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

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Date:   Wed, 7 Jun 2023 08:55:25 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Fei Shao <fshao@...omium.org>, Jiri Kosina <jikos@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jeff LaBundy <jeff@...undy.com>,
        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: Re: [PATCH RESEND v4 0/2] Fix Goodix touchscreen power leakage for
 MT8186 boards

Hi Jiri

On Tue, May 23, 2023 at 8:45 PM Fei Shao <fshao@...omium.org> wrote:
>
> 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(-)

Just confirming that you're good to land these two patches as
discussed previously [1]. Thanks! :-)


[1] https://lore.kernel.org/r/nycvar.YFH.7.76.2305231510270.29760@cbobk.fhfr.pm