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

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Date:   Sat, 18 Feb 2023 22:36:07 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...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 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.

-- 
With best wishes
Dmitry