linux-kernel - Re: [PATCH v4 11/11] arm64: dts: qcom: sc7180: Link trogdor touchscreens to the panels

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Date:   Thu, 14 Sep 2023 16:42:47 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>
Cc:     linux-arm-msm@...r.kernel.org,
        yangcong5@...qin.corp-partner.google.com,
        devicetree@...r.kernel.org, Daniel Vetter <daniel@...ll.ch>,
        hsinyi@...gle.com, Chris Morgan <macroalpha82@...il.com>,
        linux-input@...r.kernel.org, cros-qcom-dts-watchers@...omium.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v4 11/11] arm64: dts: qcom: sc7180: Link trogdor
 touchscreens to the panels

Hi,

On Thu, Jul 27, 2023 at 10:19 AM Douglas Anderson <dianders@...omium.org> wrote:
>
> Let's provide the proper link from the touchscreen to the panel on
> trogdor devices where the touchscreen support it. This allows the OS
> to power sequence the touchscreen more properly.
>
> For the most part, this is just expected to marginally improve power
> consumption while the screen is off. However, in at least one trogdor
> model (wormdingler) it's suspected that this will fix some behavorial
> corner cases when the panel power cycles (like for a modeset) without
> the touchscreen power cycling.
>
> NOTE: some trogdor variants use touchscreens that don't (yet) support
> linking the touchscreen and the panel. Those variants are left alone.
>
> Reviewed-by: Maxime Ripard <mripard@...nel.org>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
> (no changes since v1)
>
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-coachz.dtsi        | 1 +
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-homestar.dtsi      | 1 +
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-lazor.dtsi         | 1 +
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-pompom.dtsi        | 1 +
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-quackingstick.dtsi | 1 +
>  arch/arm64/boot/dts/qcom/sc7180-trogdor-wormdingler.dtsi   | 1 +
>  6 files changed, 6 insertions(+)

FWIW, this old patch could land any time. All the earlier patches in
the series have landed.

-Doug