Re: [PATCH v2 0/3] Input: synaptics - enable SMBus for ThinkPad P14s Gen 2i (LEN2072)

[Dmitry Torokhov]

On Mon, Oct 26, 2026 at 03:26:45PM +0100, Dmitry Mikushin wrote:
> 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 fixes the size passed to rmi_f12_process_objects(), which
> counted from the start of the data packet instead of from Data1.
> Patch 2 makes F12 read only the registers up to and including Data1,
> raising the report rate to about 65 Hz on this machine. Patch 3 then
> adds LEN2072 to smbus_pnp_ids and should not be applied without
> patch 2.
> 
> 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. On
> this device Data1 is the first data register, so patch 1 does not
> change its behavior.
> 
> Changes in v2:
> - New patch 1. Sashiko pointed out that with patch 2 alone, on devices
>   where Data1 is not at offset 0, rmi_f12_process_objects() could parse
>   bytes past the end of what was read. The underlying off-by-
>   data1_offset bound predates this series, so it is fixed separately
>   with a Fixes: tag.
> - No changes to patches 2 and 3.

Applied the lot, thank you.

-- 
Dmitry