linux-kernel - [PATCH RESEND v4 0/2] Fix Goodix touchscreen power leakage for MT8186 boards

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Message-ID: <20230524114233.RESEND.v4.2.I424e840ae6de3cdbd67394cf4efd24534f6434ba@changeid>
Date:   Wed, 24 May 2023 11:42:35 +0800
From:   Fei Shao <fshao@...omium.org>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jeff LaBundy <jeff@...undy.com>,
        Douglas Anderson <dianders@...omium.org>,
        Fei Shao <fshao@...omium.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Conor Dooley <conor+dt@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        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 RESEND v4 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.

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

Changes in v4:
- Rebase on top of next-20230523
- Collect the review tags
- Minor coding style improvement

Changes in v3:
- In power-down, only skip the GPIO but not the regulator calls if the
  flag is set

Changes in v2:
- Use a more accurate property name and with "goodix," prefix
- Drop the change to regulator_enable logic during power-up

Fei Shao (2):
  dt-bindings: input: goodix: Add "goodix,no-reset-during-suspend"
    property
  HID: i2c-hid: goodix: Add support for "goodix,no-reset-during-suspend"
    property

 .../bindings/input/goodix,gt7375p.yaml           |  9 +++++++++
 drivers/hid/i2c-hid/i2c-hid-of-goodix.c          | 16 +++++++++++++++-
 2 files changed, 24 insertions(+), 1 deletion(-)

-- 
2.40.1.698.g37aff9b760-goog