Re: [PATCH v2] HID: i2c-hid: Unfollow the panel on shutdown

[Jiri Kosina]

On Tue, 8 Sep 2026, Justin Yeh wrote:

> i2c_hid_core_shutdown() sends SET_POWER(SLEEP) even for panel followers,
> but nothing in device_shutdown() guarantees whether the panel, and hence
> our own power, is still on by the time we get there.
> 
> Do what i2c_hid_core_remove() does and just unfollow the panel.
> drm_panel_remove_follower() calls panel_unpreparing() only while the
> panel is still prepared, which powers us down properly; if it is already
> unprepared no transfer is attempted at all. On MT8196 the panel is
> unprepared long before us, so this also drops the ~2s i2c bus timeout
> from every reboot.
> 
> Fixes: 96a37bfd232a ("HID: i2c-hid: Support being a panel follower")
> Suggested-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> Signed-off-by: Justin Yeh <justin.yeh@xxxxxxxxxxxx>

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs