linux-kernel - Re: [PATCH v4 5/5] cpufreq: qcom-nvmem: use helper to get SMEM SoC ID

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Message-ID: <5382b518-7691-ee70-c522-9ce0b14d60c1@linaro.org>
Date:   Fri, 26 May 2023 01:18:02 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Robert Marko <robimarko@...il.com>, agross@...nel.org,
        andersson@...nel.org, ilia.lin@...nel.org, rafael@...nel.org,
        viresh.kumar@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     ansuelsmth@...il.com
Subject: Re: [PATCH v4 5/5] cpufreq: qcom-nvmem: use helper to get SMEM SoC ID



On 25.05.2023 23:02, Robert Marko wrote:
> Now that SMEM exports a helper to get the SMEM SoC ID lets utilize it.
> Currently qcom_cpufreq_get_msm_id() is encoding the returned SMEM SoC ID
> into an enum, however there is no reason to do so and we can just match
> directly on the SMEM SoC ID as returned by qcom_smem_get_soc_id().
> 
> Signed-off-by: Robert Marko <robimarko@...il.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
> Changes in v4:
> * Adapt to name change to qcom_smem_get_soc_id()
> 
> Changes in v3:
> * Adapt to helper using argument now
> 
> Changes in v2:
> * Utilize helper exported by SMEM instead of refactoring
> qcom_cpufreq_get_msm_id()
> ---
>  drivers/cpufreq/qcom-cpufreq-nvmem.c | 56 +++++-----------------------
>  1 file changed, 10 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> index 60e99be2d3db..a88b6fe5db50 100644
> --- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
> @@ -29,16 +29,8 @@
>  #include <linux/slab.h>
>  #include <linux/soc/qcom/smem.h>
>  
> -#define MSM_ID_SMEM	137
> -
>  #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 {
> @@ -135,60 +127,32 @@ 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)
> -{
> -	size_t len;
> -	u32 *msm_id;
> -	enum _msm8996_version version;
> -
> -	msm_id = qcom_smem_get(QCOM_SMEM_HOST_ANY, MSM_ID_SMEM, &len);
> -	if (IS_ERR(msm_id))
> -		return NUM_OF_MSM8996_VERSIONS;
> -
> -	/* The first 4 bytes are format, next to them is the actual msm-id */
> -	msm_id++;
> -
> -	switch ((enum _msm_id)*msm_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;
> -}
> -
>  static int qcom_cpufreq_kryo_name_version(struct device *cpu_dev,
>  					  struct nvmem_cell *speedbin_nvmem,
>  					  char **pvs_name,
>  					  struct qcom_cpufreq_drv *drv)
>  {
>  	size_t len;
> +	u32 msm_id;
__le32

>  	u8 *speedbin;
> -	enum _msm8996_version msm8996_version;
> +	int ret;
>  	*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;
> -	}
> +	ret = qcom_smem_get_soc_id(&msm_id);
> +	if (ret)
> +		return ret;
Now since it can return a PTR_ERR, you should check for IS_ERR
and return ERR_PTR if that happens

LGTM otherwise!

Konrad
>  
>  	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: