linux-kernel - Re: [PATCH 4/4] cpufreq: qcom-nvmem: make qcom_cpufreq_get_msm

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Message-ID: <d71e8a18-8a09-c722-d9dd-b2d48615828f@linaro.org>
Date:   Sat, 18 Feb 2023 15:43:05 +0100
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, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 4/4] cpufreq: qcom-nvmem: make qcom_cpufreq_get_msm_id()
 return the SoC ID



On 21.01.2023 12:29, Robert Marko wrote:
> Currently, qcom_cpufreq_get_msm_id() does not simply return the SoC ID
> after getting it via SMEM call but instead uses an enum to encode the
> matched SMEM ID to 2 variants of MSM8996 which are then used in
> qcom_cpufreq_kryo_name_version() to set the supported version.
> 
> This prevents qcom_cpufreq_get_msm_id() from being universal and its doing
> more than its name suggests, so lets make it just return the SoC ID
> directly which allows matching directly on the SoC ID and removes the need
> for msm8996_version enum which simplifies the driver.
> It also allows reusing the qcom_cpufreq_get_msm_id() for new SoC-s.
> 
> Signed-off-by: Robert Marko <robimarko@...il.com>
> ---
>  drivers/cpufreq/qcom-cpufreq-nvmem.c | 44 ++++++++--------------------
>  1 file changed, 12 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index da55d2e1925a..9deaf9521d6d 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -32,12 +32,6 @@
>  
>  #include <dt-bindings/arm/qcom,ids.h>
>  
> -enum _msm8996_version {
> -	MSM8996_V3,
> -	MSM8996_SG,
> -	NUM_OF_MSM8996_VERSIONS,
> -};
> -
>  struct qcom_cpufreq_drv;
>  
>  struct qcom_cpufreq_match_data {
> @@ -134,30 +128,16 @@ static void get_krait_bin_format_b(struct device *cpu_dev,
>  	dev_dbg(cpu_dev, "PVS version: %d\n", *pvs_ver);
>  }
>  
> -static enum _msm8996_version qcom_cpufreq_get_msm_id(void)
> +static int qcom_cpufreq_get_msm_id(void)
This should be u32 as info->id is __le32

And please export this function from socinfo, it'll come in
useful for other drivers!

Konrad
>  {
>  	size_t len;
>  	struct socinfo *info;
> -	enum _msm8996_version version;
>  
>  	info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, &len);
>  	if (IS_ERR(info))
> -		return NUM_OF_MSM8996_VERSIONS;
> +		return PTR_ERR(info);
>  
> -	switch (info->id) {
> -	case QCOM_ID_MSM8996:
> -	case QCOM_ID_APQ8096:
> -		version = MSM8996_V3;
> -		break;
> -	case QCOM_ID_MSM8996SG:
> -	case QCOM_ID_APQ8096SG:
> -		version = MSM8996_SG;
> -		break;
> -	default:
> -		version = NUM_OF_MSM8996_VERSIONS;
> -	}
> -
> -	return version;
> +	return info->id;
>  }
>  
>  static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
> @@ -166,25 +146,25 @@ static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
>  					  struct qcom_cpufreq_drv *drv)
>  {
>  	size_t len;
> +	int msm_id;
>  	u8 *speedbin;
> -	enum _msm8996_version msm8996_version;
>  	*pvs_name = NULL;
>  
> -	msm8996_version = qcom_cpufreq_get_msm_id();
> -	if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> -		dev_err(cpu_dev, "Not Snapdragon 820/821!");
> -		return -ENODEV;
> -	}
> +	msm_id = qcom_cpufreq_get_msm_id();
> +	if (msm_id < 0)
> +		return msm_id;
>  
>  	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
>  	if (IS_ERR(speedbin))
>  		return PTR_ERR(speedbin);
>  
> -	switch (msm8996_version) {
> -	case MSM8996_V3:
> +	switch (msm_id) {
> +	case QCOM_ID_MSM8996:
> +	case QCOM_ID_APQ8096:
>  		drv->versions = 1 << (unsigned int)(*speedbin);
>  		break;
> -	case MSM8996_SG:
> +	case QCOM_ID_MSM8996SG:
> +	case QCOM_ID_APQ8096SG:
>  		drv->versions = 1 << ((unsigned int)(*speedbin) + 4);
>  		break;
>  	default: