (20VX) on 7.2.9, including
s2idle suspend/resume and the TrackPoint on the RMI4 pass-through port.

Dmitry Mikushin (2):
  Input: synaptics-rmi4 - f12: read only the object data on attention
  Input: synaptics - add LEN2072 to smbus_pnp_ids for ThinkPad P14s Gen
    2i

 drivers/input/mouse/synaptics.c |  1 +
 drivers/input/rmi4/rmi_f12.c    | 16 +++++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

-- 
2.56.0