linux-kernel - Re: [PATCH v7 4/8] clk: qcom: videocc-sm8250: use runtime PM for the clock controller

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Date:   Thu, 7 Oct 2021 08:10:17 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Taniya Das <tdas@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Michael Turquette <mturquette@...libre.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 4/8] clk: qcom: videocc-sm8250: use runtime PM for the
 clock controller

On Sun 29 Aug 08:47 PDT 2021, Dmitry Baryshkov wrote:

> On sm8250 dispcc and videocc registers are powered up by the MMCX power
> domain. Use runtime PM calls to make sure that required power domain is
> powered on while we access clock controller's registers.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/clk/qcom/videocc-sm8250.c | 27 +++++++++++++++++++++++++--
>  1 file changed, 25 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/qcom/videocc-sm8250.c b/drivers/clk/qcom/videocc-sm8250.c
> index 7b435a1c2c4b..8617454e4a77 100644
> --- a/drivers/clk/qcom/videocc-sm8250.c
> +++ b/drivers/clk/qcom/videocc-sm8250.c
> @@ -6,6 +6,7 @@
>  #include <linux/clk-provider.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/regmap.h>
>  
>  #include <dt-bindings/clock/qcom,videocc-sm8250.h>
> @@ -364,13 +365,31 @@ static const struct of_device_id video_cc_sm8250_match_table[] = {
>  };
>  MODULE_DEVICE_TABLE(of, video_cc_sm8250_match_table);
>  
> +static void video_cc_sm8250_pm_runtime_disable(void *data)
> +{
> +	pm_runtime_disable(data);
> +}
> +
>  static int video_cc_sm8250_probe(struct platform_device *pdev)
>  {
>  	struct regmap *regmap;
> +	int ret;
> +
> +	pm_runtime_enable(&pdev->dev);
> +
> +	ret = devm_add_action_or_reset(&pdev->dev, video_cc_sm8250_pm_runtime_disable, &pdev->dev);
> +	if (ret)
> +		return ret;
> +
> +	ret = pm_runtime_resume_and_get(&pdev->dev);
> +	if (ret)
> +		return ret;
>  
>  	regmap = qcom_cc_map(pdev, &video_cc_sm8250_desc);
> -	if (IS_ERR(regmap))
> +	if (IS_ERR(regmap)) {
> +		pm_runtime_put(&pdev->dev);
>  		return PTR_ERR(regmap);
> +	}
>  
>  	clk_lucid_pll_configure(&video_pll0, regmap, &video_pll0_config);
>  	clk_lucid_pll_configure(&video_pll1, regmap, &video_pll1_config);
> @@ -379,7 +398,11 @@ static int video_cc_sm8250_probe(struct platform_device *pdev)
>  	regmap_update_bits(regmap, 0xe58, BIT(0), BIT(0));
>  	regmap_update_bits(regmap, 0xeec, BIT(0), BIT(0));
>  
> -	return qcom_cc_really_probe(pdev, &video_cc_sm8250_desc, regmap);
> +	ret = qcom_cc_really_probe(pdev, &video_cc_sm8250_desc, regmap);
> +
> +	pm_runtime_put(&pdev->dev);
> +
> +	return ret;
>  }
>  
>  static struct platform_driver video_cc_sm8250_driver = {
> -- 
> 2.33.0
>