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

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Date:   Sat, 18 Feb 2023 21:40:43 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     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 18.02.2023 21:36, Dmitry Baryshkov wrote:
> On Sat, 18 Feb 2023 at 16:43, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>>
>>
>> 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!
> 
> How? In my opinion newer drivers should use compat strings rather than
> depending on the SoC ID. If we were not bound with the compatibility
> for msm8996pro device trees already using higher bits, we could have
> dropped this part too.
Adreno speedbin-to-fuse mapping could use SoC detection..

Konrad
>