linux-kernel - [PATCH v3 0/5] clk/qcom: Support gdsc collapse polling using 'reset' inteface

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Message-ID: <1660853919-987-1-git-send-email-quic_akhilpo@quicinc.com>
Date:   Fri, 19 Aug 2022 01:48:34 +0530
From:   Akhil P Oommen <quic_akhilpo@...cinc.com>
To:     freedreno <freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        Rob Clark <robdclark@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        "Stephen Boyd" <swboyd@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     Douglas Anderson <dianders@...omium.org>,
        <krzysztof.kozlowski@...aro.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v3 0/5] clk/qcom: Support gdsc collapse polling using 'reset' inteface


Some clients like adreno gpu driver would like to ensure that its gdsc
is collapsed at hardware during a gpu reset sequence. This is because it
has a votable gdsc which could be ON due to a vote from another subsystem
like tz, hyp etc or due to an internal hardware signal. To allow
this, gpucc driver can expose an interface to the client driver using
reset framework. Using this the client driver can trigger a polling within
the gdsc driver.

This series is rebased on top of linus's master branch.

Related discussion: https://patchwork.freedesktop.org/patch/493144/

Changes in v3:
- Use pointer to const for "struct qcom_reset_ops" in qcom_reset_map (Krzysztof)

Changes in v2:
- Return error when a particular custom reset op is not implemented. (Dmitry)

Akhil P Oommen (5):
  dt-bindings: clk: qcom: Support gpu cx gdsc reset
  clk: qcom: Allow custom reset ops
  clk: qcom: gdsc: Add a reset op to poll gdsc collapse
  clk: qcom: gpucc-sc7280: Add cx collapse reset support
  arm64: dts: qcom: sc7280: Add Reset support for gpu

 arch/arm64/boot/dts/qcom/sc7280.dtsi          |  3 +++
 drivers/clk/qcom/gdsc.c                       | 23 +++++++++++++++++++----
 drivers/clk/qcom/gdsc.h                       |  7 +++++++
 drivers/clk/qcom/gpucc-sc7280.c               | 10 ++++++++++
 drivers/clk/qcom/reset.c                      | 27 +++++++++++++++++++++++++++
 drivers/clk/qcom/reset.h                      |  8 ++++++++
 include/dt-bindings/clock/qcom,gpucc-sc7280.h |  3 +++
 7 files changed, 77 insertions(+), 4 deletions(-)

-- 
2.7.4