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

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Date:   Thu, 6 Jan 2022 10:52:49 -0500
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...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 1/5/22 4:52 PM, Bjorn Andersson wrote:
> 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.

Sure.. I will fix this and the comment below and send out v3.

-- 
Warm Regards
Thara (She/Her/Hers)
> 
>> +
>> +	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
>>