linux-kernel - Re: [PATCH] remoteproc: qcom_q6v5_pas: Deal silently with optional px and cx regulators

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Date:   Wed, 13 Jul 2022 22:15:25 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Abel Vesa <abel.vesa@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: qcom_q6v5_pas: Deal silently with optional
 px and cx regulators

On Wed, Jul 13, 2022 at 06:28:35PM +0300, Abel Vesa wrote:
> Use _get_optional as some platforms might not provide the px
> and cx regulators.

But this makes no failure for platforms that really needs these regulators and
not defined in devicetree. But at the same time, the driver should trust
the devicetree anyway and not try to validate it.

So I think this is fine.

> This avoids printing the following for each
> unavailable regulator:
> 
> [    4.350229] qcom_q6v5_pas 5c00000.remoteproc: supply cx not found,
> using dummy regulator
> [    4.374224] qcom_q6v5_pas 5c00000.remoteproc: supply px not found,
> using dummy regulator
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  drivers/remoteproc/qcom_q6v5_pas.c | 32 +++++++++++++++++++-----------
>  1 file changed, 20 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index 6ae39c5653b1..3c3affaff7ac 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -185,13 +185,17 @@ static int adsp_start(struct rproc *rproc)
>  	if (ret)
>  		goto disable_xo_clk;
>  
> -	ret = regulator_enable(adsp->cx_supply);
> -	if (ret)
> -		goto disable_aggre2_clk;
> +	if (adsp->cx_supply) {
> +		ret = regulator_enable(adsp->cx_supply);
> +		if (ret)
> +			goto disable_aggre2_clk;
> +	}
>  
> -	ret = regulator_enable(adsp->px_supply);
> -	if (ret)
> -		goto disable_cx_supply;
> +	if (adsp->px_supply) {
> +		ret = regulator_enable(adsp->px_supply);
> +		if (ret)
> +			goto disable_cx_supply;
> +	}
>  
>  	ret = qcom_scm_pas_auth_and_reset(adsp->pas_id);
>  	if (ret) {
> @@ -212,9 +216,11 @@ static int adsp_start(struct rproc *rproc)
>  	return 0;
>  
>  disable_px_supply:
> -	regulator_disable(adsp->px_supply);
> +	if (adsp->px_supply)
> +		regulator_disable(adsp->px_supply);
>  disable_cx_supply:
> -	regulator_disable(adsp->cx_supply);
> +	if (adsp->cx_supply)
> +		regulator_disable(adsp->cx_supply);
>  disable_aggre2_clk:
>  	clk_disable_unprepare(adsp->aggre2_clk);
>  disable_xo_clk:
> @@ -231,8 +237,10 @@ static void qcom_pas_handover(struct qcom_q6v5 *q6v5)
>  {
>  	struct qcom_adsp *adsp = container_of(q6v5, struct qcom_adsp, q6v5);
>  
> -	regulator_disable(adsp->px_supply);
> -	regulator_disable(adsp->cx_supply);
> +	if (adsp->px_supply)
> +		regulator_disable(adsp->px_supply);
> +	if (adsp->cx_supply)
> +		regulator_disable(adsp->cx_supply);
>  	clk_disable_unprepare(adsp->aggre2_clk);
>  	clk_disable_unprepare(adsp->xo);
>  	adsp_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
> @@ -326,13 +334,13 @@ static int adsp_init_clock(struct qcom_adsp *adsp)
>  
>  static int adsp_init_regulator(struct qcom_adsp *adsp)
>  {
> -	adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
> +	adsp->cx_supply = devm_regulator_get_optional(adsp->dev, "cx");
>  	if (IS_ERR(adsp->cx_supply))
>  		return PTR_ERR(adsp->cx_supply);
>  
>  	regulator_set_load(adsp->cx_supply, 100000);
>  
> -	adsp->px_supply = devm_regulator_get(adsp->dev, "px");
> +	adsp->px_supply = devm_regulator_get_optional(adsp->dev, "px");
>  	return PTR_ERR_OR_ZERO(adsp->px_supply);
>  }
>  
> -- 
> 2.34.3
>