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

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Date:   Tue, 9 Aug 2022 16:05:43 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Akhil P Oommen <quic_akhilpo@...cinc.com>
Cc:     freedreno <freedreno@...ts.freedesktop.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...il.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        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: Re: [PATCH 0/5] clk/qcom: Support gdsc collapse polling using
 'reset' inteface

On Sat 30 Jul 04:17 CDT 2022, Akhil P Oommen wrote:

> 
> 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/
> 

Forgive me if I'm assuming too much, but isn't this an extension of:

85a3d920d30a ("clk: qcom: Add a dummy enable function for GX gdsc")

With the additional requirement that disable should really ensure that
the GDSC is turned off?

Regards,
Bjorn

> 
> Akhil P Oommen (5):
>   dt-bindings: clk: qcom: Support gpu cx gdsc reset
>   clk: qcom: Allow custom reset ops
>   clk: qcom: gpucc-sc7280: Add cx collapse reset support
>   clk: qcom: gdsc: Add a reset op to poll gdsc collapse
>   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               |  6 ++++++
>  drivers/clk/qcom/reset.c                      |  6 ++++++
>  drivers/clk/qcom/reset.h                      |  2 ++
>  include/dt-bindings/clock/qcom,gpucc-sc7280.h |  3 +++
>  7 files changed, 46 insertions(+), 4 deletions(-)
> 
> -- 
> 2.7.4
>