linux-kernel - [Regression]: Commit 74d905d2 breaks the touchpad and touchscreen of Google Chromebook "samus"

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Message-ID: <735253bd-5500-2b8d-c98d-99bddb0617ce@web.de>
Date:   Wed, 4 Nov 2020 09:13:45 +0100
From:   Andre <andre.muller@....de>
To:     Nick Dyer <nick.dyer@...ev.co.uk>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "George G. Davis" <george_davis@...tor.com>,
        Jiada Wang <jiada_wang@...tor.com>,
        linux-kernel@...r.kernel.org
Subject: [Regression]: Commit 74d905d2 breaks the touchpad and touchscreen of
 Google Chromebook "samus"

Hi,

commit 74d905d2: Input: atmel_mxt_ts - only read messages in
mxt_acquire_irq() when necessary

breaks the touchpad and touchscreen of the 2015 Chromebook Pixel "Samus".

Reverting the commit from the current git tree gets them to work again.

I am not at all shure what info to include, but I will happily provide
it on request.

The dmesgs of a boot with commit 74d905d2 show "Enabling RETRIGEN
workaround", but otherwise looks the same as a boot without.

Here is the relevant bit (with 74d905d2):

atmel_mxt_ts i2c-ATML0000:01: Family: 164 Variant: 17 Firmware V1.0.AA
Objects: 32
atmel_mxt_ts i2c-ATML0000:01: Enabling RETRIGEN workaround
atmel_mxt_ts i2c-ATML0000:01: Direct firmware load for maxtouch.cfg
failed with error -2
atmel_mxt_ts i2c-ATML0000:01: Touchscreen size X960Y540
input: Atmel maXTouch Touchpad as
/devices/pci0000:00/INT3432:00/i2c-0/i2c-ATML0000:01/input/input4
atmel_mxt_ts i2c-ATML0001:01: Family: 164 Variant: 13 Firmware V1.0.AA
Objects: 41
atmel_mxt_ts i2c-ATML0001:01: Enabling RETRIGEN workaround
atmel_mxt_ts i2c-ATML0001:01: Direct firmware load for maxtouch.cfg
failed with error -2

Thank you,
Andre Müller