linux-kernel - [PATCH v7 0/6] clk/qcom: Support gdsc collapse polling using 'reset' interface

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Message-ID: <1664960824-20951-1-git-send-email-quic_akhilpo@quicinc.com>
Date:   Wed, 5 Oct 2022 14:36:58 +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 <andersson@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     Douglas Anderson <dianders@...omium.org>,
        <krzysztof.kozlowski@...aro.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        "Konrad Dybcio" <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>, Sean Paul <sean@...rly.run>,
        Stephen Boyd <sboyd@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v7 0/6] clk/qcom: Support gdsc collapse polling using 'reset' interface


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 qcom/linux:for-next branch.

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

Changes in v7:
- Update commit message (Bjorn)
- Rebased on top of qcom/linux:for-next branch.

Changes in v6:
- No code changes in this version. Just captured the Acked-by tags

Changes in v5:
- Nit: Remove a duplicate blank line (Krzysztof)

Changes in v4:
- Update gpu dt-binding schema
- Typo fix in commit text

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 (6):
  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
  dt-bindings: drm/msm/gpu: Add optional resets
  arm64: dts: qcom: sc7280: Add Reset support for gpu

 .../devicetree/bindings/display/msm/gpu.yaml       |  6 +++++
 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 +++
 8 files changed, 82 insertions(+), 5 deletions(-)

-- 
2.7.4