linux-kernel - Re: [PATCH 7/8] clk: qcom: gcc-sm8150: use runtime PM for the clock controller

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Date:   Thu, 27 Jan 2022 01:34:14 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org, agross@...nel.org, sboyd@...nel.org,
        tdas@...eaurora.org, mturquette@...libre.com,
        linux-clk@...r.kernel.org, bjorn.andersson@...aro.org,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 7/8] clk: qcom: gcc-sm8150: use runtime PM for the clock controller

On Thu, 27 Jan 2022 at 01:19, Bhupesh Sharma <bhupesh.sharma@...aro.org> wrote:
>
> On sm8150 emac clk registers are powered up by the GDSC power
> domain. Use runtime PM calls to make sure that required power domain is
> powered on while we access clock controller's registers.
>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
>  drivers/clk/qcom/gcc-sm8150.c | 27 +++++++++++++++++++++++++--
>  1 file changed, 25 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/clk/qcom/gcc-sm8150.c b/drivers/clk/qcom/gcc-sm8150.c
> index ada755ad55f7..2e71afed81fd 100644
> --- a/drivers/clk/qcom/gcc-sm8150.c
> +++ b/drivers/clk/qcom/gcc-sm8150.c
> @@ -5,6 +5,7 @@
>  #include <linux/bitops.h>
>  #include <linux/err.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> @@ -3792,19 +3793,41 @@ static const struct of_device_id gcc_sm8150_match_table[] = {
>  };
>  MODULE_DEVICE_TABLE(of, gcc_sm8150_match_table);
>
> +static void gcc_sm8150_pm_runtime_disable(void *data)
> +{
> +       pm_runtime_disable(data);
> +}
> +
>  static int gcc_sm8150_probe(struct platform_device *pdev)
>  {
>         struct regmap *regmap;
> +       int ret;
> +
> +       pm_runtime_enable(&pdev->dev);
> +
> +       ret = devm_add_action_or_reset(&pdev->dev, gcc_sm8150_pm_runtime_disable, &pdev->dev);
> +       if (ret)
> +               return ret;

Please use devm_pm_runtime_enable() instead.

> +
> +       ret = pm_runtime_resume_and_get(&pdev->dev);
> +       if (ret)
> +               return ret;
>
>         regmap = qcom_cc_map(pdev, &gcc_sm8150_desc);
> -       if (IS_ERR(regmap))
> +       if (IS_ERR(regmap)) {
> +               pm_runtime_put(&pdev->dev);
>                 return PTR_ERR(regmap);
> +       }
>
>         /* Disable the GPLL0 active input to NPU and GPU via MISC registers */
>         regmap_update_bits(regmap, 0x4d110, 0x3, 0x3);
>         regmap_update_bits(regmap, 0x71028, 0x3, 0x3);
>
> -       return qcom_cc_really_probe(pdev, &gcc_sm8150_desc, regmap);
> +       ret = qcom_cc_really_probe(pdev, &gcc_sm8150_desc, regmap);
> +
> +       pm_runtime_put(&pdev->dev);
> +
> +       return ret;
>  }
>
>  static struct platform_driver gcc_sm8150_driver = {
> --
> 2.34.1
>


-- 
With best wishes
Dmitry