linux-kernel - Re: [PATCH v2 1/8] clk: qcom: rcg2: Cache rate changes for parked RCGs

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Date:   Tue, 3 May 2022 18:23:18 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     agross@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        robh+dt@...nel.org, krzk+dt@...nel.org, jonathan@...ek.ca,
        tdas@...eaurora.org, anischal@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Steev Klimaszewski <steev@...i.org>
Subject: Re: [PATCH v2 1/8] clk: qcom: rcg2: Cache rate changes for parked RCGs

On Tue, 3 May 2022 at 17:01, Bjorn Andersson <bjorn.andersson@...aro.org> wrote:
>
> On Tue 03 May 08:04 CDT 2022, Robert Foss wrote:
>
> > From: Bjorn Andersson <bjorn.andersson@...aro.org>
> >
> > As GDSCs are turned on and off some associated clocks are momentarily
> > enabled for house keeping purposes. Failure to enable these clocks seems
> > to have been silently ignored in the past, but starting in SM8350 this
> > failure will prevent the GDSC to turn on.
> >
> > At least on SM8350 this operation will enable the RCG per the
> > configuration in CFG_REG. This means that the current model where the
> > current configuration is written back to CF_REG immediately after
> > parking the RCG doesn't work.
> >
> > Instead, keep track of the currently requested rate of the clock and
> > upon enabling the clock reapply the configuration per the saved rate.
> >
> > Fixes: 7ef6f11887bd ("clk: qcom: Configure the RCGs to a safe source as needed")
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > Reviewed-by: Vinod Koul <vkoul@...nel.org>
> > Tested-by: Steev Klimaszewski <steev@...i.org>
> > ---
>
> This patch has been iterated since and the latest incarnation can be
> found on below link. A reference to that in the cover letter would be
> sufficient.
>
> https://lore.kernel.org/linux-arm-msm/20220426212136.1543984-1-bjorn.andersson@linaro.org/
>

Will do, thanks!