linux-kernel - [PATCH 0/2] Fix Goodix touchscreen power leakage for MT8186 boards

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Message-ID: <20230418124953.3170028-1-fshao@chromium.org>
Date:   Tue, 18 Apr 2023 20:49:50 +0800
From:   Fei Shao <fshao@...omium.org>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Douglas Anderson <dianders@...omium.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-mediatek <linux-mediatek@...ts.infradead.org>,
        Fei Shao <fshao@...omium.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jiri Kosina <jikos@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Stephen Kitt <steve@....org>, devicetree@...r.kernel.org,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] Fix Goodix touchscreen power leakage for MT8186 boards

These changes are based on the series in [1], which modified the
i2c-hid-of-goodix driver and removed the workaround for a power leakage
issue, so the issue revisits on Mediatek MT8186 boards (Steelix).

The root cause is that the touchscreen can be powered in different ways
depending on the hardware designs, and it's not as easy to come up with
a solution that is both simple and elegant for all the known designs.

To address the issue, I ended up adding a new boolean property for the
driver so that we can control the power up/down sequence depending on
that.

Adding a new property might not be the cleanest approach for this, but
at least the intention would be easy enough to understand, and it
introduces relatively small change to the code and fully preserves the
original control flow.
I hope this is something acceptable, and I'm open to any better
approaches.

[1] https://lore.kernel.org/all/20230207024816.525938-1-dianders@chromium.org/

Fei Shao (2):
  dt-bindings: input: goodix: Add powered-in-suspend property
  HID: i2c-hid: goodix: Add support for powered-in-suspend property

 .../bindings/input/goodix,gt7375p.yaml        |  6 +++
 drivers/hid/i2c-hid/i2c-hid-of-goodix.c       | 46 ++++++++++++++++---
 2 files changed, 45 insertions(+), 7 deletions(-)

-- 
2.40.0.634.g4ca3ef3211-goog