linux-kernel - Re: [PATCH 2/8] clk: qcom: gdsc: Enable supply reglator in GPU GX handler

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Date: Wed, 20 Dec 2023 20:36:23 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, Bjorn Andersson <quic_bjorande@...cinc.com>, Catalin Marinas <catalin.marinas@....com>, Conor Dooley <conor+dt@...nel.org>, Johan Hovold <johan+linaro@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Michael Turquette <mturquette@...libre.com>, Rob Herring <robh+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>, Ulf Hansson <ulf.hansson@...aro.org>, Will Deacon <will@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Bjorn Andersson <quic_bjorande@...cinc.com>
Subject: Re: [PATCH 2/8] clk: qcom: gdsc: Enable supply reglator in GPU GX handler

Quoting Bjorn Andersson (2023-12-20 19:50:36)
> The GX GDSC is modelled to aid the GMU in powering down the GPU in the
> event that the GPU crashes, so that it can be restarted again. But in
> the event that the power-domain is supplied through a dedicated
> regulator (in contrast to being a subdomin of another power-domain),
> something needs to turn that regulator on, both to make sure things are
> powered and to match the operation in gdsc_disable().
> 
> Signed-off-by: Bjorn Andersson <quic_bjorande@...cinc.com>
> ---
>  drivers/clk/qcom/gdsc.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
> index 5358e28122ab..d1139c895503 100644
> --- a/drivers/clk/qcom/gdsc.c
> +++ b/drivers/clk/qcom/gdsc.c
> @@ -557,7 +557,13 @@ void gdsc_unregister(struct gdsc_desc *desc)
>   */
>  int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain)
>  {
> +       struct gdsc *sc = domain_to_gdsc(domain);
> +       int ret = 0;
> +
>         /* Do nothing but give genpd the impression that we were successful */

Update this comment.

> -       return 0;
> +       if (sc->rsupply)
> +               ret = regulator_enable(sc->rsupply);
> +
> +       return ret;
>  }