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

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Date:   Sat, 27 May 2023 17:56:06 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Robert Marko <robimarko@...il.com>, ilia.lin@...nel.org,
        agross@...nel.org, andersson@...nel.org, rafael@...nel.org,
        viresh.kumar@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     ansuelsmth@...il.com
Subject: Re: [PATCH 2/2] cpufreq: qcom-nvmem: add support for IPQ8074



On 27.05.2023 11:52, 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>
> ---
>  drivers/cpufreq/cpufreq-dt-platdev.c |  1 +
>  drivers/cpufreq/qcom-cpufreq-nvmem.c | 40 ++++++++++++++++++++++++++++
>  2 files changed, 41 insertions(+)
> 
> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> index 14aa8281c7f4..e4d6d128647d 100644
> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> @@ -169,6 +169,7 @@ static const struct of_device_id blocklist[] __initconst = {
>  	{ .compatible = "ti,am625", },
>  
>  	{ .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..607fc0273e9c 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 +207,38 @@ 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)
> +{
> +	u32 msm_id;
> +	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:
> +		BUG();
I'd say pr_err, or at least WARN() + setting the slowest bin would be
more desirable here, cpufreq probes early so people without uart etc.
will be unlikely to find out why their kernel dies.

Konrad
> +		break;
> +	}
> +
> +	return 0;
> +}
> +
>  static const struct qcom_cpufreq_match_data match_data_kryo = {
>  	.get_version = qcom_cpufreq_kryo_name_version,
>  };
> @@ -218,6 +253,10 @@ 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 +402,7 @@ 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 },