linux-kernel - Re: [PATCH V2 4/4] clk: qcom: videocc-sm8150: Add runtime PM support

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Date:   Wed, 22 Nov 2023 21:01:58 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Satya Priya Kakitapalli <quic_skakitap@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH V2 4/4] clk: qcom: videocc-sm8150: Add runtime PM support



On 11/18/23 13:39, Satya Priya Kakitapalli wrote:
> Add runtime PM support to ensure the supply rails are enabled
> when necessary.
> 
> Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
> ---
> Changes since v1:
>   - None.
> 
>   drivers/clk/qcom/videocc-sm8150.c | 20 ++++++++++++++++++--
>   1 file changed, 18 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/qcom/videocc-sm8150.c b/drivers/clk/qcom/videocc-sm8150.c
> index 52a9a453a143..b57df5ff96c4 100644
> --- a/drivers/clk/qcom/videocc-sm8150.c
> +++ b/drivers/clk/qcom/videocc-sm8150.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-sm8150.h>
> @@ -240,17 +241,32 @@ MODULE_DEVICE_TABLE(of, video_cc_sm8150_match_table);
>   static int video_cc_sm8150_probe(struct platform_device *pdev)
>   {
>   	struct regmap *regmap;
> +	int ret;
> +
> +	ret = devm_pm_runtime_enable(&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_sm8150_desc);
> -	if (IS_ERR(regmap))
> +	if (IS_ERR(regmap)) {
> +		pm_runtime_put(&pdev->dev);
Shouldn't this be _sync?

Konrad