linux-kernel - [PATCH 0/3] HID: i2c-hid: Probe and wake device with HID descriptor fetch

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Message-ID: <20240415170517.18780-1-kl@kl.wtf>
Date: Mon, 15 Apr 2024 19:04:10 +0200
From: Kenny Levinsen <kl@...wtf>
To: Jiri Kosina <jikos@...nel.org>,
	Dmitry Torokhov <dtor@...omium.org>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Douglas Anderson <dianders@...omium.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Maxime Ripard <mripard@...nel.org>,
	Kai-Heng Feng <kai.heng.feng@...onical.com>,
	Johan Hovold <johan+linaro@...nel.org>,
	linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Radoslaw Biernacki <rad@...omium.org>,
	Lukasz Majczak <lma@...omium.org>
Subject: [PATCH 0/3] HID: i2c-hid: Probe and wake device with HID descriptor fetch

This is in response to
https://lore.kernel.org/all/Zh0qKeI-YPDE-NVT@hovoldconsulting.com/

Instead of extending the existing smbus probe to include a retry loop,
this patch takes the same approach as i2c_hid_set_power() by retrying on
EREMOTEIO.

This maintains the "silent" error in case no device is present without
having to send any dummy commands. Tested with a disconnected touchpad
on a Dell XPS 13.

I left out the particular sleep. If one is needed, it should also be
added to i2c_hid_set_power() which is where we'd wake the device after
resuming from suspend.

Lukasz and Radoslaw, can you please test if this still does the trick?