linux-kernel - [PATCH v3 0/4] arm64: dts: qcom: sc7180: Make pazquel360's touchscreen work

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Message-Id: <20221209171240.1614904-1-dianders@chromium.org>
Date:   Fri,  9 Dec 2022 09:12:36 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     Bjorn Andersson <andersson@...nel.org>
Cc:     swboyd@...omium.org, Dmitry Torokhov <dmitry.torokhov@...il.com>,
        mka@...omium.org, Yunlong Jia <ecs.beijing2022@...il.com>,
        linux-arm-msm@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-input@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/4] arm64: dts: qcom: sc7180: Make pazquel360's touchscreen work

This series of patches adds / fixes problems with pazquel360's
touchscreen. A few notes here:

1. Originally the touchscreen was supposed to be added as part of the
first landing of the pazquel360 device tree. ...but the fact that
Yunlong changed email addresses seems to have messed up Bjorn's
scripts. What landed was v3 [1] instead of v5 [2]. The pazquel360 part
of this series is that diff (minus the incorrect 'hid-descr-addr' property).

2. We delayed sending the fixup till now because soon after the series
landed upstream we found that some laptops were having trouble
initting the touchscreen in cases where the eDP/touchscreen regulator
was left on by the bootloader. We've been struggling to make sense of
all of this. As part of this investigation we landed a85fbd649844
("Input: elants_i2c - properly handle the reset GPIO when power is
off") but that wasn't enough. That fix, together with the fixes in
this series, is enough though.

3. In v1 and v2, this series included an elan driver patch too. That's
landed, so v3 is just device tree stuff. It turns out that with
_just_ the device tree changes things are actually working OK but
the timing is tight, so getting a little extra breathing room
from the Linux driver was nice.

4. Despite the fact that we did debugging here on pazquel360, many of
the changes here are made in general for trogdor devices. I believe
that this will make the timing more correct on those devices even if
we weren't actually seeing problems.

[1] https://lore.kernel.org/r/20220901024827.v3.2.Iea2d2918adfff2825b87d428b5732717425c196f@changeid
[2] https://lore.kernel.org/r/20220923083657.v5.3.Iea2d2918adfff2825b87d428b5732717425c196f@changeid

Changes in v3:
- Removed hid-descr-addr

Changes in v2:
- Fix typo in commit message (Matthias)

Douglas Anderson (4):
  arm64: dts: qcom: sc7180: Bump up trogdor ts_reset_l drive strength
  arm64: dts: qcom: sc7180: Add trogdor eDP/touchscreen regulator
    off-on-time
  arm64: dts: qcom: sc7180: Start the trogdor eDP/touchscreen regulator
    on
  arm64: dts: qcom: sc7180: Add pazquel360 touschreen

 .../dts/qcom/sc7180-trogdor-homestar.dtsi     | 18 +++++++++++++++++
 .../qcom/sc7180-trogdor-parade-ps8640.dtsi    | 20 +++++++++++++++++++
 .../dts/qcom/sc7180-trogdor-pazquel360.dtsi   | 19 ++++++++++++++++++
 .../dts/qcom/sc7180-trogdor-ti-sn65dsi86.dtsi | 20 +++++++++++++++++++
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi  | 10 +++++++++-
 5 files changed, 86 insertions(+), 1 deletion(-)

-- 
2.39.0.rc1.256.g54fd8350bd-goog