linux-kernel - Re: [RESEND PATCH v2 1/2] cpufreq: qcom-nvmem: add support for IPQ8074

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Message-ID: <b565b9b5-d7c1-7779-532e-565c3f5c5cd3@quicinc.com>
Date:   Thu, 1 Jun 2023 18:25:51 +0530
From:   Kathiravan T <quic_kathirav@...cinc.com>
To:     Robert Marko <robimarko@...il.com>, <rafael@...nel.org>,
        <viresh.kumar@...aro.org>, <agross@...nel.org>,
        <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <ilia.lin@...nel.org>, <linux-pm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
CC:     <ansuelsmth@...il.com>
Subject: Re: [RESEND PATCH v2 1/2] cpufreq: qcom-nvmem: add support for
 IPQ8074


On 5/30/2023 10:28 PM, Robert Marko wrote:
> IPQ8074 comes in 2 families:
> * IPQ8070A/IPQ8071A (Acorn) up to 1.4GHz
> * IPQ8072A/IPQ8074A/IPQ8076A/IPQ8078A (Hawkeye) up to 2.2GHz
>
> So, in order to be able to share one OPP table lets add support for IPQ8074
> family based of SMEM SoC ID-s as speedbin fuse is always 0 on IPQ8074.
>
> IPQ8074 compatible is blacklisted from DT platdev as the cpufreq device
> will get created by NVMEM CPUFreq driver.
>
> Signed-off-by: Robert Marko <robimarko@...il.com>
> ---
> Changes in v2:
> * Print an error if SMEM ID is not part of the IPQ8074 family
> and restrict the speed to Acorn variant (1.4GHz)
> ---
>   drivers/cpufreq/cpufreq-dt-platdev.c |  1 +
>   drivers/cpufreq/qcom-cpufreq-nvmem.c | 43 ++++++++++++++++++++++++++++
>   2 files changed, 44 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> index ea86c9f3ed7a..78f6ff933f93 100644
> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> @@ -170,6 +170,7 @@ static const struct of_device_id blocklist[] __initconst = {
>   	{ .compatible = "ti,am62a7", },
>   
>   	{ .compatible = "qcom,ipq8064", },
> +	{ .compatible = "qcom,ipq8074", },
>   	{ .compatible = "qcom,apq8064", },
>   	{ .compatible = "qcom,msm8974", },
>   	{ .compatible = "qcom,msm8960", },
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index a88b6fe5db50..ce444b5962f2 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -31,6 +31,9 @@
>   
>   #include <dt-bindings/arm/qcom,ids.h>
>   
> +#define IPQ8074_HAWKEYE_VERSION		BIT(0)
> +#define IPQ8074_ACORN_VERSION		BIT(1)
> +
>   struct qcom_cpufreq_drv;
>   
>   struct qcom_cpufreq_match_data {
> @@ -204,6 +207,41 @@ static int qcom_cpufreq_krait_name_version(struct device *cpu_dev,
>   	return ret;
>   }
>   
> +static int qcom_cpufreq_ipq8074_name_version(struct device *cpu_dev,
> +					     struct nvmem_cell *speedbin_nvmem,
> +					     char **pvs_name,
> +					     struct qcom_cpufreq_drv *drv)


Most of the IPQ SoCs also supports the fuse based frequency selection. 
Can we rename the function name to generic so that all the IPQ chips can 
use the same function?


> +{
> +	u32 msm_id;


soc_id please...?


> +	int ret;
> +	*pvs_name = NULL;
> +
> +	ret = qcom_smem_get_soc_id(&msm_id);
> +	if (ret)
> +		return ret;
> +
> +	switch (msm_id) {
> +	case QCOM_ID_IPQ8070A:
> +	case QCOM_ID_IPQ8071A:
> +		drv->versions = IPQ8074_ACORN_VERSION;
> +		break;
> +	case QCOM_ID_IPQ8072A:
> +	case QCOM_ID_IPQ8074A:
> +	case QCOM_ID_IPQ8076A:
> +	case QCOM_ID_IPQ8078A:
> +		drv->versions = IPQ8074_HAWKEYE_VERSION;
> +		break;
> +	default:
> +		dev_err(cpu_dev,
> +			"SoC ID %u is not part of IPQ8074 family, limiting to 1.4GHz!\n",
> +			msm_id);
> +		drv->versions = IPQ8074_ACORN_VERSION;
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
>   static const struct qcom_cpufreq_match_data match_data_kryo = {
>   	.get_version = qcom_cpufreq_kryo_name_version,
>   };
> @@ -218,6 +256,10 @@ static const struct qcom_cpufreq_match_data match_data_qcs404 = {
>   	.genpd_names = qcs404_genpd_names,
>   };
>   
> +static const struct qcom_cpufreq_match_data match_data_ipq8074 = {
> +	.get_version = qcom_cpufreq_ipq8074_name_version,
> +};
> +
>   static int qcom_cpufreq_probe(struct platform_device *pdev)
>   {
>   	struct qcom_cpufreq_drv *drv;
> @@ -363,6 +405,7 @@ static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
>   	{ .compatible = "qcom,msm8996", .data = &match_data_kryo },
>   	{ .compatible = "qcom,qcs404", .data = &match_data_qcs404 },
>   	{ .compatible = "qcom,ipq8064", .data = &match_data_krait },
> +	{ .compatible = "qcom,ipq8074", .data = &match_data_ipq8074 },
>   	{ .compatible = "qcom,apq8064", .data = &match_data_krait },
>   	{ .compatible = "qcom,msm8974", .data = &match_data_krait },
>   	{ .compatible = "qcom,msm8960", .data = &match_data_krait },