linux-kernel - Re: [Patch v2 1/3] thermal: qcom: lmh: Add support for sm8150

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Date:   Wed, 5 Jan 2022 13:52:22 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Thara Gopinath <thara.gopinath@...aro.org>
Cc:     agross@...nel.org, daniel.lezcano@...aro.org, rafael@...nel.org,
        rui.zhang@...el.com, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v2 1/3] thermal: qcom: lmh: Add support for sm8150

On Wed 15 Dec 08:33 PST 2021, Thara Gopinath wrote:

> Add compatible to support LMh for sm8150 SoC.
> sm8150 does not require explicit enabling for various LMh subsystems.
> Add a variable indicating the same as match data which is set for sdm845.
> Execute the piece of code enabling various LMh subsystems only if
> enable algorithm match data is present.
> 
> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
> ---
> 
> v1->v2:
> 	- Added LMH_ENABLE_ALGOS of_device_id match data to indicate
> 	  whether LMh subsytems need explicit enabling or not.
> 
>  drivers/thermal/qcom/lmh.c | 62 +++++++++++++++++++++-----------------
>  1 file changed, 35 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/lmh.c b/drivers/thermal/qcom/lmh.c
> index eafa7526eb8b..80d26d043498 100644
> --- a/drivers/thermal/qcom/lmh.c
> +++ b/drivers/thermal/qcom/lmh.c
> @@ -28,6 +28,8 @@
>  
>  #define LMH_REG_DCVS_INTR_CLR		0x8
>  
> +#define LMH_ENABLE_ALGOS		((void *)1)
> +
>  struct lmh_hw_data {
>  	void __iomem *base;
>  	struct irq_domain *domain;
> @@ -87,6 +89,7 @@ static int lmh_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct device_node *np = dev->of_node;
> +	const struct of_device_id *of_id;
>  	struct device_node *cpu_node;
>  	struct lmh_hw_data *lmh_data;
>  	int temp_low, temp_high, temp_arm, cpu_id, ret;
> @@ -141,32 +144,36 @@ static int lmh_probe(struct platform_device *pdev)
>  	if (!qcom_scm_lmh_dcvsh_available())
>  		return -EINVAL;
>  
> -	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_CRNT, LMH_ALGO_MODE_ENABLE, 1,
> -				 LMH_NODE_DCVS, node_id, 0);
> -	if (ret)
> -		dev_err(dev, "Error %d enabling current subfunction\n", ret);
> -
> -	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_REL, LMH_ALGO_MODE_ENABLE, 1,
> -				 LMH_NODE_DCVS, node_id, 0);
> -	if (ret)
> -		dev_err(dev, "Error %d enabling reliability subfunction\n", ret);
> -
> -	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_BCL, LMH_ALGO_MODE_ENABLE, 1,
> -				 LMH_NODE_DCVS, node_id, 0);
> -	if (ret)
> -		dev_err(dev, "Error %d enabling BCL subfunction\n", ret);
> -
> -	ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_ALGO_MODE_ENABLE, 1,
> -				 LMH_NODE_DCVS, node_id, 0);
> -	if (ret) {
> -		dev_err(dev, "Error %d enabling thermal subfunction\n", ret);
> -		return ret;
> -	}
> -
> -	ret = qcom_scm_lmh_profile_change(0x1);
> -	if (ret) {
> -		dev_err(dev, "Error %d changing profile\n", ret);
> -		return ret;
> +	of_id = of_match_device(dev->driver->of_match_table, dev);

I think it would be preferable to use of_device_get_match_data() and
assign this to an unsigned long.

> +
> +	if (of_id && of_id->data == LMH_ENABLE_ALGOS) {

Then you don't need to check of_id for NULL here and this would lend
itself nicely to be a bitmask of enabled algorithms if some platform
would need to enable a subset of these.

> +		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_CRNT, LMH_ALGO_MODE_ENABLE, 1,
> +					 LMH_NODE_DCVS, node_id, 0);
> +		if (ret)
> +			dev_err(dev, "Error %d enabling current subfunction\n", ret);
> +
> +		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_REL, LMH_ALGO_MODE_ENABLE, 1,
> +					 LMH_NODE_DCVS, node_id, 0);
> +		if (ret)
> +			dev_err(dev, "Error %d enabling reliability subfunction\n", ret);
> +
> +		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_BCL, LMH_ALGO_MODE_ENABLE, 1,
> +					 LMH_NODE_DCVS, node_id, 0);
> +		if (ret)
> +			dev_err(dev, "Error %d enabling BCL subfunction\n", ret);
> +
> +		ret = qcom_scm_lmh_dcvsh(LMH_SUB_FN_THERMAL, LMH_ALGO_MODE_ENABLE, 1,
> +					 LMH_NODE_DCVS, node_id, 0);
> +		if (ret) {
> +			dev_err(dev, "Error %d enabling thermal subfunction\n", ret);
> +			return ret;
> +		}
> +
> +		ret = qcom_scm_lmh_profile_change(0x1);
> +		if (ret) {
> +			dev_err(dev, "Error %d changing profile\n", ret);
> +			return ret;
> +		}
>  	}
>  
>  	/* Set default thermal trips */
> @@ -213,7 +220,8 @@ static int lmh_probe(struct platform_device *pdev)
>  }
>  
>  static const struct of_device_id lmh_table[] = {
> -	{ .compatible = "qcom,sdm845-lmh", },
> +	{ .compatible = "qcom,sdm845-lmh", .data = LMH_ENABLE_ALGOS},

Make LMH_ENABLE_ALGOS just an integer define and add the explicit (void
*) cast here.

Regards,
Bjorn

> +	{ .compatible = "qcom,sm8150-lmh", },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, lmh_table);
> -- 
> 2.25.1
>